Carisoprodol

West-ward Pharmaceutical Corp

HIGHLIGHTS OF PRESCRIBING INFORMATION RECENT MAJOR CHANGESWarnings and Precautions, Sedation (5.1) 10/2009Warnings and Precautions, Drug Dependence, Withdrawal, and Abuse (5.2) 10/2009INDICATIONS AND USAGECarisoprodol is indicated for the relief of discomfort associated with acute, painful musculoskeletal conditions. (1) Important Limitations: Should only be used for acute treatment periods up to two or three weeks (1) Not recommended in pediatric patients less than 16 years of age (8.4) DOSAGE AND ADMINISTRATIONRecommended dose is 350 mg three times a day and at bedtime. (2)DOSAGE FORMS AND STRENGTHSTablets 350 mg (3)CONTRAINDICATIONS Acute intermittent porphyria (4) Hypersensitivity reactions to a carbamate such as meprobamate (4) WARNINGS AND PRECAUTIONS Due to sedative properties, may impair ability to perform hazardous tasks such as driving or operating machinery (5.1) Additive sedative effects when used with other CNS depressants including alcohol (5.1) Cases of Drug Dependence, Withdrawal, and Abuse (5.2) Seizures (5.3) Side EffectsMost common adverse reactions (incidence > 2%) are drowsiness, dizziness, and headache (6.1) To report SUSPECTED ADVERSE REACTIONS, contact West-ward Pharmaceuticals at 1-877-233-2001 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. DRUG INTERACTIONSCNS depressants (e.g., alcohol, benzodiazepines, opioids, tricyclic antidepressants) -additive sedative effects (5.1 and 7.1)

FULL PRESCRIBING INFORMATION: CONTENTS*

• RECENT MAJOR CHANGES
• 1 CARISOPRODOL INDICATIONS AND USAGE
• 2 CARISOPRODOL DOSAGE AND ADMINISTRATION
• 3 DOSAGE FORMS AND STRENGTHS
• 4 CARISOPRODOL CONTRAINDICATIONS
• 5 WARNINGS AND PRECAUTIONS
• 6 CARISOPRODOL ADVERSE REACTIONS
• 7 DRUG INTERACTIONS
• 8 USE IN SPECIFIC POPULATIONS
• 9 DRUG ABUSE AND DEPENDENCE
• 10 OVERDOSAGE
• 11 CARISOPRODOL DESCRIPTION
• 12 CLINICAL PHARMACOLOGY
• 16 HOW SUPPLIED
• 17 PATIENT COUNSELING INFORMATION
  • 17.1 Sedation
  • 17.2 Avoidance and Alcohol and Other CNS Depressants
  • 17.3 Carisoprodol Tablets Should Only be Used for Short-Term Treatment
• PRINCIPAL DISPLAY PANEL

FULL PRESCRIBING INFORMATION

RECENT MAJOR CHANGES

1 INDICATIONS AND USAGE

Carisoprodol Tablets are indicated for the relief of discomfort associated with acute, painful musculoskeletal conditions in adults.

Carisoprodol Tablets should only be used for short periods (up to two or three weeks) because adequate evidence of effectiveness for more prolonged use has not been established and because acute, painful musculoskeletal conditions are generally of short duration [see DOSAGE AND ADMINISTRATION (2)].

2 DOSAGE AND ADMINISTRATION

The recommended dose of Carisoprodol Tablets is 350 mg three times a day and at bedtime.  The recommended maximum duration of Carisoprodol Tablets use is up to two or three weeks.

3 DOSAGE FORMS AND STRENGTHS

Carisoprodol Tablets, USP 350 mg are white, round, unscored tablets; imprinted "WW 176".

4 CONTRAINDICATIONS

Carisoprodol Tablets are contraindicated in patients with a history of acute intermittent porphyria or a hypersensitivity reactions to a carbamate such as meprobamate

5 WARNINGS AND PRECAUTIONS

Carisoprodol Tablets have sedative properties (in the low back pain trials, 13% to 17% of patients who received Carisoprodol tablets experienced sedation compared to 6% of patients who received placebo) [see ADVERSE REACTIONS (6.1)] and may impair the mental and/or physical abilities required for the performance of potentially hazardous tasks such as driving a motor vehicle or operating machinery.  There have been post-marketing reports of motor vehicle accidents associated with the use of Carisoprodol Tablets.

Since the sedative effects of Carisoprodol and other CNS depressants (e.g., alcohol, benzodiazepines, opioids, tricyclic antidepressants) may be additive, appropriate caution should be exercised with patients who take more than one of these CNS depressants simultaneously.

