Pioglitazone Hydrochloride and Metformin Hydrochloride

Mylan Pharmaceuticals Inc.

HIGHLIGHTS OF PRESCRIBING INFORMATIONThese highlights do not include all the information needed to use pioglitazone and metformin hydrochloride tablets safely and effectively. See full prescribing information for pioglitazone and metformin hydrochloride tablets. PIOGLITAZONE and METFORMIN hydrochloride tablets, USP for oral use Initial U.S. Approval: 2005RECENT MAJOR CHANGESDosage and Administration     Recommendations for All Patients (2.1)     02/2012     Concomitant Use with an Insulin Secretagogue      or Insulin (2.2)     02/2012     Coadministration with Strong CYP2C8 Inhibitors (2.3)     02/2012Warnings and Precautions      Hepatic Effects (5.4)     02/2012     Urinary Bladder Tumors (5.6)     07/2011BOXED WARNINGWARNING: CONGESTIVE HEART FAILURE AND LACTIC ACIDOSIS See full prescribing information for complete boxed warning. Congestive Heart Failure • Thiazolidinediones, including pioglitazone, which is a component of pioglitazone and metformin hydrochloride tablets, cause or exacerbate congestive heart failure in some patients. (5.1) • After initiation of pioglitazone and metformin hydrochloride tablets, and after dose increases, monitor patients carefully for signs and symptoms of heart failure (e.g., excessive, rapid weight gain, dyspnea, and/or edema). If heart failure develops, it should be managed according to current standards of care and discontinuation or dose reduction of pioglitazone and metformin hydrochloride tablets must be considered. (5.1) • Pioglitazone and metformin hydrochloride tablets are not recommended in patients with symptomatic heart failure. • Initiation of pioglitazone and metformin hydrochloride tablets in patients with established New York Heart Association (NYHA) Class III or IV heart failure is contraindicated. (4, 5.1) Lactic Acidosis • Lactic acidosis can occur due to metformin accumulation. The risk increases with conditions such as sepsis, dehydration, excess alcohol intake, hepatic impairment, renal impairment, and acute congestive heart failure. (5.2) • Symptoms include malaise, myalgias, respiratory distress, increasing somnolence, and nonspecific abdominal distress. Laboratory abnormalities include low pH, increased anion gap, and elevated blood lactate. (5.2) • If acidosis is suspected, discontinue pioglitazone and metformin hydrochloride tablets and hospitalize the patient immediately. (5.2) INDICATIONS AND USAGEPioglitazone and metformin hydrochloride tablets are a thiazolidinedione and biguanide combination product indicated as an adjunct to diet and exercise to improve glycemic control in adults with type 2 diabetes mellitus when treatment with both pioglitazone and metformin is appropriate. (1, 14)Important Limitation of Use: •Not for treatment of type 1 diabetes or diabetic ketoacidosis. (1.2) DOSAGE AND ADMINISTRATION •Individualize the starting dose of pioglitazone and metformin hydrochloride tablets based on the patient’s current regimen. (2) •May adjust the dosing based on effectiveness and tolerability while not exceeding the maximum recommended daily dose of pioglitazone 45 mg and metformin 2550 mg. (2) •Maximum recommended dose of pioglitazone is 15 mg once daily in patients taking strong CYP2C8 inhibitors (e.g., gemfibrozil). (2.3, 7.1) •Pioglitazone and metformin hydrochloride tablets should be given in divided daily doses with meals to reduce the gastrointestinal (GI) side effects due to metformin. (2) •Dose increases should be accompanied by careful monitoring for adverse events related to fluid retention. (2) •Obtain liver tests before starting pioglitazone and metformin hydrochloride tablets. If abnormal, use caution when treating with pioglitazone and metformin hydrochloride tablets, investigate the probable cause, treat (if possible) and follow appropriately. Monitoring liver tests while on pioglitazone and metformin hydrochloride tablets is not recommended in patients without liver disease. (5.4) DOSAGE FORMS AND STRENGTHSTablets: 15 mg pioglitazone/500 mg metformin hydrochloride and 15 mg pioglitazone/850 mg metformin hydrochloride (3)CONTRAINDICATIONS •Do not initiate pioglitazone and metformin hydrochloride tablets in patients with established NYHA Class III or IV heart failure. (4) •Do not use in patients with a history of a serious hypersensitivity reaction to pioglitazone and metformin hydrochloride tablets or its ingredients. (4) •Renal impairment. •Metabolic acidosis, including diabetic ketoacidosis. (4, 5.2) WARNINGS AND PRECAUTIONS •Congestive heart failure: Fluid retention may occur and can exacerbate or lead to congestive heart failure. Combination use with insulin and use in congestive heart failure NYHA Class I and II may increase risk. Monitor patients for signs and symptoms. (5.1) •Edema: Dose related edema may occur. (5.3) •Lactic acidosis: Warn against excessive alcohol intake. Pioglitazone and metformin hydrochloride tablets are not recommended in hepatic impairment and are contraindicated in renal impairment. Ensure normal renal function before initiating and at least annually thereafter. (5.2) •Temporarily discontinue in patients undergoing radiologic studies with intravascular iodinated contrast materials or any surgical procedures necessitating restricted intake of food and fluids. (5.12) •Hepatic effects: Post-marketing reports of hepatic failure, sometimes fatal. Causality cannot be excluded. If liver injury is detected, promptly interrupt pioglitazone and metformin hydrochloride tablets and assess patient for probable cause, then treat cause if possible, to resolution or stabilization. Do not restart pioglitazone and metformin hydrochloride tablets if liver injury is confirmed and no alternate etiology can be found. (5.4) •Fractures: Increased incidence in female patients. Apply current standards of care for assessing and maintaining bone health. (5.5) •Bladder cancer: Preclinical and clinical data, and results from an observational study suggest an increased risk of bladder cancer in pioglitazone users. The observational data further suggest that the risk increases with duration of use. Do not use in patients with active bladder cancer. Use caution when using in patients with a prior history of bladder cancer. (5.6) •Hypoglycemia: When used with insulin or an insulin secretagogue, a lower dose of the insulin or insulin secretagogue may be needed to reduce the risk of hypoglycemia. (5.7) •Macular edema: Post-marketing reports. Recommend regular eye exams in all patients with diabetes according to current standards of care with prompt evaluation for acute visual changes. (5.8) •Vitamin B12 deficiency: Metformin may lower vitamin B12 levels. Monitor hematologic parameters annually. (5.14) •Macrovascular outcomes: There have been no clinical studies establishing conclusive evidence of macrovascular risk reduction with pioglitazone and metformin hydrochloride tablets or any other anti-diabetic drug. (5.15) Side EffectsMost common adverse reactions (> 5%) with pioglitazone and metformin hydrochloride tablets or pioglitazone and metformin coadministration include upper respiratory tract infection, edema, diarrhea, headache and weight gain. (6.1) To report SUSPECTED ADVERSE REACTIONS, contact Mylan Pharmaceuticals Inc. at 1-877-446-3679 (1-877-4-INFO-RX) or FDA at 1-800-FDA-1088, or www.fda.gov/medwatch. DRUG INTERACTIONS •Strong CYP2C8 inhibitors (e.g., gemfibrozil) increase pioglitazone concentrations. Limit pioglitazone and metformin hydrochloride tablets dose to 15 mg/850 mg daily. (2.3, 7.1) •CYP2C8 inducers (e.g., rifampin) may decrease pioglitazone concentrations. (7.2) •Cationic drugs: May reduce metformin elimination. Use with caution in patients who are taking cationic medications eliminated by renal tubular secretion. (7.4) USE IN SPECIFIC POPULATIONS •Nursing mothers: Discontinue drug or nursing, taking into consideration the importance of the drug to the mother. (8.3)

FULL PRESCRIBING INFORMATION: CONTENTS*

• WARNING: CONGESTIVE HEART FAILURE AND LACTIC ACIDOSIS
• 1 PIOGLITAZONE HYDROCHLORIDE AND METFORMIN HYDROCHLORIDE INDICATIONS AND USAGE
  • 1.2 Important Limitations of Use
• 2 PIOGLITAZONE HYDROCHLORIDE AND METFORMIN HYDROCHLORIDE DOSAGE AND ADMINISTRATION
  • 2.1 Recommendations for All Patients
  • 2.2 Concomitant Use with an Insulin Secretagogue or Insulin
  • 2.3 Coadministration with Strong CYP2C8 Inhibitors
• 3 DOSAGE FORMS AND STRENGTHS
• 4 PIOGLITAZONE HYDROCHLORIDE AND METFORMIN HYDROCHLORIDE CONTRAINDICATIONS
• 5 WARNINGS AND PRECAUTIONS
  • 5.1 Congestive Heart Failure
  • 5.2 Lactic Acidosis
  • 5.3 Edema
  • 5.4 Hepatic Effects
  • 5.5 Fractures
  • 5.6 Urinary Bladder Tumors
  • 5.7 Hypoglycemia
  • 5.8 Macular Edema
  • 5.9 Ovulation
  • 5.10 Monitoring of Renal Function
  • 5.11 Hypoxic States
  • 5.12 Surgical Procedures
  • 5.13 Alcohol Intake
  • 5.14 Vitamin B Levels
  • 5.15 Macrovascular Outcomes
• 6 PIOGLITAZONE HYDROCHLORIDE AND METFORMIN HYDROCHLORIDE ADVERSE REACTIONS
  • 6.1 Clinical Studies Experience
  • 6.2 Laboratory Abnormalities
  • 6.3 Post-Marketing Experience
• 7 DRUG INTERACTIONS
  • 7.1 Strong CYP2C8 Inhibitors
  • 7.2 CYP2C8 Inducers
  • 7.3 Carbonic Anhydrase Inhibitors
  • 7.4 Cationic Drugs
  • 7.5 Drugs Affecting Glycemic Control
• 8 USE IN SPECIFIC POPULATIONS
  • 8.1 Pregnancy
  • 8.2 Labor and Delivery
  • 8.3 Nursing Mothers
  • 8.4 Pediatric Use
  • 8.5 Geriatric Use
• 10 OVERDOSAGE
• 11 PIOGLITAZONE HYDROCHLORIDE AND METFORMIN HYDROCHLORIDE DESCRIPTION
• 12 CLINICAL PHARMACOLOGY
  • 12.1 Mechanism of Action
  • 12.2 Pharmacodynamics
  • 12.3 Pharmacokinetics
• 13 NONCLINICAL TOXICOLOGY
  • 13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility
  • 13.2 Animal Toxicology and/or Pharmacology
  • 13.3 Reproductive and Developmental Toxicology
• 14 CLINICAL STUDIES
  • 14.2 Patients Previously Treated with Metformin
• 16 HOW SUPPLIED/STORAGE AND HANDLING
• 17 PATIENT COUNSELING INFORMATION
  • 17.1 Instructions
  • 17.2 FDA-Approved Medication Guide

FULL PRESCRIBING INFORMATION

1 INDICATIONS AND USAGE

Pioglitazone and metformin hydrochloride tablets are indicated as an adjunct to diet and exercise to improve glycemic control in adults with type 2 diabetes mellitus when treatment with both pioglitazone and metformin is appropriate [see Clinical Studies (14)].

1.2 Important Limitations of Use

Pioglitazone exerts its antihyperglycemic effect only in the presence of endogenous insulin. Pioglitazone and metformin hydrochloride tablets should not be used to treat type 1 diabetes or diabetic ketoacidosis, as it would not be effective in these settings.

