Alprazolam

Par Pharmaceutical Inc.
Par Pharmaceutical Inc.

HIGHLIGHTS OF PRESCRIBING INFORMATION These highlights do not include all the information needed to use Alprazolam Orally Disintegrating Tablets safely and effectively. See full prescribing information for Alprazolam Orally Disintegrating Tablets.Alprazolam Orally Disintegrating Tablets CIVInitial U.S. Approval: 2005INDICATIONS AND USAGEAlprazolam is a benzodiazepine indicated for: The treatment of generalized anxiety disorder. ( 1.1 ) The efficacy of alprazolam was demonstrated in 5 short-term, placebo-controlled trials. ( 14 ) The treatment of panic disorder, with or without agoraphobia. ( 1.2 ) The efficacy of alprazolam in the treatment of panic disorder was established in 2 short-term, placebo-controlled trials. ( 14 ) DOSAGE AND ADMINISTRATION Indication Recommended Dose Anxiety Disorder (2.1) Initial: 0.25 mg to 0.5 mg given three times daily. Maximum: 4 mg per day given in divided doses Panic Disorder (2.2) Initial: 0.5 mg given three times daily Maximum: Doses up to 10 mg per day may be required to achieve a successful response With dry hands, place the tablet on top of the tongue where it will disintegrate and be swallowed with saliva. ( 2.4 ) Depending on response, the dose may be increased to achieve a maximum therapeutic effect, at intervals of 3 to 4 days. ( 2.1, 2.2 ) Use the lowest possible effective dose Periodically reassess the need for continued treatment. ( 2.1 ) In general, benzodiazepines should be prescribed for short periods. ( 2 ) Discontinuation of treatment or dose reduction should be gradual and under close physician supervision. Decrease the dosage by no more than 0.5 mg per day every 3 days. Some patients may require an even slower dosage reduction. ( 2.1, 2.2 ) Dosing in elderly: the starting dose is 0.25 mg, given two or three times daily. ( 2.3 ) Severe hepatic impairment: the starting dose is 0.25 mg, given two or three times daily. ( 2.3 ) DOSAGE FORMS AND STRENGTHS0.25 mg, 0.5 mg, 1 mg, or 2 mg scored orally disintegrating tablets ( 3 ) CONTRAINDICATIONS Acute narrow angle glaucoma. Alprazolam can exacerbate narrow angle closure. ( 4 ) Concomitant Use with potent CYP3A inhibitors (e.g., ketoconazole and itraconazole). Can increase the serum concentration of alprazolam. ( 4 ) WARNINGS AND PRECAUTIONS Suicide: As with other psychotropic medications, use precautions with respect to administration of the drug and size of the prescription, especially in patients who are severely depressed or in patients where there is reason to expect concealed suicidal ideation or plans.( 5.1 ) Status Epilepticus and Seizure: can occur during discontinuation of alprazolam. ( 5.2 ) Physical dependence to alprazolam can occur, even after relatively short-term use at the recommended doses. ( 5.3 ) Withdrawal reactions, such as seizures, can occur during dosage reduction. Avoid abrupt discontinuation. Reduce or discontinue the dose gradually. ( 5.3 ) Fetal Harm: Benzodiazepines can cause fetal harm when administered to pregnant women. ( 5.4 ) CNS Depression and Impaired Cognitive and Motor Performance: caution patients against engaging in hazardous occupations or activities requiring complete mental alertness, until they are reasonably certain that alprazolam treatment does not affect them adversely. Caution patients about the use of alcohol and other CNS depressant drugs during treatment with alprazolam. ( 5.5 ) Interdose anxiety symptoms: can occur at prescribed maintenance doses. Consider dividing the daily dose into more frequent administrations. ( 5.8 ) Patients with Concomitant Illness – In the elderly or debilitated patients, the smallest effective dose is recommended to preclude the development of ataxia or oversedation. There have been rare reports of death in patients with severe pulmonary disease shortly after the initiation of treatment with alprazolam. ( 5.11 ) Side Effects Anxiety Disorder : The most common adverse reactions (≥ 5% and ~twice the rate of placebo) were sedation, and hypotension. Panic Disorder : The most common adverse reactions included sedation,impaired coordination, dysarthria, and increased libido. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Par Pharmaceutical Companies, Inc. at 1-800-828-9393 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch DRUG INTERACTIONS Alprazolam produces additive CNS depressant effects when co¬administered with other psychotropic medications, anticonvulsants, antihistaminics, alcohol and other drugs that produce CNS depression. ( 7.1 ) The formulation requires an acidic environment to dissolve; therefore, drugs or diseases that cause dry mouth or raise stomach pH may slow disintegration or dissolution, resulting in decreased absorption. ( 7.2 ) Drugs which inhibit the hydroxylation catalyzed by cytochrome P450 3A (CYP3A) metabolic pathway can decrease the clearance of alprazolam and increase the serum concentration. ( 7.4 ) USE IN SPECIFIC POPULATIONS Teratogenic Effects: Pregnancy Category D. Alprazolam can cause fetal harm. ( 8.1 ) Nonteratogenic Effects: A neonate born to a mother who is treated with alprazolam may be at risk for withdrawal, flaccidity, and respiratory problems. ( 8.1 ) Nursing mothers: Chronic administration of diazepam to nursing mothers has been reported to cause their infants to become lethargic and to lose weight. ( 8.3 ) Geriatric use: The elderly exhibit higher plasma concentrations due to reduced clearance, compared with a younger population receiving the same doses. ( 8.5 ) Pediatric use: Safety and effectiveness of alprazolam in individuals below 18 years of age have not been established. ( 8.4 )