In the postmarketing experience with Carisoprodol Tablets, cases of dependence, withdrawal, and abuse have been reported with prolonged use. Most cases of dependence, withdrawal, and abuse occurred in patients who have had a history of addiction or who used Carisoprodol tablets in combination with other drugs with abuse potential. However, there have been post-marketing adverse event reports of Carisoprodol Tablets-associated abuse when used without other drugs with abuse potential.  Withdrawal symptoms have been reported following abrupt cessation after prolonged use. To reduce the chance of Carisoprodol dependence, withdrawal, or abuse, Carisoprodol tablets should be used with caution in addictionprone patients and in patients taking other CNS depressants including alcohol, and Carisoprodol should not be used more than two to three weeks for the relief of acute musculoskeletal discomfort.

Carisoprodol Tablets, and one of its metabolites, meprobamate (a controlled substance), may cause dependence [see Clinical Pharmacology  (12.3) ].

There have been postmarketing reports of seizures in patients who received Carisoprodol Tablets. Most of these cases have occurred in the setting of multiple drug overdoses (including drugs of abuse, illegal drugs, and alcohol) [see  Overdosage (10) ].

6 ADVERSE REACTIONS

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

The data described below are based on 1387 patients pooled from two double blind, randomized, multicenter, placebo controlled, one-week trials in adult patients with acute, mechanical, lower back pain [see Clinical Studies (14)]. In the study, patients were treated with 350 mg of Carisoprodol Tablets, or placebo three times a day and at bedtime for seven days. The mean age was about 41 years old with 54% females and 46% males and 74% Caucasian, 16% Black, 9% Asian, and 2% other.

There were no deaths and there were no serious adverse reactions in these two trials. In the study, 2.7%  and 5.4%, of patients treated with placebo and 350 mg of Carisoprodol Tablets, respectively, discontinued due to adverse events; and 0.5% and 1.8% of patients treated with placebo and 350 mg of Carisoprodol Tablets, respectively, discontinued due to central nervous system adverse reactions.

Table 1 displays adverse reactions reported with frequencies greater than 2% and more frequently than placebo in patients treated with Carisoprodol Tablets in the trial described above.

Table 1 – Patients with Adverse Reactions in Controlled Studies

The following events have been reported during postapproval use of Carisoprodol Tablets. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Cardiovascular: Tachycardia, postural hypotension, and facial flushing [see Overdosage (10)].

Central Nervous System: Drowsiness, dizziness, vertigo, ataxia, tremor, agitation, irritability, headache, depressive reactions, syncope, insomnia, and seizures [see Overdosage (10)].

Gastrointestinal: Nausea, vomiting, and epigastric discomfort.

Hematologics: Leukopenia, pancytopenia

7 DRUG INTERACTIONS

The sedative effects of Carisoprodol Tablets and other CNS depressants (e.g., alcohol, benzodiazepines, opioids, tricyclic antidepressants) may be additive. Therefore, caution should be exercised with patients who take more than one of these CNS depressants simultaneously. Concomitant use of Carisoprodol and meprobamate, a metabolite of Carisoprodol, is not recommended [see Warnings and Precautions  (5.1) ].

Carisoprodol Tablets are metabolized in the liver by CYP2C19 to form meprobamate [see Clinical Pharmacology  (12.1)]. Co-administration of CYP2C19 inhibitors, such as omeprazole or fluvoxamine, with Carisoprodol Tablets could result in increased exposure of carisoprodol and decreased exposure of meprobamate. Co-administration of CYP2C19 inducers, such as rifampin or St. John"s Wort, with Carisoprodol Tablets could result in decreased exposure of carisoprodol and increased exposure of meprobamate. Low dose aspirin also showed induction effect on CYP2C19. The full pharmacological impact of these potential alterations of exposures in terms of either efficacy or safety of Carisoprodol Tablets is unknown.

8 USE IN SPECIFIC POPULATIONS

There are no data on the use of Carisoprodol Tablets during human pregnancy. Animal studies indicate that carisoprodol crosses the placenta and results in adverse effects on fetal growth and postnatal survival. The primary metabolite of carisoprodol, meprobamate, is an approved anxiolytic. Retrospective, post-marketing studies do not show a consistent association between maternal use of meprobamate and an increased risk for particular congenital malformations.

Teratogenic effects: Animal studies have not adequately evaluated the teratogenic effects of carisoprodol. There was no increase in the incidence of congenital malformations noted in reproductive studies in rats, rabbits, and mice treated with meprobamate. Retrospective, post-marketing studies of meprobamate during human pregnancy were equivocal for demonstrating an increased risk of congenital malformations following first trimester exposure. Across studies that indicated an increased risk, the types of malformations were inconsistent.