Use caution in patients with liver disease [see Warnings and Precautions (5.4)].

2 DOSAGE AND ADMINISTRATION

2.1 Recommendations for All Patients

Pioglitazone and metformin hydrochloride tablets should be taken with meals to reduce the gastrointestinal side effects associated with metformin.

If therapy with a combination tablet containing pioglitazone and metformin is considered appropriate the recommended starting dose is:

• • 15 mg/500 mg twice daily or 15 mg/850 mg once daily and gradually titrated, as needed, after assessing adequacy of therapeutic response and tolerability,
• • for patients with New York Heart Association (NYHA) Class I or Class II congestive heart failure: 15 mg/500 mg or 15 mg/850 mg once daily and gradually titrated, as needed, after assessing adequacy of therapeutic response and tolerability,
• • for patients inadequately controlled on metformin monotherapy: 15 mg/500 mg twice daily or 15 mg/850 mg once or twice daily (depending on the dose of metformin already being taken) and gradually titrated, as needed, after assessing adequacy of therapeutic response and tolerability,
• • for patients inadequately controlled on pioglitazone monotherapy: 15 mg/500 mg twice daily or 15 mg/850 mg once daily and gradually titrated, as needed, after assessing adequacy of therapeutic response and tolerability.
• • for patients who are changing from combination therapy of pioglitazone plus metformin as separate tablets: pioglitazone and metformin hydrochloride tablets should be taken at doses that are as close as possible to the dose of pioglitazone and metformin already being taken.

Pioglitazone and metformin hydrochloride tablets may be titrated up to a maximum daily dose of 45 mg of pioglitazone and 2550 mg of metformin.

Metformin doses above 2000 mg may be better tolerated given 3 times a day.

After initiation of pioglitazone and metformin hydrochloride tablets or with dose increase, monitor patients carefully for adverse reactions related to fluid retention such as weight gain, edema, and signs and symptoms of congestive heart failure [see Boxed Warning and Warnings and Precautions (5.1)]. Liver tests (serum alanine and aspartate aminotransferases, alkaline phosphatase, and total bilirubin) should be obtained prior to initiating pioglitazone and metformin hydrochloride tablets. Routine periodic monitoring of liver tests during treatment with pioglitazone and metformin hydrochloride tablets is not recommended in patients without liver disease. Patients who have liver test abnormalities prior to initiation of pioglitazone and metformin hydrochloride tablets or who are found to have abnormal liver tests while taking pioglitazone and metformin hydrochloride tablets should be managed as described under Warnings and Precautions [see Warnings and Precautions (5.4) and Clinical Pharmacology (12.3)].

2.2 Concomitant Use with an Insulin Secretagogue or Insulin

If hypoglycemia occurs in a patient coadministered pioglitazone and metformin hydrochloride tablets and an insulin secretagogue (e.g., sulfonylurea), the dose of the insulin secretagogue should be reduced.

If hypoglycemia occurs in a patient coadministered pioglitazone and metformin hydrochloride tablets and insulin, the dose of insulin should be decreased by 10% to 25%. Further adjustments to the insulin dose should be individualized based on glycemic response.

2.3 Coadministration with Strong CYP2C8 Inhibitors

Coadministration of pioglitazone (one of the ingredients in pioglitazone and metformin hydrochloride tablets) and gemfibrozil, a strong CYP2C8 inhibitor, increases pioglitazone exposure approximately 3-fold. Therefore, the maximum recommended dose of pioglitazone and metformin hydrochloride tablets is 15 mg/850 mg daily when used in combination with gemfibrozil or other strong CYP2C8 inhibitors [see Drug Interactions (7.1) and Clinical Pharmacology (12.3)].

3 DOSAGE FORMS AND STRENGTHS

• •Pioglitazone and metformin hydrochloride tablets 15 mg/500 mg are white to off-white film-coated, oval, unscored tablets debossed with MYLAN on one side of the tablet and P155 on the other side.
• •Pioglitazone and metformin hydrochloride tablets 15 mg/850 mg are white to off-white film-coated, oval, unscored tablets debossed with MYLAN on one side of the tablet and P157 on the other side.

4 CONTRAINDICATIONS

Do not initiate in patients with NYHA Class III or IV heart failure [see Boxed Warning]. In addition, pioglitazone and metformin hydrochloride tablets are contraindicated in patients with:

• •Renal impairment (e.g., serum creatinine levels ≥ 1.5 mg/dL [males], ≥ 1.4 mg/dL [females], or abnormal creatinine clearance) which may also result from conditions such as cardiovascular collapse (shock), acute myocardial infarction, and septicemia [see Warnings and Precautions (5.2, 5.10)].
• •Known hypersensitivity to pioglitazone, metformin or any other component of pioglitazone and metformin hydrochloride tablets.
• •Metabolic acidosis, including diabetic ketoacidosis. Diabetic ketoacidosis should be treated with insulin.

5 WARNINGS AND PRECAUTIONS

5.1 Congestive Heart Failure

Pioglitazone

Pioglitazone, like other thiazolidinediones, can cause dose related fluid retention when used alone or in combination with other antidiabetic medications and is most common when pioglitazone is used in combination with insulin. Fluid retention may lead to or exacerbate congestive heart failure. Patients treated with pioglitazone and metformin hydrochloride tablets should be observed for signs and symptoms of congestive heart failure. If congestive heart failure develops, it should be managed according to current standards of care and discontinuation or dose reduction of pioglitazone and metformin hydrochloride tablets must be considered [see Boxed Warning, Contraindications (4), and Adverse Reactions (6.1)].

5.2 Lactic Acidosis

Metformin Hydrochloride

Lactic acidosis is a serious, metabolic complication that can occur due to metformin accumulation during treatment with pioglitazone and metformin hydrochloride tablets and, it is fatal in approximately 50% of cases. Lactic acidosis may also occur in association with a number of pathophysiologic conditions, including diabetes mellitus, and whenever there is significant tissue hypoperfusion and hypoxemia. Lactic acidosis is characterized by elevated blood lactate concentrations (> 5 mmol/L), decreased blood pH, electrolyte disturbances with an increased anion gap, and an increased lactate/pyruvate ratio. When metformin is implicated as the cause of lactic acidosis, metformin plasma levels > 5 mcg/mL are generally found.

The reported incidence of lactic acidosis in patients receiving metformin hydrochloride is approximately 0.03 cases/1,000 patient-years, with approximately 0.015 fatal cases/1,000 patient-years. In more than 20,000 patient-years exposure to metformin in clinical trials, there were no reports of lactic acidosis. Reported cases have occurred primarily in diabetic patients with significant renal impairment, including both intrinsic renal disease and renal hypoperfusion, often in the setting of multiple concomitant medical/surgical problems and multiple concomitant medications. Patients with congestive heart failure requiring pharmacologic management, particularly when accompanied by hypoperfusion and hypoxemia, are at increased risk of lactic acidosis. The risk of lactic acidosis increases with the degree of renal dysfunction and the patient's age. The risk of lactic acidosis may, therefore, be significantly decreased by regular monitoring of renal function in patients taking metformin. In particular, treatment of the elderly should be accompanied by careful monitoring of renal function. Pioglitazone and metformin hydrochloride tablets treatment should not be initiated in any patient unless measurement of creatinine clearance demonstrates that renal function is not reduced. In addition, metformin should be promptly withheld in the presence of any condition associated with hypoxemia, dehydration, or sepsis. Because impaired hepatic function may significantly limit the ability to clear lactate, metformin should generally be avoided in patients with clinical or laboratory evidence of hepatic impairment. Patients should be cautioned against excessive alcohol intake when taking metformin, because alcohol potentiates the effects of metformin on lactate metabolism. In addition, metformin should be temporarily discontinued prior to any intravascular radiocontrast study and for any surgical procedure necessitating restricted intake of food or fluids [see Warnings and Precautions (5.10, 5.11, 5.12, 5.13)]. Use of topiramate, a carbonic anhydrase inhibitor, in epilepsy and migraine prophylaxis may frequently cause dose-dependent metabolic acidosis and may exacerbate the risk of metformin-induced lactic acidosis [see Drug Interactions (7.1) and Clinical Pharmacology (12.3)].

The onset of lactic acidosis often is subtle, and accompanied only by nonspecific symptoms such as malaise, myalgias, respiratory distress, increasing somnolence, and nonspecific abdominal distress. There may be associated hypothermia, hypotension, and resistant bradyarrhythmias with more marked acidosis. Patients should be educated to promptly report these symptoms should they occur. If present, pioglitazone and metformin hydrochloride tablets should be withdrawn until lactic acidosis is ruled out. Serum electrolytes, ketones, blood glucose, blood pH, lactate levels, and blood metformin levels may be useful. Once a patient is stabilized on any dose level of metformin, gastrointestinal symptoms, which are common during initiation of therapy, are unlikely to recur. Later occurrence of gastrointestinal symptoms could be due to lactic acidosis or other serious disease.

Levels of fasting venous plasma lactate above the upper limit of normal but less than 5 mmol/L in patients taking metformin do not necessarily indicate impending lactic acidosis and may be explainable by other mechanisms, such as poorly controlled diabetes or obesity, vigorous physical activity, or technical problems in sample handling [see Warnings and Precautions (5.10)].

Lactic acidosis should be suspected in any diabetic patient with metabolic acidosis lacking evidence of ketoacidosis (ketonuria and ketonemia).

Lactic acidosis is a medical emergency that must be treated in a hospital setting. In a patient with lactic acidosis who is taking metformin, the drug should be discontinued immediately and general supportive measures promptly instituted. Because metformin hydrochloride is dialyzable (with a clearance of up to 170 mL/min under good hemodynamic conditions), prompt hemodialysis is recommended to correct the acidosis and remove the accumulated metformin. Such management often results in prompt reversal of symptoms and recovery [see Contraindications (4) and Warnings and Precautions (5.10)].

5.3 Edema

In controlled clinical trials with pioglitazone, edema was reported more frequently in patients treated with pioglitazone than in placebo-treated patients and is dose related [see Adverse Reactions (6.1)]. In post-marketing experience, reports of new onset or worsening of edema have been received.

Pioglitazone and metformin hydrochloride tablets should be used with caution in patients with edema. Because thiazolidinediones, including pioglitazone, can cause fluid retention, which can exacerbate or lead to congestive heart failure, pioglitazone and metformin hydrochloride tablets should be used with caution in patients at risk for congestive heart failure. Patients treated with pioglitazone and metformin hydrochloride tablets should be monitored for signs and symptoms of congestive heart failure [see Boxed Warning, Warnings and Precautions (5.1), and Patient Counseling Information (17.1)].

5.4 Hepatic Effects

There have been post-marketing reports of fatal and nonfatal hepatic failure in patients taking pioglitazone, although the reports contain insufficient information necessary to establish the probable cause. There has been no evidence of drug-induced hepatotoxicity in the pioglitazone controlled clinical trial database to date [see Adverse Reactions (6.1)].

Patients with type 2 diabetes may have fatty liver disease or cardiac disease with episodic congestive heart failure, both of which may cause liver test abnormalities, and they may also have other forms of liver disease, many of which can be treated or managed. Therefore, obtaining a liver test panel (serum alanine aminotransferase [ALT], aspartate aminotransferase [AST], alkaline phosphatase, and total bilirubin) and assessing the patient is recommended before initiating pioglitazone and metformin hydrochloride tablets therapy.