FULL PRESCRIBING INFORMATION: CONTENTS*

• 1 ALPRAZOLAM INDICATIONS AND USAGE
  • 1.1 Generalized Anxiety Disorder
  • 1.2 Panic Disorder
• 2 ALPRAZOLAM DOSAGE AND ADMINISTRATION
  • 2.1 Generalized Anxiety Disorder
  • 2.2 Panic Disorder
  • 2.3 Dosing in Special Populations
  • 2.4 Instructions to be Given to Patients for Use/Handling Alprazolam Orally Disintegrating Tablet
• 3 DOSAGE FORMS AND STRENGTHS
• 4 ALPRAZOLAM CONTRAINDICATIONS
• 5 WARNINGS AND PRECAUTIONS
  • 5.1 Suicide and Overdose
  • 5.2 Status Epilepticus
  • 5.3 Dependence and Withdrawal Reactions, Including Seizures
  • 5.4 Risk of Fetal Harm
  • 5.5 CNS Depression and Impaired Performance
  • 5.6 Mania
  • 5.7 Alprazolam Interaction with Drugs that Inhibit Metabolism via Cytochrome P450 3A
  • 5.8 Interdose Symptoms
  • 5.9 Risk of Dose Reduction
  • 5.10 Uricosuric Effect
  • 5.11 Use in Patients with Concomitant Illness
• 6 ALPRAZOLAM ADVERSE REACTIONS
  • 6.1 Clinical Trial Experience
  • 6.2 Postmarketing Experience
• 7 DRUG INTERACTIONS
  • 7.1Use with Other CNS Depressants
  • 7.2 Drugs Effecting Salivary Flow and Stomach pH
  • 7.3 Use with Imipramine and Desipramine
  • 7.4 Drugs that Inhibit Alprazolam Metabolism via Cytochrome P450 3A
  • 7.5 Drugs Demonstrated to be CYP3A Inhibitors of Possible Clinical Significance on the Basis of Clinical Studies Involving Alprazolam
  • 7.6 Drugs and Other Substances Demonstrated to be CYP3A Inhibitors on the Basis of Clinical Studies Involving Benzodiazepines Metabolized Similarly to Alprazolam or on the Basis of In Vitro Studies with Alprazolam or Other Benzodiazepines
  • 7.7 Inducers of CYP3A
• 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
• 9 DRUG ABUSE AND DEPENDENCE
  • 9.1 Controlled Substance
  • 9.3 Dependence
• 10 OVERDOSAGE
  • 10.1 Human Clinical Experience
  • 10.2 Management of Overdose
• 11 ALPRAZOLAM DESCRIPTION
  • 11.1 Alprazolam Orally Disintegrating Tablets
• 12 CLINICAL PHARMACOLOGY
  • 12.1 Mechanism of Action
  • 12.3 Pharmacokinetics
• 13 NONCLINICAL TOXICOLOGY
  • 13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility
  • 13.2 Animal Toxicology And/Or Pharmacology
• 14 CLINICAL STUDIES
  • 14.1 Anxiety Disorders
  • 14.2 Panic Disorder
• 16 HOW SUPPLIED/STORAGE AND HANDLING
• 17 PATIENT COUNSELING INFORMATION
  • 17.1 Counseling Information For All Users of Alprazolam
  • 17.2 Additional Counseling Information for Panic Disorder Patients
• PRINCIPAL DISPLAY PANEL 0.25 MG TABS CARTON
• PRINCIPAL DISPLAY PANEL 0.25 MG TABS FOIL SEAL
• PRINCIPAL DISPLAY PANEL 0.5 MG TABS CARTON
• PRINCIPAL DISPLAY PANEL 0.5 MG TABS FOILSEAL
• PRINCIPAL DISPLAY PANEL 1 MG TABS CARTON
• PRINCIPAL DISPLAY PANEL 1 MG TABS FOILSEAL
• PRINCIPAL DISPLAY PANEL 2 MG TABS CARTON
• PRINCIPAL DISPLAY PANEL 2 MG TABS FOILSEAL