Nonteratogenic effects: In animal studies, carisoprodol reduced fetal weights, postnatal weight gain, and postnatal survival at maternal doses equivalent to 1-1.5 times the human dose (based on a body surface area comparison). Rats exposed to meprobamate in-utero showed behavioral alterations that persisted into adulthood. For children exposed to meprobamate in-utero, one study found no adverse effects on mental or motor development or IQ scores. Carisoprodol Tablets should be used during pregnancy only if the potential benefit justifies the risk to the fetus.

There is no information about the effects of Carisoprodol Tablets on the mother and the fetus during labor and delivery.

Very limited data in humans show that Carisoprodol Tablets are present in breast milk and may reach concentrations two to four times the maternal plasma concentrations. In one case report, a breast-fed infant received about 4-6% of the maternal daily dose through breast milk and experienced no adverse effects. However, milk production was inadequate and the baby was supplemented with formula. In lactation studies in mice, female pup survival and pup weight at weaning were decreased. This information suggests that maternal use of Carisoprodol Tablets may lead to reduced or less effective infant feeding (due to sedation) and/or decreased milk production. Caution should be exercised when Carisoprodol Tablets are administered to a nursing woman.

The efficacy, safety, and pharmacokinetics of Carisoprodol Tablets in pediatric patients less than 16 years of age have not been established.

The efficacy, safety, and pharmacokinetics of Carisoprodol Tablets in patients over 65 years old have not been established.

The safety and pharmacokinetics of Carisoprodol Tablets in patients with renal impairment have not been evaluated. Since
Carisoprodol Tablets are excreted by the kidney, caution should be exercised if Carisoprodol Tablets are administered to patients with impaired renal function. Carisoprodol Tablets are dialyzable by hemodialysis and peritoneal dialysis.

The safety and pharmacokinetics of carisoprodol in patients with hepatic impairment have not been evaluated. Since Carisoprodol Tablets are metabolized in the liver, caution should be exercised if Carisoprodol Tablets are administered to patients with impaired hepatic function.

Patients with reduced CYP2C19 activity have higher exposure to Carisoprodol Tablets. Therefore, caution should be exercised in administration of Carisoprodol Tablets to these patients. [see Clinical Pharmacology  (12.3)].

9 DRUG ABUSE AND DEPENDENCE

Carisoprodol Tablets are not a controlled substance [see Warnings and Precautions (5.2) ]. Discontinuation of carisoprodol in animals or in humans after chronic administration can produce withdrawal signs, and there are published case reports of human carisoprodol dependence.

In vitro studies demonstrate that carisprodol elicits barbiturate-like effects. Animal behavior studies indicate that carisoprodol produces rewarding effects. Monkeys self administer carisoprodol. Drug discrimination studies using rats indicate that carisoprodol has positive reinforcing and discriminative effects similar to barbital, meprobamate, and chlordiazepoxide.

10 OVERDOSAGE

Overdosage of Carisoprodol Tablets commonly produces CNS depression. Death, coma, respiratory depression, hypotension, seizures, delirium, hallucinations, dystonic reactions, nystagmus, blurred vision, mydriasis, euphoria, muscular incoordination, rigidity, and/or headache have been reported with Carisoprodol Tablets overdosage. Many of the Carisoprodol Tablets overdoses have occurred in the setting of multiple drug overdoses (including drugs of abuse, illegal drugs, and alcohol). The effects of an overdose of Carisoprodol Tablets and other CNS depressants (e.g., alcohol, benzodiazepines, opioids, tricyclic antidepressants) can be additive even when one of the drugs has been taken in the recommended dosage. Fatal accidental and non-accidental overdoses of carisoprodol have been reported alone or in combination with CNS depressants.

Treatment of Overdosage: Basic life support measures should be instituted as dictated by the clinical presentation of the Carisoprodol Tablets overdose. Induced emesis is not recommended due to the risk of CNS and respiratory depression, which may increase the risk of aspiration pneumonia. Gastric lavage should be considered soon after ingestion (within one hour). Circulatory support should be administered with volume infusion and vasopressor agents if needed. Seizures should be treated with intravenous benzodiazepines and the reoccurrence of seizures may be treated with phenobarbital. In cases of severe CNS depression, airway protective reflexes may be compromised and tracheal intubation should be considered for airway protection and respiratory support.