In patients with abnormal liver tests, pioglitazone and metformin hydrochloride tablets should be initiated with caution.

Measure liver tests promptly in patients who report symptoms that may indicate liver injury, including fatigue, anorexia, right upper abdominal discomfort, dark urine or jaundice. In this clinical context, if the patient is found to have abnormal liver tests (ALT greater than three times the upper limit of the reference range), pioglitazone and metformin hydrochloride tablets treatment should be interrupted and investigation done to establish the probable cause. Pioglitazone and metformin hydrochloride tablets should not be restarted in these patients without another explanation for the liver test abnormalities.

Patients who have serum ALT greater than three times the reference range with serum total bilirubin greater than two times the reference range without alternative etiologies are at risk for severe drug-induced liver injury, and should not be restarted on pioglitazone and metformin hydrochloride tablets. For patients with lesser elevations of serum ALT or bilirubin and with an alternate probable cause, treatment with pioglitazone and metformin hydrochloride tablets can be used with caution.

Because impaired hepatic function has been associated with some cases of lactic acidosis pioglitazone and metformin hydrochloride tablets should generally be avoided in patients with clinical or laboratory evidence of hepatic disease.

5.5 Fractures

In PROactive (the Prospective Pioglitazone Clinical Trial in Macrovascular Events), 5,238 patients with type 2 diabetes and a history of macrovascular disease were randomized to pioglitazone (N = 2,605), force-titrated up to 45 mg daily or placebo (N = 2,633) in addition to standard of care. During a mean follow-up of 34.5 months, the incidence of bone fracture in females was 5.1% (44/870) for pioglitazone versus 2.5% (23/905) for placebo. This difference was noted after the first year of treatment and persisted during the course of the study. The majority of fractures observed in female patients were nonvertebral fractures including lower limb and distal upper limb. No increase in the incidence of fracture was observed in men treated with pioglitazone (1.7%) versus placebo (2.1%). The risk of fracture should be considered in the care of patients, especially female patients, treated with pioglitazone and metformin hydrochloride tablets and attention should be given to assessing and maintaining bone health according to current standards of care.

5.6 Urinary Bladder Tumors

Tumors were observed in the urinary bladder of male rats in the 2-year carcinogenicity study [see Nonclinical Toxicology (13.1)]. In two 3-year trials in which pioglitazone was compared to placebo or glyburide, there were 16/3656 (0.44%) reports of bladder cancer in patients taking pioglitazone compared to 5/3679 (0.14%) in patients not taking pioglitazone. After excluding patients in whom exposure to study drug was less than one year at the time of diagnosis of bladder cancer, there were six (0.16%) cases on pioglitazone and two (0.05%) cases on placebo. A 5-year interim report of an ongoing 10-year observational cohort study found a non-significant increase in the risk for bladder cancer in subjects ever exposed to pioglitazone, compared to subjects never exposed to pioglitazone (HR 1.2 [95% CI 0.9 – 1.5]). Compared to never exposure, a duration of pioglitazone therapy longer than 12 months was associated with an increase in risk (HR 1.4 [95% CI 0.9 – 2.1]), which reached statistical significance after more than 24 months of pioglitazone use (HR 1.4 [95% CI 1.03 – 2]). Interim results from this study suggested that taking pioglitazone longer than 12 months increased the relative risk of developing bladder cancer in any given year by 40% which equates to an absolute increase of three cases in 10,000 (from approximately seven in 10,000 [without pioglitazone] to approximately ten in 10,000 [with pioglitazone]).

There are insufficient data to determine whether pioglitazone is a tumor promoter for urinary bladder tumors. Consequently, pioglitazone and metformin hydrochloride tablets should not be used in patients with active bladder cancer and the benefits of glycemic control versus unknown risks for cancer recurrence with pioglitazone and metformin hydrochloride tablets should be considered in patients with a prior history of bladder cancer.

5.7 Hypoglycemia

Patients receiving pioglitazone and metformin hydrochloride tablets in combination with insulin or other anti-diabetic medications (particularly insulin secretagogues such as sulfonylureas) may be at risk for hypoglycemia. A reduction in the dose of the concomitant anti-diabetic medication may be necessary to reduce the risk of hypoglycemia [see Dosage and Administration (2.2)].

Hypoglycemia can also occur when caloric intake is deficient or when strenuous exercise is not compensated by caloric supplement. Elderly, debilitated, or malnourished patients, and those with adrenal or pituitary insufficiency or alcohol intoxication are particularly susceptible to hypoglycemic effects. Hypoglycemia may be difficult to recognize in the elderly, and in people who are taking beta-adrenergic blocking drugs.

5.8 Macular Edema

Macular edema has been reported in post-marketing experience in diabetic patients who were taking pioglitazone or another thiazolidinedione. Some patients presented with blurred vision or decreased visual acuity, but others were diagnosed on routine ophthalmologic examination. Most patients had peripheral edema at the time macular edema was diagnosed. Some patients had improvement in their macular edema after discontinuation of the thiazolidinedione.

Patients with diabetes should have regular eye exams by an ophthalmologist according to current standards of care. Patients with diabetes who report any visual symptoms should be promptly referred to an ophthalmologist, regardless of the patient's underlying medications or other physical findings [see Adverse Reactions (6.1)].

5.9 Ovulation

Therapy with pioglitazone, like other thiazolidinediones, may result in ovulation in some premenopausal anovulatory women. As a result, these patients may be at an increased risk for pregnancy while taking pioglitazone and metformin hydrochloride tablets [see Use in Specific Populations (8.1)]. This effect has not been investigated in clinical trials, so the frequency of this occurrence is not known. Adequate contraception in all premenopausal women treated with pioglitazone and metformin hydrochloride tablets is recommended.

5.10 Monitoring of Renal Function

Metformin is substantially excreted by the kidney, and the risk of metformin accumulation and lactic acidosis increases with the degree of impairment of renal function. Therefore, pioglitazone and metformin hydrochloride tablets are contraindicated in patients with renal impairment.

Before initiation of therapy with pioglitazone and metformin hydrochloride tablets and at least annually thereafter, renal function should be assessed and verified as normal. In patients in whom development of renal dysfunction is anticipated (e.g., elderly), renal function should be assessed more frequently and pioglitazone and metformin hydrochloride tablets discontinued if evidence of renal impairment is present.

Use of Concomitant Medications that May Affect Renal Function or Metformin Disposition

Concomitant medication(s) that may affect renal function or result in significant hemodynamic change or may interfere with the disposition of metformin, such as cationic drugs that are eliminated by renal tubular secretion, should be used with caution [see Clinical Pharmacology (12.3)].

Radiological Studies and Surgical Procedures

Radiologic studies involving the use of intravascular iodinated contrast materials (for example, intravenous urogram, intravenous cholangiography, angiography, and computed tomography (CT) scans with intravascular contrast materials) can lead to acute alteration of renal function and have been associated with lactic acidosis in patients receiving metformin [see Contraindications (4)]. Therefore, in patients in whom any such study is planned, pioglitazone and metformin hydrochloride tablets should be discontinued at the time of or prior to the procedure, and withheld for 48 hours subsequent to the procedure and reinstituted only after renal function has been re-evaluated and found to be normal.

5.11 Hypoxic States

Cardiovascular collapse (shock) from whatever cause, acute congestive heart failure, acute myocardial infarction and other conditions characterized by hypoxemia have been associated with lactic acidosis and may also cause prerenal azotemia. When such events occur in patients receiving pioglitazone and metformin hydrochloride tablets therapy, the drug should be promptly discontinued.

5.12 Surgical Procedures

Use of pioglitazone and metformin hydrochloride tablets should be temporarily suspended for any surgical procedure (except minor procedures not associated with restricted intake of food and fluids) and should not be restarted until the patient's oral intake has resumed and renal function has been evaluated as normal.

5.13 Alcohol Intake

Alcohol is known to potentiate the effect of metformin on lactate metabolism. Patients, therefore, should be warned against excessive alcohol intake, acute or chronic, while receiving pioglitazone and metformin hydrochloride tablets.

5.14 Vitamin B Levels

In controlled clinical trials of metformin of 29 weeks duration, a decrease to subnormal levels of previously normal serum vitamin B₁₂ levels, without clinical manifestations, was observed in approximately 7% of patients. Such decrease, possibly due to interference with B₁₂ absorption from the B₁₂ -intrinsic factor complex, is, however, very rarely associated with anemia and appears to be rapidly reversible with discontinuation of metformin or vitamin B₁₂ supplementation. Measurement of hematologic parameters on an annual basis is advised in patients on pioglitazone and metformin hydrochloride tablets and any apparent abnormalities should be appropriately investigated and managed. Certain individuals (those with inadequate vitamin B₁₂ or calcium intake or absorption) appear to be predisposed to developing subnormal vitamin B₁₂ levels. In these patients, routine serum vitamin B₁₂ measurements at 2- to 3-year intervals may be useful.

5.15 Macrovascular Outcomes

There have been no clinical studies establishing conclusive evidence of macrovascular risk reduction with pioglitazone and metformin hydrochloride tablets or any other oral anti-diabetic drug.

6 ADVERSE REACTIONS

The following serious adverse reactions are discussed elsewhere in the labeling:

• •Congestive heart failure [see Boxed Warning and Warnings and Precautions (5.1)]
• •Lactic acidosis [see Boxed Warning and Warnings and Precautions (5.2)]
• •Edema [see Warnings and Precautions (5.3)]
• •Fractures [see Warnings and Precautions (5.5)]

6.1 Clinical Studies Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

Pioglitazone

Over 8,500 patients with type 2 diabetes have been treated with pioglitazone in randomized, double-blind, controlled clinical trials, including 2,605 patients with type 2 diabetes and macrovascular disease treated with pioglitazone from the PROactive clinical trial. In these trials, over 6,000 patients have been treated with pioglitazone for 6 months or longer, over 4,500 patients have been treated with pioglitazone for one year or longer, and over 3,000 patients have been treated with pioglitazone for at least 2 years.

In six pooled 16- to 26-week placebo-controlled monotherapy and 16- to 24-week add-on combination therapy trials, the incidence of withdrawals due to adverse events was 4.5% for patients treated with pioglitazone and 5.8% for comparator-treated patients. The most common adverse events leading to withdrawal were related to inadequate glycemic control, although the incidence of these events was lower (1.5%) with pioglitazone than with placebo (3%).

In the PROactive trial, the incidence of withdrawals due to adverse events was 9% for patients treated with pioglitazone and 7.7% for placebo-treated patients. Congestive heart failure was the most common serious adverse event leading to withdrawal occurring in 1.3% of patients treated with pioglitazone and 0.6% of patients treated with placebo.

Common Adverse Events: 16- to 26-Week Monotherapy Trials

A summary of the incidence and type of common adverse events reported in three pooled 16- to 26-week placebo-controlled monotherapy trials of pioglitazone is provided in Table 1. Terms that are reported represent those that occurred at an incidence of > 5% and more commonly in patients treated with pioglitazone than in patients who received placebo. None of these adverse events were related to the pioglitazone dose.