FULL PRESCRIBING INFORMATION

1 INDICATIONS AND USAGE

1.1 Generalized Anxiety Disorder

Alprazolam is indicated for the treatment of generalized anxiety disorder.

The efficacy of alprazolam in the treatment of generalized anxiety disorder was demonstrated in 5 short-term, placebo-controlled trials. [see Clinical Studies ( 14.1 )]

1.2 Panic Disorder

Alprazolam is also indicated for the treatment of panic disorder, with or without agoraphobia.

The efficacy of alprazolam in the treatment of panic disorder was established in 2 short-term, placebo-controlled trials. [see Clinical Studies ( 14.2 )].

Demonstrations of the effectiveness of Alprazolam by systematic clinical study are limited to 4 months in duration for generalized anxiety disorder and 4 to 10 weeks duration for panic disorder; however, patients with panic disorder have been treated on an open basis for up to 8 months without apparent loss of benefit. The physician should periodically reassess the usefulness of the drug for the individual patient.

2 DOSAGE AND ADMINISTRATION

Dosage should be individualized for maximum beneficial effect. While the usual daily dosages given below will meet the needs of most patients, there will be some who require doses greater than 4 mg per day. In such cases, the dosage should be increased cautiously to avoid adverse reactions. In general, benzodiazepines should be prescribed for short periods. Reevaluate the need for continued therapy before extending the treatment period.

2.1 Generalized Anxiety Disorder

Initiate treatment with a dose of 0.25 mg to 0.5 mg three times daily. The dose may be increased to achieve a maximum therapeutic effect, at intervals of 3 to 4 days, to a maximum daily dose of 4 mg, given in divided doses. Use the lowest possible effective dose, and periodically reassess the need for continued treatment. The risk of dependence can increase with dose and duration of treatment.

The dosage should be reduced gradually when discontinuing therapy or when decreasing the daily dosage. Although there are no systematically collected data to support a specific discontinuation schedule, it is suggested that the daily dosage be decreased by no more than 0.5 mg every 3 days. Some patients may require an even slower dosage reduction.