The following types of treatment have been used successfully with an overdose of meprobamate, a metabolite of carisoprodol: activated charcoal (oral or via nasogastric tube), forced diuresis, peritoneal dialysis, and hemodialysis (carisoprodol is also dialyzable). Careful monitoring of urinary output is necessary and overhydration should be avoided. Observe for possible relapse due to incomplete gastric emptying and delayed absorption. For more information on the management of an overdose of carisoprodol, contact a Poison Control Center.

11 DESCRIPTION

Carisoprodol Tablets are available as 350 mg round, white tablets.  Carisoprodol is a white, crystalline powder, having a mild, characteristic odor and a bitter taste. It is slightly soluble in water; freely soluble in alcohol in chloroform, and in acetone; its solubility is practically independent of pH.  Carisoprodol is present as a racemic mixture.  Chemically, carisioprodol is N-isopropyl-2-methyl-2-propyl-1,3- propanediol dicarbamate and the molecular formula is C₁₂H₂₄N₂O₄, with a molecular weight of 260.33. The structural formula is:

Other Ingredients:  colloidal silicon dioxide, lactose monohydrate, magnesium stearate, microcrystalline cellulose, methylcellulose, povidone, sodium lauryl sulfate, sodium starch glycolate, and stearic acid.

12 CLINICAL PHARMACOLOGY

The mechanism of action of carisoprodol in relieving discomfort associated with acute painful musculoskeletal conditions has not been clearly identified.
In animal studies, muscle relaxation induced by carisoprodol is associated with altered interneuronal activity in the spinal cord and in the descending reticular formation of the brain.

Carisoprodol is a centrally acting skeletal muscle relaxant that does not directly relax skeletal muscles.

A metabolite of carisoprodol, meprobamate, has anxiolytic and sedative properties. The degree to which these properties of meprobamate contribute to the safety and efficacy of Carisoprodol Tablets is unknown.

The pharmacokinetics of carisoprodol and its metabolite meprobamate were studied in a crossover study of 24 healthy subjects (12 male and 12 female) who received single doses of 350 mg Carisoprodol (see Table 2).  The C_max of meprobamate was 2.5 ± 0.5 μg/mL (mean ± SD) after administration of a single 350 mg dose of carisoprodol, which is approximately 30% of the C_max of meprobamate (approximately 8 μg/mL) after administration of a single 400 mg dose of meprobamate.

Table 2. Pharmacokinetic Parameters of Carisoprodol and Meprobamate (Mean ± SD, n=24)

Absorption: Absolute bioavailability of carisoprodol has not been determined. The mean time to peak plasma concentrations (T_max) of carisoprodol was approximately 1.5 to 2 hours. Co-administration of a high-fat meal with Carisoprodol (350 mg tablet) had no effect on the pharmacokinetics of carisoprodol. Therefore, Carisoprodol Tablets may be administered with or without food.

Metabolism: The major pathway of carisoprodol metabolism is via the liver by cytochrome enzyme CYP2C19 to form meprobamate. This enzyme exhibits genetic polymorphism (see Patients with Reduced CYP2C19 Activity below).

Elimination: Carisoprodol is eliminated by both renal and non-renal routes with a terminal elimination half-life of approximately 2 hours. The half-life of meprobamate is approximately 10 hours.

Gender: Exposure of carisoprodol is higher in female than in male subjects (approximately 30-50% on a weight adjusted basis). Overall exposure of meprobamate is comparable between female and male subjects.

Patients with Reduced CYP2C19 Activity: Carisoprodol Tablets should be used with caution in patients with reduced CYP2C19 activity. Published studies indicate that patients who are poor CYP2C19 metabolizers have a 4-fold increase in exposure to carisoprodol, and concomitant 50% reduced exposure to meprobamate compared to normal CYP2C19 metabolizers. The prevalence of poor metabolizers in Caucasians and African Americans is approximately 3-5% and in Asians is approximately 15-20%.

Long term studies in animals have not been performed to evaluate the carcinogenic potential of carisoprodol.

Carisoprodol Tablets were not formally evaluated for genotoxicity. In published studies, carisoprodol was mutagenic in the in vitro mouse lymphoma cell assay in the absence of metabolizing enzymes, but was not mutagenic in the presence of metabolizing enzymes. Carisoprodol was clastogenic in the in vitro chromosomal aberration assay using Chinese hamster ovary cells with or without the presence of metabolizing enzymes. Other types of genotoxic tests resulted in negative findings. Carisoprodol was not mutagenic in the Ames reverse mutation assay using S. typhimurium strains with or without metabolizing enzymes, and was not clastogenic in an in vivo mouse micronucleus assay of circulating blood cells.