Common Adverse Events: 16- to 24-Week Add-on Combination Therapy Trials

A summary of the overall incidence and types of common adverse events reported in trials of pioglitazone add-on to metformin is provided in Table 2. Terms that are reported represent those that occurred at an incidence of > 5% and more commonly with the highest tested dose of pioglitazone.

Common Adverse Events: 24-Week Pioglitazone and Metformin Hydrochloride Tablets Clinical Trial

Table 3 summarizes the incidence and types of adverse reactions reported in a controlled, 24-week double-blind clinical trial of pioglitazone and metformin hydrochloride tablets dosed twice daily in patients with inadequate glycemic control on diet and exercise (N = 600).

In this 24-week trial, abdominal pain was reported in 2% of patients in the pioglitazone and metformin hydrochloride tablets group, 1.6% in the pioglitazone monotherapy group and 3.3% in the metformin monotherapy group.

Common Adverse Events: PROactive Trial

A summary of the overall incidence and types of common adverse events reported in the PROactive trial is provided in Table 4. Terms that are reported represent those that occurred at an incidence of > 5% and more commonly in patients treated with pioglitazone than in patients who received placebo.

Mean duration of patient follow-up was 34.5 months.

Congestive Heart Failure

A summary of the incidence of adverse events related to congestive heart failure is provided in Table 5 for the 16- to 24-week add-on to metformin trials. None of the events were fatal.

Congestive heart failure events leading to hospitalization that occurred during the PROactive trial are summarized in Table 8.

Cardiovascular Safety

In the PROactive trial, 5,238 patients with type 2 diabetes and a history of macrovascular disease were randomized to pioglitazone (N = 2,605), force-titrated up to 45 mg daily or placebo (N = 2,633) in addition to standard of care. Almost all patients (95%) were receiving cardiovascular medications (beta blockers, ACE inhibitors, angiotensin II receptor blockers, calcium channel blockers, nitrates, diuretics, aspirin, statins and fibrates). At baseline, patients had a mean age of 62 years, mean duration of diabetes of 9.5 years, and mean HbA1c of 8.1%. Mean duration of follow-up was 34.5 months.

The primary objective of this trial was to examine the effect of pioglitazone on mortality and macrovascular morbidity in patients with type 2 diabetes mellitus who were at high risk for macrovascular events. The primary efficacy variable was the time to the first occurrence of any event in a cardiovascular composite endpoint that included all-cause mortality, nonfatal myocardial infarction (MI) including silent MI, stroke, acute coronary syndrome, cardiac intervention including coronary artery bypass grafting or percutaneous intervention, major leg amputation above the ankle, and bypass surgery or revascularization in the leg. A total of 514 (19.7%) patients treated with pioglitazone and 572 (21.7%) placebo-treated patients experienced at least one event from the primary composite endpoint (hazard ratio 0.90; 95% Confidence Interval: 0.80, 1.02; p=0.10).

Although there was no statistically significant difference between pioglitazone and placebo for the 3-year incidence of a first event within this composite, there was no increase in mortality or in total macrovascular events with pioglitazone. The number of first occurrences and total individual events contributing to the primary composite endpoint is shown in Table 9.

Weight Gain

Dose related weight gain occurs when pioglitazone is used alone or in combination with other anti-diabetic medications. The mechanism of weight gain is unclear but probably involves a combination of fluid retention and fat accumulation.

Tables 10, 11 and 12 summarize the changes in body weight with pioglitazone and

placebo in the 16- to 26-week randomized, double-blind monotherapy and 16- to 24-week combination add-on therapy trials, the PROactive trial, and the 24-week

pioglitazone and metformin hydrochloride tablets trial.

Edema

Edema induced from taking pioglitazone is reversible when pioglitazone is discontinued. The edema usually does not require hospitalization unless there is coexisting congestive heart failure.

In the 24-week pioglitazone and metformin hydrochloride tablets trial, edema was reported in 3% of patients in the pioglitazone and metformin hydrochloride tablets group, 4.2% in the pioglitazone monotherapy group and 1.4% in the metformin monotherapy group.

A summary of the frequency and types of edema adverse events occurring in clinical investigations of pioglitazone is provided in Table 13.

Hepatic Effects

There has been no evidence of pioglitazone-induced hepatotoxicity in the pioglitazone controlled clinical trial database to date. One randomized, double-blind, 3-year trial comparing pioglitazone to glyburide as add-on to metformin and insulin therapy was specifically designed to evaluate the incidence of serum ALT elevation to greater than three times the upper limit of the reference range, measured every 8 weeks for the first 48 weeks of the trial then every 12 weeks thereafter. A total of 3/1,051 (0.3%) patients treated with pioglitazone and 9/1,046 (0.9%) patients treated with glyburide developed ALT values > three times the upper limit of the reference range. None of the patients treated with pioglitazone in the pioglitazone controlled clinical trial database to date have had a serum ALT > three times the upper limit of the reference range and a corresponding total bilirubin > two times the upper limit of the reference range, a combination predictive of the potential for severe drug-induced liver injury.

Hypoglycemia

In the pioglitazone clinical trials, adverse events of hypoglycemia were reported based on clinical judgment of the investigators and did not require confirmation with fingerstick glucose testing.

In the 16-week add-on to sulfonylurea trial, the incidence of reported hypoglycemia was 3.7% with pioglitazone 30 mg and 0.5% with placebo. In the 16-week add-on to insulin trial, the incidence of reported hypoglycemia was 7.9% with pioglitazone 15 mg, 15.4% with pioglitazone 30 mg, and 4.8% with placebo.

The incidence of reported hypoglycemia was higher with pioglitazone 45 mg compared to pioglitazone 30 mg in both the 24-week add-on to sulfonylurea trial (15.7% vs. 13.4%) and in the 24-week add-on to insulin trial (47.8% vs. 43.5%).

Three patients in these four trials were hospitalized due to hypoglycemia. All three patients were receiving pioglitazone 30 mg (0.9%) in the 24-week add-on to insulin trial. An additional 14 patients reported severe hypoglycemia (defined as causing considerable interference with patient’s usual activities) that did not require hospitalization. These patients were receiving pioglitazone 45 mg in combination with sulfonylurea (n = 2) or pioglitazone 30 mg or 45 mg in combination with insulin (n = 12).

Urinary Bladder Tumors

Tumors were observed in the urinary bladder of male rats in the 2-year carcinogenicity study [see Nonclinical Toxicology (13.1)]. In two 3-year trials in which pioglitazone was compared to placebo or glyburide, there were 16/3,656 (0.44%) reports of bladder cancer in patients taking pioglitazone compared to 5/3,679 (0.14%) in patients not taking pioglitazone. After excluding patients in whom exposure to study drug was less than one year at the time of diagnosis of bladder cancer, there were six (0.16%) cases on pioglitazone and two (0.05%) cases on placebo. There are too few events of bladder cancer to establish causality.

Metformin Hydrochloride

In a double-blind clinical study of metformin in patients with type 2 diabetes, a total of 141 patients received metformin therapy (up to 2550 mg per day) and 145 patients received placebo. Adverse reactions reported in greater than 5% of the metformin patients, and that were more common in metformin than placebo-treated patients, are listed in Table 15. In this trial, diarrhea led to discontinuation of study medication in 6% of patients treated with metformin.

Table 15: Most Common Adverse Reactions (> 5%) in a Placebo-Controlled Clinical Study of Metformin MonotherapyReactions that were more common in metformin than placebo-treated patients.

Adverse Reaction	Metformin Monotherapy (n = 141)	Placebo (n = 145)
	% of Patients
Diarrhea	53.2	11.7
Nausea/Vomiting	25.5	8.3
Flatulence	12.1	5.5
Asthenia	9.2	5.5
Indigestion	7.1	4.1
Abdominal Discomfort	6.4	4.8
Headache	5.7	4.8

6.2 Laboratory Abnormalities

Hematologic Effects

Pioglitazone may cause decreases in hemoglobin and hematocrit. In placebo-controlled monotherapy trials, mean hemoglobin values declined by 2% to 4% in patients treated with pioglitazone compared with a mean change in hemoglobin of -1% to +1% in placebo-treated patients. These changes primarily occurred within the first 4 to 12 weeks of therapy and remained relatively constant thereafter. These changes may be related to increased plasma volume associated with pioglitazone therapy and are not likely to be associated with any clinically significant hematologic effects.

Vitamin B Concentrations

Metformin may lower serum vitamin B₁₂ concentrations. Measurement of hematologic parameters on an annual basis is advised in patients on pioglitazone and metformin hydrochloride tablets and any apparent abnormalities should be appropriately investigated and managed [see Warnings and Precautions (5.14)].

Creatine Phosphokinase

During protocol-specified measurement of serum creatine phosphokinase (CPK) in pioglitazone clinical trials, an isolated elevation in CPK to greater than 10 times the upper limit of the reference range was noted in 9 (0.2%) patients treated with pioglitazone (values of 2150 to 11400 IU/L) and in no comparator-treated patients. Six of these nine patients continued to receive pioglitazone, two patients were noted to have the CPK elevation on the last day of dosing, and one patient discontinued pioglitazone due to the elevation. These elevations resolved without any apparent clinical sequelae. The relationship of these events to pioglitazone therapy is unknown.

6.3 Post-Marketing Experience

Pioglitazone

The following adverse reactions have been identified during post-approval use of pioglitazone. Because these reactions are reported voluntarily from a population of uncertain size, it is generally not possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

• •New onset or worsening diabetic macular edema with decreased visual acuity [see Warnings and Precautions (5.8)].
• •Fatal and nonfatal hepatic failure [see Warnings and Precautions (5.4)].

Post-marketing reports of congestive heart failure have been reported in patients treated with pioglitazone, both with and without previously known heart disease and both with and without concomitant insulin administration.

In post-marketing experience, there have been reports of unusually rapid increases in weight and increases in excess of that generally observed in clinical trials. Patients who experience such increases should be assessed for fluid accumulation and volume-related events such as excessive edema and congestive heart failure [see Boxed Warning and Warnings and Precautions (5.1)].

7 DRUG INTERACTIONS

7.1 Strong CYP2C8 Inhibitors

An inhibitor of CYP2C8 (e.g., gemfibrozil) significantly increases the exposure (area under the serum concentration-time curve or AUC) and half-life of pioglitazone. Therefore, the maximum recommended dose of pioglitazone is 15 mg daily if used in combination with gemfibrozil or other strong CYP2C8 inhibitors [see Dosage and Administration (2.3) and Clinical Pharmacology (12.3)].

7.2 CYP2C8 Inducers

An inducer of CYP2C8 (e.g., rifampin) may significantly decrease the exposure (AUC) of pioglitazone. Therefore, if an inducer of CYP2C8 is started or stopped during treatment with pioglitazone, changes in diabetes treatment may be needed based on clinical response without exceeding the maximum recommended daily dose of 45 mg for pioglitazone [see Clinical Pharmacology (12.3)].

7.3 Carbonic Anhydrase Inhibitors

Topiramate or other carbonic anhydrase inhibitors (e.g., zonisamide, acetazolamide or dichlorphenamide) frequently decrease serum bicarbonate and induce non-anion gap, hyperchloremic metabolic acidosis. Concomitant use of these drugs may induce metabolic acidosis. Use these drugs with caution in patients treated with metformin, as the risk of lactic acidosis may increase.