2.2 Panic Disorder

The successful treatment of many panic disorder patients has required the use of alprazolam at doses greater than 4 mg daily. In controlled trials conducted to establish the efficacy of alprazolam in panic disorder, doses in the range of 1 mg to 10 mg daily were used. The mean dosage employed was approximately 5 mg to 6 mg daily. Among the approximately 1700 patients participating in the panic disorder development program, about 300 received alprazolam in dosages of greater than 7 mg per day, including approximately 100 patients who received maximum dosages of greater than 9 mg per day. Occasional patients required as much as 10 mg a day to achieve a successful response.

Dose Titration

Initiate treatment with a dose of 0.5 mg three times daily. Depending on the response, the dose may be increased at intervals of 3 to 4 days in increments of no more than 1 mg per day. Slower titration to the dose levels greater than 4 mg per day may be advisable to allow full expression of the pharmacodynamic effect of alprazolam. To lessen the possibility of interdose symptoms, the times of administration should be distributed as evenly as possible throughout the waking hours, (i.e., administered three or four times daily).

Generally, therapy should be initiated at a low dose to minimize the risk of adverse responses in patients especially sensitive to the drug. The dose should be advanced until an acceptable therapeutic response (i.e., a substantial reduction in or total elimination of panic attacks) is achieved, intolerance occurs, or the maximum recommended dose is attained.

Dose Maintenance

For patients receiving doses greater than 4 mg per day, periodically reassess treatment and consider a reduction of dosage. In a controlled postmarketing dose-response study, patients treated with doses of alprazolam greater than 4 mg per day for 3 months were able to taper to 50% of their total daily maintenance dose without apparent loss of clinical benefit. Because of the danger of withdrawal, avoid abrupt discontinuation of treatment. [see WARNINGS AND PRECAUTIONS (5.3), Drug Abuse and Dependence (9.3 )].

The necessary duration of treatment for panic disorder patients responding to alprazolam is unknown. After a period of extended freedom from attacks, a carefully supervised tapered discontinuation may be attempted, but there is evidence that this may often be difficult to accomplish without recurrence of symptoms and/or the manifestation of withdrawal phenomena.

Dose Reduction

Because of the danger of withdrawal, abrupt discontinuation of treatment should be avoided [see WARNINGS AND PRECAUTIONS (5.3), Drug Abuse and Dependence (9.3 )].

In all patients, dosage should be reduced gradually when discontinuing therapy or when decreasing the daily dosage. Although there are no systematically collected data to support a specific discontinuation schedule, it is suggested that the daily dosage be decreased by no more than 0.5 mg every three days. Some patients may require an even slower dosage reduction.

In any case, reduction of dose must be undertaken under close supervision and must be gradual. If significant withdrawal symptoms develop, reinstitute the previous stable dosing schedule. After stabilization, consider using a less rapid schedule of discontinuation. In a controlled postmarketing discontinuation study of panic disorder patients which compared this recommended taper schedule with a slower taper schedule, there was no difference between the groups in the proportion of patients who tapered and completely discontinued treatment with alprazolam; however, the slower schedule was associated with a reduction in symptoms associated with a withdrawal syndrome. Reduce the dose by no more than 0.5 mg every 3 days. Some patients may benefit from an even more gradual discontinuation. Some patients may prove resistant to all discontinuation regimens.

2.3 Dosing in Special Populations

In elderly patients, in patients with advanced liver disease, or in patients with debilitating disease (e.g., severe pulmonary disease), the usual starting dose is 0.25 mg, given two or three times daily. This may be gradually increased if needed and tolerated. The elderly may be especially sensitive to the effects of benzodiazepines. If adverse reactions occur at the recommended starting dose, the dose may be lowered.

2.4 Instructions to be Given to Patients for Use/Handling Alprazolam Orally Disintegrating Tablet

Just prior to administration, with dry hands, remove the tablet from the blister. Immediately place the Alprazolam Orally Disintegrating Tablet on top of the tongue where it will disintegrate and be swallowed with saliva. Administration with liquid is not necessary.