Carisoprodol was not formally evaluated for effects on fertility. Published reproductive studies of carisoprodol in mice found no alteration in fertility although an alteration in reproductive cycles characterized by a greater time spent in estrus was observed at a carisoprodol dose of 1200 mg/kg/day. In a 13-week toxicology study that did not determine fertility, mouse testes weight and sperm motility were reduced at a dose of 1200 mg/kg/day. In both studies, the no effect level was 750 mg/kg/day, corresponding to approximately 2.6 times the human equivalent dosage of 350 mg four times a day, based on a body surface area comparison. The significance of these findings for human fertility is not known.

The safety and efficacy of Carisoprodol Tablets for the relief of acute, idiopathic mechanical low back pain was evaluated in one, 7-day, double blind, randomized, multicenter, placebo controlled, U.S. trials (Study 1). Patients had to be 18 to 65 years old and had to have acute back pain (≤ 3 days of duration) to be included in the trials. Patients with chronic back pain; at increased risk for vertebral fracture (e.g., history of osteoporosis); with a history of spinal pathology (e.g., herniated nucleus pulposis, spondylolisthesis or spinal stenosis); with inflammatory back pain, or with evidence of a neurologic deficit were excluded from participation. Concomitant use of analgesics (e.g., acetaminophen, NSAIDs, tramadol, opioid agonists), other muscle relaxants, botulinum toxin, sedatives (e.g., barbiturates, benzodiazepines, promethazine hydrochloride), and anti-epileptic drugs was prohibited.

In Study 1, patients were randomized to one of three treatment groups (i.e., Carisoprodol Tablets 350 mg, or placebo). In the study patients received study medication three times a day and at bedtime for seven days.

The primary endpoints were the relief from starting backache and the global impression of change, as reported by patients, on Study Day 3. Both endpoints were scored on a 5-point rating scale from 0 (worst outcome) to 4 (best outcome) in both studies. The primary statistical comparison was between the Carisoprodol 250 mg and placebo groups in both studies.

The proportion of patients who used concomitant acetaminophen, NSAIDs, tramadol, opioid agonists, other muscle relaxants, and benzodiazepines was similar in the treatment groups.

The results for the primary efficacy evaluations in the acute, low back pain studies are presented in Table 3.

Table 3. Results of the Primary Efficacy Endpoints* in Study 1

*The primary efficacy endpoints (Relief from Starting Backache and Global Impression of Change) were assessed by the patients on Study Day #3. These endpoints were scored on a 5-point rating scale from 0 (worst outcome) to 4 (best outcome). 

†Mean is the least squared mean and SE is the standard error of the mean.

Patients treated with Carisoprodol Tablets experienced improvement in function as measured by the Roland-Morris Disability Questionnaire (RMDQ) score on Days 3 and 7.

16 HOW SUPPLIED

Carisoprodol Tablets, USP 350 mg, are white, round, unscored tablets; imprinted "WW 176", are available in:

Bottles of 100 tablets
Bottles of 500 tablets
Bottles of 1000 tablets

Store at 20-25^oC (68-77^oF) [See USP Controlled Room Temperature].
Dispense in a tight, light-resistant container as defined in the USP using a child-resistant closure.

17 PATIENT COUNSELING INFORMATION

Patients should be advised to contact their physician if they experience any adverse reactions to Carisoprodol Tablets.

17.1 Sedation

Patients should be advised that Carisoprodol Tablets may cause drowsiness and/or dizziness, and have been associated with motor vehicle accidents. Patients should be advised to avoid taking Carisoprodol Tablets before engaging in potentially hazardous activities such as driving a motor vehicle or operating machinery [see Warnings and Precautions  (5.1) ]

17.2 Avoidance and Alcohol and Other CNS Depressants

Patients should be advised to avoid alcoholic beverages while taking Carisoprodol Tablets and to check with their doctor before taking other CNS depressants such as benzodiazepines, opioids, tricyclic antidepressants, sedating antihistamines, or other sedatives [see Warnings and Precautions  (5.1) ].

17.3 Carisoprodol Tablets Should Only be Used for Short-Term Treatment

Patients should be advised that treatment with Carisoprodol Tablets should be limited to acute use (up to two or three weeks) for the relief of acute, musculoskeletal discomfort. In the post-marketing experience with Carisoprodol Tablets, cases of dependence, withdrawal, and abuse have been reported with prolonged use. If the musculoskeletal symptoms still persist, patients should contact their healthcare provider for further evaluation.

                             Manufactured for:
             West-ward Pharmaceutical Corp
                         Eatontown, NJ  07724

                           Manufactured by:
               Shasun Chemical and Drugs Ltd.
                         Pondicherry, India

Revised August 2010                                020000823

PRINCIPAL DISPLAY PANEL