7.4 Cationic Drugs

Cationic drugs (e.g., amiloride, digoxin, morphine, procainamide, quinidine, quinine, ranitidine, triamterene, trimethoprim, or vancomycin) that are eliminated by renal tubular secretion theoretically have the potential for interaction with metformin by competing for common renal tubular transport systems. Although such interactions remain theoretical (except for cimetidine), careful patient monitoring and dose adjustment of pioglitazone and metformin hydrochloride tablets and/or the interfering drug is recommended in patients who are taking cationic medications that are excreted via the proximal renal tubular secretory system [see Clinical Pharmacology (12.3)].

7.5 Drugs Affecting Glycemic Control

Certain drugs tend to produce hyperglycemia and may lead to loss of glycemic control. These drugs include the thiazides and other diuretics, corticosteroids, phenothiazines, thyroid products, estrogens, oral contraceptives, phenytoin, nicotinic acid, sympathomimetics, calcium channel blockers, and isoniazid. When such drugs are administered to a patient receiving pioglitazone and metformin hydrochloride tablets, the patient should be closely observed for loss of blood glucose control. When such drugs are withdrawn from a patient receiving pioglitazone and metformin hydrochloride tablets, the patient should be observed closely for hypoglycemia.

8 USE IN SPECIFIC POPULATIONS

8.1 Pregnancy

Teratogenic Effects. Pregnancy Category C

There are no adequate and well controlled studies of pioglitazone and metformin hydrochloride tablets or its individual components in pregnant women. Animal studies using pioglitazone show increased rates of postimplantation loss, delayed development, reduced fetal weights, and delayed parturition at doses 10 to 40 times the maximum recommended human dose. Pioglitazone and metformin hydrochloride tablets should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Pioglitazone

Abnormal blood glucose concentrations during pregnancy are associated with a higher incidence of congenital anomalies, as well as increased neonatal morbidity and mortality. Most experts recommend the use of insulin during pregnancy to maintain blood glucose concentrations as close to normal as possible for patients with diabetes.

In animal reproductive studies, pregnant rats and rabbits received pioglitazone at doses up to approximately 17 (rat) and 40 (rabbit) times the maximum recommended human oral dose (MRHD) based on body surface area (mg/m²); no teratogenicity was observed [see Nonclinical Toxicology (13.3)]. Increases in embryotoxicity (increased postimplantation losses, delayed development, reduced fetal weights, and delayed parturition) occurred in rats that received oral doses approximately 10 or more times the MRHD (mg/m² basis). No functional or behavioral toxicity was observed in rat offspring. When pregnant rats received pioglitazone during late gestation and lactation, delayed postnatal development, attributed to decreased body weight, occurred in rat offspring at oral maternal doses approximately 2 or more times the MRHD (mg/m² basis). In rabbits, embryotoxicity occurred at oral doses approximately 40 times the MRHD (mg/m² basis).

Metformin Hydrochloride

Metformin was not teratogenic in rats and rabbits at doses up to 600 mg/kg/day. This represents an exposure of about two and six times a human daily dose of 2000 mg based on body surface area comparisons for rats and rabbits, respectively. However, because animal reproduction studies are not always predictive of human response, metformin should not be used during pregnancy unless clearly needed.

8.2 Labor and Delivery

The effect of pioglitazone and metformin hydrochloride tablets on labor and delivery in humans is not known.

8.3 Nursing Mothers

No studies have been conducted with the combined components of pioglitazone and metformin hydrochloride tablets. In studies performed with the individual components, both pioglitazone and metformin are secreted in the milk of lactating rats. It is not known whether pioglitazone and/or metformin are secreted in human milk. Because many drugs are excreted in human milk, and because of the potential for pioglitazone and metformin hydrochloride tablets to cause serious adverse reactions in nursing infants, a decision should be made to discontinue nursing or discontinue pioglitazone and metformin hydrochloride tablets, taking into account the importance of pioglitazone and metformin hydrochloride tablets to the mother.

8.4 Pediatric Use

Safety and effectiveness of pioglitazone and metformin hydrochloride tablets in pediatric patients have not been established.

Pioglitazone and metformin hydrochloride tablets are not recommended for the treatment of diabetes in pediatric patients based on adverse effects observed with pioglitazone in adults, including fluid retention and congestive heart failure, fractures, and urinary bladder tumors [see Warnings and Precautions (5.1, 5.2, 5.5, 5.6)].

8.5 Geriatric Use

Pioglitazone

A total of 92 patients (15.2%) treated with pioglitazone in the three pooled 16- to 26-week double-blind, placebo-controlled, monotherapy, trials were ≥ 65 years old and two patients (0.3%) were ≥ 75 years old. In the two pooled 16- to 24-week add-on to sulfonylurea trials, 201 patients (18.7%) treated with pioglitazone were ≥ 65 years old and 19 (1.8%) were ≥ 75 years old. In the two pooled 16- to 24-week add-on to metformin trials, 155 patients (15.5%) treated with pioglitazone were ≥ 65 years old and 19 (1.9%) were ≥ 75 years old. In the two pooled 16- to 24- week add-on to insulin trials, 272 patients (25.4%) treated with pioglitazone were ≥ 65 years old and 22 (2.1%) were ≥ 75 years old.

In PROactive, 1,068 patients (41%) treated with pioglitazone were ≥ 65 years old and 42 (1.6%) were ≥ 75 years old.

In pharmacokinetic studies with pioglitazone, no significant differences were observed in pharmacokinetic parameters between elderly and younger patients. These clinical experiences have not identified differences in effectiveness and safety between the elderly (≥ 65 years) and younger patients although small sample sizes for patients ≥ 75 years old limit conclusions [see Clinical Pharmacology (12.3)].

Metformin Hydrochloride

Controlled clinical studies of metformin did not include sufficient numbers of elderly patients to determine whether they respond differently from younger patients, although other reported clinical experience has not identified differences in responses between the elderly and young patients. Metformin is known to be substantially excreted by the kidney and because the risk of serious adverse reactions to the drug is greater in patients with impaired renal function, pioglitazone and metformin hydrochloride tablets should only be used in patients with normal renal function [see Contraindications (4), Warnings and Precautions (5.2) and Clinical Pharmacology (12.3)]. Because aging is associated with reduced renal function, pioglitazone and metformin hydrochloride tablets should be used with caution as age increases. Care should be taken in dose selection and should be based on careful and regular monitoring of renal function. Generally, elderly patients should not be titrated to the maximum dose of pioglitazone and metformin hydrochloride tablets [see Warnings and Precautions (5.2) and Dosage and Administration (2)].

10 OVERDOSAGE

Pioglitazone: During controlled clinical trials, one case of overdose with pioglitazone was reported. A male patient took 120 mg per day for four days, then 180 mg per day for seven days. The patient denied any clinical symptoms during this period.

In the event of overdosage, appropriate supportive treatment should be initiated according to the patient’s clinical signs and symptoms.

Metformin Hydrochloride: Overdose of metformin hydrochloride has occurred, including ingestion of amounts greater than 50 grams. Hypoglycemia was reported in approximately 10% of cases, but no causal association with metformin hydrochloride has been established. Lactic acidosis has been reported in approximately 32% of metformin overdose cases [see Warnings and Precautions (5.2)]. Metformin is dialyzable with a clearance of up to 170 mL/min under good hemodynamic conditions. Therefore, hemodialysis may be useful for removal of accumulated metformin from patients in whom metformin overdosage is suspected.

11 DESCRIPTION

Pioglitazone and metformin hydrochloride tablets, USP contain two oral antidiabetic medications used in the management of type 2 diabetes: pioglitazone hydrochloride and metformin hydrochloride.

Pioglitazone [(±)-5-[[4-[2-(5-ethyl-2-pyridinyl)ethoxy]phenyl]methyl]-2,4-] thiazolidinedione monohydrochloride contains one asymmetric carbon, and the compound is synthesized and used as the racemic mixture. The two enantiomers of pioglitazone interconvert in vivo. No differences were found in the pharmacologic activity between the two enantiomers. The structural formula is as shown:

Pioglitazone hydrochloride, USP is a white to off-white crystalline powder that has a molecular formula of C₁₉H₂₀N₂O₃S•HCl and a molecular weight of 392.9. It is soluble in dimethylformamide and anhydrous ethanol, very slightly soluble in acetone and acetonitrile, practically insoluble in water and ether.

Metformin hydrochloride, USP (N,N-dimethylimidodicarbonimidic diamide monochloride) is a white crystalline powder with a molecular formula of C₄H₁₁N₅•HCl and a molecular weight of 165.6. Metformin hydrochloride is very soluble in water, slightly soluble in ethanol, and is practically insoluble in ether, and chloroform. The structural formula is as shown:

Pioglitazone and metformin hydrochloride tablets are available for oral administration containing 15 mg pioglitazone hydrochloride (as the base) with 500 mg metformin hydrochloride (15 mg/500 mg) or 15 mg pioglitazone hydrochloride (as the base) with 850 mg metformin hydrochloride (15 mg/850 mg) formulated with the following excipients: croscarmellose sodium, hypromellose, magnesium stearate, microcrystalline cellulose, polydextrose, polyethylene glycol, povidone, sodium lauryl sulfate, titanium dioxide and triacetin.

12 CLINICAL PHARMACOLOGY

12.1 Mechanism of Action

Pioglitazone and metformin hydrochloride tablets combine two antidiabetic medications with different mechanisms of action to improve glycemic control in adults with type 2 diabetes: pioglitazone hydrochloride, a thiazolidinedione, and metformin hydrochloride, a biguanide. Thiazolidinediones are insulin-sensitizing agents that act primarily by enhancing peripheral glucose utilization, whereas biguanides act primarily by decreasing endogenous hepatic glucose production.

Pioglitazone

Pioglitazone is a thiazolidinedione that depends on the presence of insulin for its mechanism of action. Pioglitazone decreases insulin resistance in the periphery and in the liver resulting in increased insulin-dependent glucose disposal and decreased hepatic glucose output. Pioglitazone is not an insulin secretagogue. Pioglitazone is an agonist for peroxisome proliferator-activated receptor-gamma (PPARγ). PPAR receptors are found in tissues important for insulin action such as adipose tissue, skeletal muscle, and liver. Activation of PPARγ nuclear receptors modulates the transcription of a number of insulin responsive genes involved in the control of glucose and lipid metabolism.

In animal models of diabetes, pioglitazone reduces the hyperglycemia, hyperinsulinemia, and hypertriglyceridemia characteristic of insulin-resistant states such as type 2 diabetes. The metabolic changes produced by pioglitazone result in increased responsiveness of insulin-dependent tissues and are observed in numerous animal models of insulin resistance.

Because pioglitazone enhances the effects of circulating insulin (by decreasing insulin resistance), it does not lower blood glucose in animal models that lack endogenous insulin.

Metformin Hydrochloride

Metformin hydrochloride improves glucose tolerance in patients with type 2 diabetes, lowering both basal and postprandial plasma glucose. Metformin decreases hepatic glucose production, decreases intestinal absorption of glucose and improves insulin sensitivity by increasing peripheral glucose uptake and utilization. Metformin does not produce hypoglycemia in either patients with type 2 diabetes or healthy subjects [except in specific circumstances, see Warnings and Precautions (5.7) ] and does not cause hyperinsulinemia. With metformin therapy, insulin secretion remains unchanged while fasting insulin levels and day-long plasma insulin response may actually decrease.