3 DOSAGE FORMS AND STRENGTHS

0.25 mg, 0.5 mg, 1 mg, or 2 mg scored orally disintegrating tablets ( 3 )

4 CONTRAINDICATIONS

Alprazolam is contraindicated in patients with acute narrow angle glaucoma. Alprazolam can exacerbate narrow angle closure. Alprazolam may be used in patients with open angle glaucoma who are receiving appropriate therapy.

Alprazolam is contraindicated in patients treated with potent CYP3A4 inhibitors (e.g., ketoconazole and itraconazole), because these medications significantly impair the oxidative metabolism mediated by cytochrome P450 3A (CYP3A) and can increase alprazolam exposures [see Clinical Pharmacology ( 12.3 ), Warnings and Precautions ( 5.7 ), and Drug Interactions ( 7.4 )].

5 WARNINGS AND PRECAUTIONS

5.1 Suicide and Overdose

As with other psychotropic medications, the usual precautions with respect to administration of the drug and size of the prescription are indicated for severely depressed patients or those in whom there is reason to expect concealed suicidal ideation or plans. Panic disorder has been associated with primary and secondary major depressive disorders and increased reports of suicide among untreated patients.

5.2 Status Epilepticus

Withdrawal seizures have been reported in association with the discontinuation of alprazolam. In most cases, only a single seizure was reported; however, multiple seizures and status epilepticus were reported as well.

5.3 Dependence and Withdrawal Reactions, Including Seizures

Alprazolam is a Schedule IV controlled substance. The use of benzodiazepines, including alprazolam, may lead to physical and psychological dependence. In general, benzodiazepines should be prescribed for short periods. Even after relatively short-term use at the recommended doses, there is some risk of dependence and withdrawal symptoms [see Dependence (9.3 )].

Certain adverse clinical events, some life-threatening, are a direct consequence of physical dependence to alprazolam. These include a spectrum of withdrawal symptoms; the most important is seizure [see Dependence ( 9.3 )]. Spontaneous reporting system data suggest that the risk of dependence and its severity appear to be greater in patients treated with doses greater than 4 mg per day and for long periods (more than 12 weeks). However, in a controlled postmarketing discontinuation study of panic disorder patients, the duration of treatment (3 months compared to 6 months) had no effect on the ability of patients to taper to zero dose. In contrast, patients treated with doses of alprazolam greater than 4 mg per day had more difficulty tapering to zero dose than those treated with less than 4 mg per day.

The importance of dose and the risks of alprazolam as a treatment for panic disorder

Because the management of panic disorder often requires the use of average daily doses of alprazolam above 4 mg, the risk of dependence among panic disorder patients may be higher than that among those treated for less severe anxiety. Experience in randomized placebo-controlled discontinuation studies of patients with panic disorder showed a high rate of rebound and withdrawal symptoms in patients treated with alprazolam compared to placebo-treated patients.

Relapse or return of illness was defined as a return of symptoms characteristic of panic disorder (primarily panic attacks) to levels approximately equal to those seen at baseline before active treatment was initiated. Rebound refers to a return of symptoms of panic disorder to a level substantially greater in frequency, or more severe in intensity than seen at baseline. Withdrawal symptoms were identified as those which were generally not characteristic of panic disorder and which occurred for the first time more frequently during discontinuation than at baseline.

In a controlled clinical trial in which 63 patients were randomized to alprazolam and where withdrawal symptoms were specifically sought, the following were identified as symptoms of withdrawal: heightened sensory perception, impaired concentration, dysosmia, clouded sensorium, paresthesias, muscle cramps, muscle twitch, diarrhea, blurred vision, appetite decrease, and weight loss. Other symptoms, such as anxiety and insomnia, were frequently seen during discontinuation, but it could not be determined if they were due to return of illness, rebound, or withdrawal.