12.2 Pharmacodynamics

Pioglitazone

Clinical studies demonstrate that pioglitazone improves insulin sensitivity in insulin-resistant patients. Pioglitazone enhances cellular responsiveness to insulin, increases insulin-dependent glucose disposal and improves hepatic sensitivity to insulin. In patients with type 2 diabetes, the decreased insulin resistance produced by pioglitazone results in lower plasma glucose concentrations, lower plasma insulin concentrations, and lower HbA1c values. In controlled clinical trials, pioglitazone had an additive effect on glycemic control when used in combination with a sulfonylurea, metformin, or insulin [see Clinical Studies (14)].

Patients with lipid abnormalities were included in clinical trials with pioglitazone. Overall, patients treated with pioglitazone had mean decreases in serum triglycerides, mean increases in HDL cholesterol, and no consistent mean changes in LDL and total cholesterol. There is no conclusive evidence of macrovascular benefit with pioglitazone or any other antidiabetic medication [see Warnings and Precautions (5.15) and Adverse Reactions (6.1)].

In a 26-week, placebo-controlled, dose-ranging monotherapy study, mean serum triglycerides decreased in the 15 mg, 30 mg, and 45 mg pioglitazone dose groups compared to a mean increase in the placebo group. Mean HDL cholesterol increased to a greater extent in patients treated with pioglitazone than in the placebo-treated patients. There were no consistent differences for LDL and total cholesterol in patients treated with pioglitazone compared to placebo (Table 16).

In the two other monotherapy studies (16 weeks and 24 weeks) and in combination therapy studies with metformin (16 weeks and 24 weeks), the results were generally consistent with the data above.

12.3 Pharmacokinetics

Absorption

In bioequivalence studies of pioglitazone and metformin hydrochloride tablets 15 mg/500 mg and 15 mg/850 mg, the area under the curve (AUC) and maximum concentration (C_max) of both the pioglitazone and the metformin component following a single dose of the combination tablet were bioequivalent to pioglitazone hydrochloride 15 mg concomitantly administered with metformin hydrochloride (500 mg or 850 mg respectively) tablets under fasted conditions in healthy subjects.

Administration of pioglitazone and metformin hydrochloride tablets 15 mg/850 mg with food resulted in no change in overall exposure of pioglitazone. With metformin there was no change in AUC; however, mean peak serum concentration of metformin was decreased by 28% when administered with food. A delayed time to peak serum concentration was observed for both components (1.9 hours for pioglitazone and 0.8 hours for metformin) under fed conditions. These changes are not likely to be clinically significant.

Pioglitazone:Following once daily administration of pioglitazone, steady-state serum concentrations of both pioglitazone and its major active metabolites, M-III (keto derivative of pioglitazone) and M-IV (hydroxyl derivative of pioglitazone), are achieved within 7 days. At steady-state, M-III and M-IV reach serum concentrations equal to or greater than that of pioglitazone. At steady-state, in both healthy volunteers and patients with type 2 diabetes, pioglitazone comprises approximately 30% to 50% of the peak total pioglitazone serum concentrations (pioglitazone plus active metabolites) and 20% to 25% of the total AUC.

Maximum serum concentration (C_max), AUC, and trough serum concentrations (C_min) for pioglitazone and M-III and M-IV, increased proportionally with administered doses of 15 mg and 30 mg per day.

Following oral administration of pioglitazone hydrochloride, peak concentrations of pioglitazone were observed within 2 hours. Food slightly delays the time to peak serum concentration (T_max) to 3 to 4 hours, but does not alter the extent of absorption (AUC).

The absolute bioavailability of a 500 mg metformin tablet given under fasting conditions is approximately 50% to 60%. Studies using single oral doses of metformin tablets of 500 mg to 1500 mg, and 850 mg to 2550 mg, indicate that there is a lack of dose proportionality with increasing doses, which is due to decreased absorption rather than an alteration in elimination. Food decreases the extent of and slightly delays the absorption of metformin, as shown by approximately a 40% lower mean peak plasma concentration, a 25% lower AUC in plasma concentration versus time curve, and a 35 minute prolongation of time to peak plasma concentration following administration of a single 850 mg tablet of metformin with food, compared to the same tablet strength administered fasting. The clinical relevance of these decreases is unknown.

Distribution

The mean apparent volume of distribution (Vd/F) of pioglitazone following single-dose administration is 0.63 ± 0.41 (mean ± SD) L/kg of body weight. Pioglitazone is extensively protein bound (> 99%) in human serum, principally to serum albumin. Pioglitazone also binds to other serum proteins, but with lower affinity. M-III and M-IV are also extensively bound (> 98%) to serum albumin.

The apparent volume of distribution (Vd/F) of metformin following single oral doses of 850 mg immediate-release metformin averaged 654 ± 358 L. Metformin is negligibly bound to plasma proteins. Metformin partitions into erythrocytes, most likely as a function of time. At usual clinical doses and dosing schedules of metformin, steady-state plasma concentrations of metformin are reached within 24 to 48 hours and are generally < 1 mcg/mL. During controlled clinical trials, maximum metformin plasma levels did not exceed 5 mcg/mL, even at maximum doses.

Metabolism

Pioglitazone is extensively metabolized by hydroxylation and oxidation; the metabolites also partly convert to glucuronide or sulfate conjugates. Metabolites M-III and M-IV are the major circulating active metabolites in humans.

In vitro data demonstrate that multiple CYP isoforms are involved in the metabolism of pioglitazone. The cytochrome P450 isoforms involved are CYP2C8 and, to a lesser degree, CYP3A4 with additional contributions from a variety of other isoforms including the mainly extrahepatic CYP1A1. In vivo study of pioglitazone in combination with gemfibrozil, a strong CYP2C8 inhibitor, showed that pioglitazone is a CYP2C8 substrate [see Dosage and Administration (2.3) and Drug Interactions (7.1)]. Urinary 6ß-hydroxycortisol/cortisol ratios measured in patients treated with pioglitazone showed that pioglitazone is not a strong CYP3A4 enzyme inducer.

Intravenous single-dose studies in healthy subjects demonstrate that metformin is excreted unchanged in the urine and does not undergo hepatic metabolism (no metabolites have been identified in humans) nor biliary excretion.

Excretion and Elimination

Following oral administration, approximately 15% to 30% of the pioglitazone dose is recovered in the urine. Renal elimination of pioglitazone is negligible and the drug is excreted primarily as metabolites and their conjugates. It is presumed that most of the oral dose is excreted into the bile either unchanged or as metabolites and eliminated in the feces.

The mean serum half-life of pioglitazone and its metabolites (M-III and M-IV) range from 3 to 7 hours and 16 to 24 hours, respectively. Pioglitazone has an apparent clearance, CL/F, calculated to be 5 to 7 L/hr.

Renal clearance is approximately 3.5 times greater than creatinine clearance which indicates that tubular secretion is the major route of metformin elimination. Following oral administration, approximately 90% of the absorbed drug is eliminated via the renal route within the first 24 hours, with a plasma elimination half-life of approximately 6.2 hours. In blood, the elimination half-life is approximately 17.6 hours, suggesting that the erythrocyte mass may be a compartment of distribution.

Specific Populations

The serum elimination half-life of pioglitazone, M-III and M-IV remains unchanged in patients with moderate (creatinine clearance 30 to 50 mL/min) and severe (creatinine clearance < 30 mL/min) renal impairment when compared to subjects with normal renal function. Therefore, no dose adjustment in patients with renal impairment is required.

In patients with decreased renal function (based on creatinine clearance), the plasma and blood half-life of metformin is prolonged and the renal clearance is decreased in proportion to the decrease in creatinine clearance [see Contraindications (4) and Warnings and Precautions (5.2)]. Because metformin is contraindicated in patients with renal impairment, pioglitazone and metformin hydrochloride tablets are also contraindicated in these patients.

Compared with healthy controls, subjects with impaired hepatic function (Child-Turcotte-Pugh Grade B/C) have an approximate 45% reduction in pioglitazone and total pioglitazone (pioglitazone, M-III and M-IV) mean peak concentrations but no change in the mean AUC values. Therefore, no dose adjustment in patients with hepatic impairment is required.

There are post-marketing reports of liver failure with pioglitazone and clinical trials have generally excluded patients with serum ALT > 2.5 times the upper limit of the reference range. Use pioglitazone and metformin hydrochloride tablets with caution in patients with liver disease [see Warnings and Precautions (5.4)].

No pharmacokinetic studies of metformin have been conducted in subjects with hepatic impairment. Use of metformin in patients with hepatic impairment has been associated with some cases of lactic acidosis. Pioglitazone and metformin hydrochloride tablets are not recommended in patients with hepatic impairment [see Warnings and Precautions (5.4)].

In healthy elderly subjects, peak serum concentrations of pioglitazone are not significantly different, but AUC values are approximately 21% higher than those achieved in younger subjects. The mean terminal half-life values of pioglitazone were also longer in elderly subjects (about 10 hours) as compared to younger subjects (about 7 hours). These changes were not of a magnitude that would be considered clinically relevant.

Limited data from controlled pharmacokinetic studies of metformin in healthy elderly subjects suggest that total plasma clearance is decreased, the half-life is prolonged, and C_max is increased, compared to healthy young subjects. From these data, it appears that the change in metformin pharmacokinetics with aging is primarily accounted for by a change in renal function.

As is true for all patients, pioglitazone and metformin hydrochloride tablets treatment should not be initiated in geriatric patients unless measurement of creatinine clearance demonstrates that renal function is not reduced [see Warnings and Precautions (5.2)].

Safety and efficacy of pioglitazone in pediatric patients have not been established. Pioglitazone and metformin hydrochloride tablets are not recommended for use in pediatric patients [see Use in Specific Populations (8.4)].

After administration of a single oral metformin 500 mg tablet with food, geometric mean metformin C_max and AUC differed less than 5% between pediatric type 2 diabetic patients (12 to 16 years of age) and gender- and weight-matched healthy adults (20 to 45 years of age), and all with normal renal function.

The mean C_max and AUC values of pioglitazone were increased 20% to 60% in women compared to men. In controlled clinical trials, HbA1c decreases from baseline were generally greater for females than for males (average mean difference in HbA1c 0.5%). Because therapy should be individualized for each patient to achieve glycemic control, no dose adjustment is recommended based on gender alone.

Metformin pharmacokinetic parameters did not differ significantly between normal subjects and patients with type 2 diabetes when analyzed according to gender (males = 19, females = 16). Similarly, in controlled clinical studies in patients with type 2 diabetes, the antihyperglycemic effect of metformin was comparable in males and females.

Pharmacokinetic data among various ethnic groups are not available.

No studies of metformin pharmacokinetic parameters according to race have been performed. In controlled clinical studies of metformin in patients with type 2 diabetes, the antihyperglycemic effect was comparable in whites (n = 249), blacks (n = 51), and Hispanics (n = 24).

Specific pharmacokinetic drug interaction studies with pioglitazone and metformin hydrochloride tablets have not been performed, although such studies have been conducted with the individual pioglitazone and metformin components.

13 NONCLINICAL TOXICOLOGY

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Pioglitazone and Metformin Hydrochloride Tablets

No animal studies have been conducted with pioglitazone and metformin hydrochloride tablets. The following data are based on findings in studies performed with pioglitazone or metformin individually.

Pioglitazone

A 2-year carcinogenicity study was conducted in male and female rats at oral doses up to 63 mg/kg (approximately 14 times the maximum recommended human oral dose of 45 mg based on mg/m²). Drug-induced tumors were not observed in any organ except for the urinary bladder. Benign and/or malignant transitional cell neoplasms were observed in male rats at 4 mg/kg/day and above (approximately equal to the maximum recommended human oral dose based on mg/m²). A 2-year carcinogenicity study was conducted in male and female mice at oral doses up to 100 mg/kg/day (approximately 11 times the maximum recommended human oral dose based on mg/m²). No drug-induced tumors were observed in any organ.

Pioglitazone hydrochloride was not mutagenic in a battery of genetic toxicology studies, including the Ames bacterial assay, a mammalian cell forward gene mutation assay (CHO/HPRT and AS52/XPRT), an in vitro cytogenetics assay using CHL cells, an unscheduled DNA synthesis assay, and an in vivo micronucleus assay.

No adverse effects upon fertility were observed in male and female rats at oral doses up to 40 mg/kg pioglitazone hydrochloride daily prior to and throughout mating and gestation (approximately 9 times the maximum recommended human oral dose based on mg/m²).

Metformin Hydrochloride

Long-term carcinogenicity studies have been performed in rats (dosing duration of 104 weeks) and mice (dosing duration of 91 weeks) at doses up to and including 900 mg/kg/day and 1500 mg/kg/day, respectively. These doses are both approximately four times a human daily dose of 2000 mg of the metformin component of pioglitazone and metformin hydrochloride tablets based on body surface area comparisons. No evidence of carcinogenicity with metformin was found in either male or female mice. Similarly, there was no tumorigenic potential observed with metformin in male rats. There was, however, an increased incidence of benign stromal uterine polyps in female rats treated with 900 mg/kg/day.

There was no evidence of mutagenic potential of metformin in the following in vitro tests: Ames test (S. typhimurium), gene mutation test (mouse lymphoma cells), or chromosomal aberrations test (human lymphocytes). Results in the in vivo mouse micronucleus test were also negative.

Fertility of male or female rats was unaffected by metformin when administered at doses as high as 600 mg/kg/day, which is approximately three times the maximum recommended human daily dose of the metformin component of pioglitazone and metformin hydrochloride tablets based on body surface area comparisons.

13.2 Animal Toxicology and/or Pharmacology

Heart enlargement has been observed in mice (100 mg/kg), rats (4 mg/kg and above) and dogs (3 mg/kg) treated orally with pioglitazone hydrochloride (approximately 11, 1, and 2 times the maximum recommended human oral dose for mice, rats, and dogs, respectively, based on mg/m²). In a one-year rat study, drug-related early death due to apparent heart dysfunction occurred at an oral dose of 160 mg/kg/day (approximately 35 times the maximum recommended human oral dose based on mg/m²). Heart enlargement was seen in a 13-week study in monkeys at oral doses of 8.9 mg/kg and above (approximately 4 times the maximum recommended human oral dose based on mg/m²), but not in a 52-week study at oral doses up to 32 mg/kg (approximately 13 times the maximum recommended human oral dose based on mg/m²).

13.3 Reproductive and Developmental Toxicology

Pioglitazone was not teratogenic in rats at oral doses up to 80 mg/kg or in rabbits given up to 160 mg/kg during organogenesis (approximately 17 and 40 times the maximum recommended human oral dose based on mg/m², respectively). Delayed parturition and embryotoxicity (as evidenced by increased postimplantation losses, delayed development and reduced fetal weights) were observed in rats at oral doses of 40 mg/kg/day and above (approximately 10 times the maximum recommended human oral dose based on mg/m²). No functional or behavioral toxicity was observed in offspring of rats. In rabbits, embryotoxicity was observed at an oral dose of 160 mg/kg (approximately 40 times the maximum recommended human oral dose based on mg/m²). Delayed postnatal development, attributed to decreased body weight, was observed in offspring of rats at oral doses of 10 mg/kg and above during late gestation and lactation periods (approximately 2 times the maximum recommended human oral dose based on mg/m²).

14 CLINICAL STUDIES

14.2 Patients Previously Treated with Metformin

The efficacy and safety of pioglitazone as add-on to metformin therapy have been established in two clinical studies. Bioequivalence of pioglitazone and metformin hydrochloride tablets with coadministered pioglitazone and metformin tablets was demonstrated for both pioglitazone and metformin hydrochloride tablets strengths [see Clinical Pharmacology (12.3)].

The two clinical trials testing pioglitazone as add-on to metformin therapy included patients with type 2 diabetes on any dose of metformin, either alone or in combination with another antidiabetic agent. All other antidiabetic agents were withdrawn at least 3 weeks prior to starting study treatment.

In the first trial, 328 patients were randomized to receive either 30 mg of pioglitazone or placebo once daily for 16 weeks in addition to their current metformin regimen. Treatment with pioglitazone as add-on to metformin produced statistically significant improvements in HbA1c and FPG at endpoint compared to placebo add-on to metformin (see Table 21).

In the second trial, 827 patients were randomized to receive either 30 mg or 45 mg of pioglitazone once daily for 24 weeks in addition to their current metformin regimen. The mean reduction from baseline at Week 24 in HbA1c was 0.8% for the 30 mg dose and 1% for the 45 mg dose (see Table 22). The mean reduction from baseline at Week 24 in FPG was 38 mg/dL for the 30 mg dose and 51 mg/dL for the 45 mg dose.

The therapeutic effect of pioglitazone in combination with metformin was observed in patients regardless of the metformin dose.

16 HOW SUPPLIED/STORAGE AND HANDLING

Pioglitazone and Metformin Hydrochloride Tablets, USP are available in 15 mg pioglitazone hydrochloride, USP (as the base)/500 mg metformin hydrochloride, USP and 15 mg pioglitazone hydrochloride, USP (as the base)/850 mg metformin hydrochloride, USP tablets.

The 15 mg/500 mg tablets are white to off-white film-coated, oval, unscored tablets debossed with MYLAN on one side of the tablet and P155 on the other side. They are available as follows:

NDC 0378-1550-91
bottles of 60 tablets

NDC 0378-1550-80
bottles of 180 tablets

NDC 0378-1550-10
bottles of 1000 tablets

The 15 mg/850 mg tablets are white to off-white film-coated, oval, unscored tablets debossed with MYLAN on one side of the tablet and P157 on the other side. They are available as follows:

NDC 0378-1575-91
bottles of 60 tablets

NDC 0378-1575-80
bottles of 180 tablets

NDC 0378-1575-05
bottles of 500 tablets

Store at 20° to 25°C (68° to 77°F). [See USP Controlled Room Temperature.]

Protect from moisture and humidity.

Dispense in a tight, light-resistant container as defined in the USP using a child-resistant closure.

PHARMACIST: Dispense a Medication Guide with each prescription.

17 PATIENT COUNSELING INFORMATION

See FDA-approved patient labeling (Medication Guide)

17.1 Instructions

• •It is important to instruct patients to adhere to dietary instructions and to have blood glucose and glycosylated hemoglobin tested regularly. During periods of stress such as fever, trauma, infection, or surgery, medication requirements may change and patients should be reminded to seek medical advice promptly.
• •Tell patients to promptly report any sign of macroscopic hematuria or other symptoms such as dysuria or urinary urgency that develop or increase during treatment as these may be due to bladder cancer.
• •Explain to patients the risks of lactic acidosis, its symptoms and conditions that predispose to its development, as noted in the Warnings and Precautions (5.2) section. Advise patients to discontinue pioglitazone and metformin hydrochloride tablets immediately and to promptly notify their healthcare professional if unexplained hyperventilation, myalgia, gastrointestinal symptoms, malaise, unusual somnolence or other nonspecific symptoms occur.
• •Counsel patients against excessive alcohol intake while receiving pioglitazone and metformin hydrochloride tablets.
• •Inform patients to immediately report symptoms of an unusually rapid increase in weight or edema, shortness of breath or other symptoms of heart failure while receiving pioglitazone and metformin hydrochloride tablets.
• •Tell patients to promptly stop taking pioglitazone and metformin hydrochloride tablets and seek immediate medical advice if there is unexplained nausea, vomiting, abdominal pain, fatigue, anorexia, or dark urine as these symptoms may be due to hepatotoxicity.
• •Inform patients about the importance of regular testing of renal function and hematologic parameters when receiving treatment with pioglitazone and metformin hydrochloride tablets.
• •Therapy with a thiazolidinedione, which is the active pioglitazone component of the pioglitazone and metformin hydrochloride tablets, may result in ovulation in some premenopausal anovulatory women. As a result, these patients may be at an increased risk for pregnancy while taking pioglitazone and metformin hydrochloride tablets. Recommend adequate contraception for all pre-menopausal women who are prescribed pioglitazone and metformin hydrochloride tablets.
• •Patients should be advised to notify their health practitioner or call the Poison Control Center immediately in case of pioglitazone and metformin hydrochloride tablets overdose.
• •Combination antihyperglycemic therapy may cause hypoglycemia. When initiating pioglitazone and metformin hydrochloride tablets, the risks of hypoglycemia, its symptoms and treatment, and conditions that predispose to its development should be explained to patients and their family members.
• •Patients should be told to take pioglitazone and metformin hydrochloride tablets as prescribed and instructed that any change in dosing should only be done if directed by their physician. If a dose is missed on one day, the dose should not be doubled the following day.

17.2 FDA-Approved Medication Guide

See attached leaflet.

MEDICATION GUIDE

PIOGLITAZONE AND METFORMIN HYDROCHLORIDE TABLETS, USP

(pye′′ oh gli′ ta zone and met for′ min hye′′ droe klor′ ide)
15 mg/500 mg and 15 mg/850 mg

Read this Medication Guide carefully before you start taking pioglitazone and metformin hydrochloride tablets and each time you get a refill. There may be new information. This information does not take the place of talking with your doctor about your medical condition or your treatment. If you have any questions about pioglitazone and metformin hydrochloride tablets, ask your doctor or pharmacist.

What is the most important information I should know about pioglitazone and metformin hydrochloride tablets?

Pioglitazone and metformin hydrochloride tablets can cause serious side effects, including:

• • New or worse heart failure. Pioglitazone, one of the medicines in pioglitazone and metformin hydrochloride tablets, can cause your body to keep extra fluid (fluid retention), which leads to swelling (edema) and weight gain. Extra body fluid can make some heart problems worse or lead to heart failure. Heart failure means your heart does not pump blood well enough.
  • •Do not take pioglitazone and metformin hydrochloride tablets if you have severe heart failure
  • •If you have heart failure with symptoms (such as shortness of breath or swelling), even if these symptoms are not severe, pioglitazone and metformin hydrochloride tablets may not be right for you.
    
    
•   Call your doctor right away if you have any of the following:
  • •swelling or fluid retention, especially in the ankles or legs
  • •shortness of breath or trouble breathing, especially when you lie down
  • •an unusually fast increase in weight
  • •unusual tiredness
• • Lactic Acidosis. Metformin, one of the medicines in pioglitazone and metformin hydrochloride tablets, can cause a rare but serious condition called lactic acidosis (a buildup of an acid in the blood) that can cause death. Lactic acidosis is a medical emergency and must be treated in the hospital.
  