In two controlled trials of 6 to 8 weeks duration where the ability of patients to discontinue medication was measured, 71% to 93% of patients treated with alprazolam tapered completely off therapy compared to 89% to 96% of placebo-treated patients. In a controlled postmarketing discontinuation study of panic disorder patients, the duration of treatment (3 months compared to 6 months) had no effect on the ability of patients to taper to zero dose.

Seizures attributable to alprazolam were seen after drug discontinuance or dose reduction in 8 of 1980 patients with panic disorder or in patients participating in clinical trials where doses of alprazolam greater than 4 mg/day for over 3 months were permitted. Five of these cases clearly occurred during abrupt dose reduction, or discontinuation from daily doses of 2 mg to 10 mg. Three cases occurred in situations where there was not a clear relationship to abrupt dose reduction or discontinuation. In one instance, seizure occurred after discontinuation from a single dose of 1 mg after tapering at a rate of 1 mg every 3 days from 6 mg daily. In two other instances, the relationship to taper is indeterminate; in both of these cases the patients had been receiving doses of 3 mg daily prior to seizure. The duration of use in the above 8 cases ranged from 4 to 22 weeks. There have been occasional voluntary reports of patients developing seizures while apparently tapering gradually from alprazolam. The risk of seizure seems to be greatest 24 to 72 hours after discontinuation [see DOSAGE AND ADMINISTRATION (2)].

To discontinue treatment in patients taking alprazolam, the dosage should be reduced gradually. Decrease the daily dosage of alprazolam by no more than 0.5 mg every three days [see DOSAGE AND ADMINISTRATION (2)]. Some patients may benefit from an even slower dosage reduction. In a controlled postmarketing discontinuation study of panic disorder patients which compared this recommended taper schedule with a slower taper schedule, no difference was observed between the groups in the proportion of patients who tapered to zero dose; however, the slower schedule was associated with a reduction in symptoms associated with a withdrawal syndrome.

5.4 Risk of Fetal Harm

Benzodiazepines can potentially cause fetal harm when administered to pregnant women. If alprazolam is used during pregnancy, or if the patient becomes pregnant while taking this drug, the patient should be apprised of the potential hazard to the fetus. Because of experience with other members of the benzodiazepine class, alprazolam is assumed to be capable of causing an increased risk of congenital abnormalities when administered to a pregnant woman during the first trimester. Because use of these drugs is rarely a matter of urgency, their use during the first trimester should almost always be avoided. The possibility that a woman of childbearing potential may be pregnant at the time of institution of therapy should be considered. Patients should be advised that if they become pregnant during therapy or intend to become pregnant they should communicate with their physicians about the desirability of discontinuing the drug.

5.5 CNS Depression and Impaired Performance

Because alprazolam has CNS depressant effects and has the potential to impair judgment, cognition, and motor performance, caution patients against engaging in hazardous occupations or activities requiring complete mental alertness such as operating machinery or driving a motor vehicle, until they are reasonably certain that alprazolam treatment does not affect them adversely. Caution patients about the simultaneous ingestion of alcohol and other CNS depressant drugs during treatment with alprazolam.

5.6 Mania

Episodes of hypomania and mania have been reported in association with the use of alprazolam in patients with depression.

5.7 Alprazolam Interaction with Drugs that Inhibit Metabolism via Cytochrome P450 3A

The initial step in alprazolam metabolism is hydroxylation catalyzed by cytochrome P450 3A (CYP3A). Drugs that inhibit this metabolic pathway may have a profound effect on the clearance of alprazolam. Consequently, alprazolam should be avoided in patients receiving potent inhibitors of CYP3A. With drugs inhibiting CYP3A to a lesser but still significant degree, alprazolam should be used only with caution and consideration of appropriate dosage reduction. For some drugs, an interaction with alprazolam has been quantified with clinical data; for other drugs, interactions are predicted from in vitro data and/or experience with similar drugs in the same pharmacologic class.