  
•   Call your doctor right away if you have any of the following symptoms which could be signs of lactic acidosis:
  • •you feel weak or tired
  • •you have unusual (not normal) muscle pain
  • •you have stomach pains, nausea or vomiting
  • •you have trouble breathing
  • •you feel dizzy or lightheaded
  • •you have a slow or irregular heartbeat

Most people who have had lactic acidosis with metformin have other things that, combined with the metformin, led to the lactic acidosis. Tell your doctor if you have any of the following, because you have a higher chance for getting lactic acidosis with pioglitazone and metformin hydrochloride tablets if you:

• •have kidney problems or your kidneys are affected by certain x-ray tests that use injectable dye. People whose kidneys are not working properly should not take pioglitazone and metformin hydrochloride tablets
• •have liver problems
• •drink alcohol very often, or drink a lot of alcohol in short-term "binge" drinking
• •get dehydrated (lose a large amount of body fluids). This can happen if you are sick with a fever, vomiting, or diarrhea. Dehydration can also happen when you sweat a lot with activity or exercise and do not drink enough fluids
• •have surgery
• •have a heart attack, severe infection, or stroke
• •are 80 years of age or older and have not had your kidneys tested

The best way to keep from having a problem with lactic acidosis from metformin is to tell your doctor if you have any of the problems in the list above. Your doctor may decide to stop your pioglitazone and metformin hydrochloride tablets for a while if you have any of these things.

Pioglitazone and metformin hydrochloride tablets can have other serious side effects. See “What are the possible side effects of pioglitazone and metformin hydrochloride tablets?”

What are pioglitazone and metformin hydrochloride tablets?

Pioglitazone and metformin hydrochloride tablets contain two prescription diabetes medicines called pioglitazone hydrochloride (Actos^®*) and metformin hydrochloride (Glucophage^®*). Pioglitazone and metformin hydrochloride tablets can be used with diet and exercise to improve blood sugar (glucose) control in adults with type 2 diabetes.

Pioglitazone and metformin hydrochloride tablets are not for people with type 1 diabetes.

Pioglitazone and metformin hydrochloride tablets are not for people with diabetic ketoacidosis (increased ketones in your blood or urine).

It is not known if pioglitazone and metformin hydrochloride tablets are safe and effective in children.

Who should not take pioglitazone and metformin hydrochloride tablets?

See “What is the most important information I should know about pioglitazone and metformin hydrochloride tablets?”

Do not take pioglitazone and metformin hydrochloride tablets if you:

• •have severe heart failure
• •are allergic to pioglitazone, metformin or any of the ingredients in pioglitazone and metformin hydrochloride tablets. See the end of this Medication Guide for a complete list of ingredients in pioglitazone and metformin hydrochloride tablets
• •have kidneys which are not working properly
• •have a condition called metabolic acidosis, including diabetic ketoacidosis. Diabetic ketoacidosis should be treated with insulin

Tell your doctor before taking pioglitazone and metformin hydrochloride tablets if you have any of these conditions.

What should I tell my doctor before taking pioglitazone and metformin hydrochloride tablets?

Before you start taking pioglitazone and metformin hydrochloride tablets, tell your doctor if you:

• • have heart failure
• • have kidney problems
• • are going to have dye injected into a vein for an x-ray, CAT scan, heart study, or other type of scanning
• • will be undergoing a surgical procedure
• • drink a lot of alcohol (all the time or short binge drinking)
• • have type 1 (“juvenile”) diabetes or had diabetic ketoacidosis
• • have a type of diabetic eye disease that causes swelling in the back of the eye (macular edema)
• • have liver problems
• • are pregnant or plan to become pregnant. It is not known if pioglitazone and metformin hydrochloride tablets will harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant about the best way to control your blood glucose levels while pregnant
• • are a premenopausal woman (before the “change of life”), who does not have periods regularly or at all. Pioglitazone and metformin hydrochloride tablets may increase your chance of becoming pregnant. Talk to your doctor about birth control choices while taking pioglitazone and metformin hydrochloride tablets. Tell your doctor right away if you become pregnant while taking pioglitazone and metformin hydrochloride tablets
• • are breast-feeding or plan to breast-feed. It is not known if pioglitazone and metformin hydrochloride pass into your breast milk. You and your doctor should decide if you will take pioglitazone and metformin hydrochloride tablets or breast-feed. You should not do both. Talk to your doctor about the best way to control your blood glucose levels while breast-feeding

Tell your doctor about all the medicines you take including prescription and nonprescription medicines, vitamins, and herbal supplements.

Pioglitazone and metformin hydrochloride tablets and some of your other medicines can affect each other. You may need to have your dose of pioglitazone and metformin hydrochloride tablets or certain other medicines changed.

Know the medicines you take. Keep a list of your medicines and show it to your doctor and pharmacist before you start a new medicine. They will tell you if it is okay to take pioglitazone and metformin hydrochloride tablets with other medicines.

How should I take pioglitazone and metformin hydrochloride tablets?

• •Take pioglitazone and metformin hydrochloride tablets exactly as your doctor tells you to take it.
• •Your doctor may need to change your dose of pioglitazone and metformin hydrochloride tablets. Do not change your pioglitazone and metformin hydrochloride tablets dose unless your doctor tells you to
• •Pioglitazone and metformin hydrochloride tablets may be prescribed alone or with other diabetes medicines. This will depend on how well your blood sugar is controlled
• •Take pioglitazone and metformin hydrochloride tablets with meals to lower your chance of an upset stomach
• •If you miss a dose of pioglitazone and metformin hydrochloride tablets, take your next dose as prescribed unless your doctor tells you differently. Do not take two doses at one time the next day
• •If you take too much pioglitazone and metformin hydrochloride tablets, call your doctor or go to the nearest hospital emergency room right away
• •If your body is under stress such as from a fever, infection, accident, or surgery, the dose of your diabetes medicines may need to be changed. Call your doctor right away
• •Stay on your diet and exercise programs and test your blood sugar regularly while taking pioglitazone and metformin hydrochloride tablets
• •Your doctor should do certain blood tests before you start and while you take pioglitazone and metformin hydrochloride tablets
• •Your doctor should also do hemoglobin A1C testing to check how well your blood sugar is controlled with pioglitazone and metformin hydrochloride tablets
• •Your doctor should check your eyes regularly while you take pioglitazone and metformin hydrochloride tablets

What are the possible side effects of pioglitazone and metformin hydrochloride tablets?

Pioglitazone and metformin hydrochloride tablets may cause serious side effects including:

• • See “What is the most important information I should know about pioglitazone and metformin hydrochloride tablets?”
• • liver problems. Call your doctor right away if you have:
  • •nausea or vomiting
  • •stomach pain
  • •unusual or unexplained tiredness
  • •loss of appetite
  • •dark urine
  • •yellowing of your skin or the whites of your eyes
• • broken bones (fractures). Usually in the hand, upper arm, or foot in women. Talk to your doctor for advice on how to keep your bones healthy
• • bladder cancer. There may be an increased chance of having bladder cancer when you take pioglitazone and metformin hydrochloride tablets. You should not take pioglitazone and metformin hydrochloride tablets if you are receiving treatment for bladder cancer. Tell your doctor right away if you have any of the following symptoms of bladder cancer:
  • •blood or a red color in your urine
  • •an increased need to urinate
  • •pain while you urinate
• • low blood sugar (hypoglycemia). This can happen if you skip meals, if you also use another medicine that lowers blood sugar, or if you have certain medical problems. Lightheadedness, dizziness, shakiness, or hunger may happen if your blood sugar is too low. Call your doctor if low blood sugar levels are a problem for you
• • diabetic eye disease with swelling in the back of the eye (macular edema). Tell your doctor right away if you have any changes in your vision. Your doctor should check your eyes regularly
• • release of an egg from an ovary in a woman (ovulation) leading to pregnancy. Ovulation may happen when premenopausal women who do not have regular monthly periods take pioglitazone and metformin hydrochloride tablets. This can increase your chance of getting pregnant.
• • low red blood cell count (anemia).
  
  
•  The most common side effects of pioglitazone and metformin hydrochloride tablets include:
  • •cold-like symptoms (upper respiratory tract infection)
  • •swelling (edema)
  • •diarrhea
  • •headache
  • •increased weight

Tell your doctor if you have any side effect that bothers you or that does not go away. These are not all the side effects of pioglitazone and metformin hydrochloride tablets. For more information, ask your doctor or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

How should I store pioglitazone and metformin hydrochloride tablets?

• •Store pioglitazone and metformin hydrochloride tablets at 20° to 25°C (68° to 77°F). Protect from moisture and humidity. Keep pioglitazone and metformin hydrochloride tablets in the original container and protect from light.
• •Keep the pioglitazone and metformin hydrochloride tablets bottle tightly closed and protect from getting wet (away from moisture and humidity).

Keep pioglitazone and metformin hydrochloride tablets and all medicines out of the reach of children.

General information about the safe and effective use of pioglitazone and metformin hydrochloride tablets

Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use pioglitazone and metformin hydrochloride tablets for a condition for which it was not prescribed. Do not give pioglitazone and metformin hydrochloride tablets to other people, even if they have the same symptoms you have. It may harm them.

This Medication Guide summarizes the most important information about pioglitazone and metformin hydrochloride tablets. If you would like more information, talk with your doctor. You can ask your doctor or pharmacist for information about pioglitazone and metformin hydrochloride tablets that is written for healthcare professionals.

For more information call Mylan Pharmaceuticals Inc. at 1-877-446-3679 (1-877-4-INFO-RX).

What are the ingredients in pioglitazone and metformin hydrochloride tablets?

Active Ingredients: pioglitazone hydrochloride and metformin hydrochloride

Inactive Ingredients: croscarmellose sodium, hypromellose, magnesium stearate, microcrystalline cellulose, polydextrose, polyethylene glycol, povidone, sodium lauryl sulfate, titanium dioxide and triacetin

* The following are registered trademarks of their respective owners: Actos^®/Takeda Pharmaceutical Company and Glucophage^®/Merck Sante S.A.S.

This Medication Guide has been approved by the U.S. Food and Drug Administration.

Mylan Pharmaceuticals Inc.
Morgantown, WV 26505 U.S.A.

REVISED JANUARY 2014
PIOMET:R4mpbmt

Licensed – United States Patents Nos. 5,965,584, 6,166,042, 6,166,043 and 6,172,090.

PRINCIPAL DISPLAY PANEL - 15 mg* / 500 mg

NDC 0378-1550-91

Pioglitazone and
Metformin HCl
Tablets, USP
15 mg*/
500 mg

PHARMACIST: Dispense the accompanying
Medication Guide to each patient.

Rx only     60 Tablets

*Each film-coated tablet contains:
Pioglitazone hydrochloride, USP
equivalent to pioglitazone base       15 mg
Metformin hydrochloride, USP     500 mg

Dispense in a tight, light-resistant
container as defined in the USP
using a child-resistant closure.

Keep container tightly closed.

Keep this and all medication
out of the reach of children.

Store at 20° to 25°C (68° to 77°F).
[See USP Controlled Room
Temperature.]

Protect from moisture and
humidity.

Usual Dosage: See accompanying
prescribing information.

Licensed - United States Patent Nos.
5,965,584, 6,166,042, 6,166,043 and
6,172,090.

Mylan Pharmaceuticals Inc.
Morgantown, WV 26505 U.S.A.

RM1550D3