The following are examples of drugs known to inhibit the metabolism of alprazolam and/or related benzodiazepines, presumably through inhibition of CYP3A.

Potent CYP3A Inhibitors

Azole antifungal agents— Ketoconazole and itraconazole are potent CYP3A inhibitors and have been shown in vivo to increase plasma alprazolam concentrations 3.98 fold and 2.70 fold, respectively. The coadministration of alprazolam with these agents is not recommended. Other azole-type antifungal agents should also be considered potent CYP3A inhibitors and the coadministration of alprazolam with them is not recommended [see CONTRAINDICATIONS (4)].

Drugs demonstrated to be CYP3A inhibitors on the basis of clinical studies involving alprazolam

Consider dose reduction of alprazolam during coadministration with the following drugs:

• Nefazodone — Coadministration of nefazodone increased alprazolam concentration two-fold.
• Fluvoxamine — Coadministration of fluvoxamine approximately doubled the maximum plasma concentration of alprazolam, decreased clearance by 49%, increased half-life by 71%, and decreased measured psychomotor performance.
• Cimetidine — Coadministration of cimetidine increased the maximum plasma concentration of alprazolam by 86%, decreased clearance by 42%, and increased half-life by 16%.

Other drugs possibly affecting alprazolam metabolism

Other drugs possibly affect alprazolam metabolism by inhibition of CYP3A [see Drug Interactions (7.6 )]

5.8 Interdose Symptoms

Early morning anxiety and emergence of anxiety symptoms between doses of alprazolam have been reported in patients with panic disorder taking prescribed maintenance doses of alprazolam. These symptoms may reflect the development of tolerance or a time interval between doses which is longer than the duration of clinical action of the administered dose. In either case, it is presumed that the prescribed dose is not sufficient to maintain plasma levels above those needed to prevent relapse, rebound or withdrawal symptoms over the entire course of the interdosing interval. In these situations, it is recommended that the same total daily dose be given divided as more frequent administrations [see DOSAGE AND ADMINISTRATION (2 )].

5.9 Risk of Dose Reduction

Withdrawal reactions may occur when dosage reduction occurs for any reason. This includes purposeful tapering, but also inadvertent reduction of dose (e.g., the patient forgets, the patient is admitted to a hospital). Therefore, the dosage of alprazolam should be reduced or discontinued gradually [see DOSAGE AND ADMINISTRATION (2 )].

5.10 Uricosuric Effect

Alprazolam has a weak uricosuric effect. Although other medications with weak uricosuric effect have been reported to cause acute renal failure, there have been no reported instances of acute renal failure attributable to therapy with alprazolam.

5.11 Use in Patients with Concomitant Illness

It is recommended that the dosage be limited to the smallest effective dose to preclude the development of ataxia or oversedation which may be a particular problem in elderly or debilitated patients. [see DOSAGE AND ADMINISTRATION (2 )]. The usual precautions in treating patients with impaired renal, hepatic or pulmonary function should be observed. There have been rare reports of death in patients with severe pulmonary disease shortly after the initiation of treatment with alprazolam. A decreased systemic alprazolam elimination rate (e.g., increased plasma half-life) has been observed in both alcoholic liver disease patients and obese patients receiving alprazolam [see CLINICAL PHARMACOLOGY (12 )].

6 ADVERSE REACTIONS

6.1 Clinical Trial Experience

The most commonly reported (>5% and ~ twice the rate of placebo) adverse reactions with alprazolam treatment are: sedation, impaired coordination, dysarthria, and increased libido.

The data cited in the two tables below are estimates of adverse reactions occurring in patients who participated in clinical trials under the following conditions: relatively short duration (four weeks) placebo-controlled clinical studies with dosages up to 4 mg per day of (for the management of anxiety disorders or for the short-term relief of the symptoms of anxiety) and short-term (up to ten weeks) placebo-controlled clinical studies with dosages up to 10 mg per day of in patients with panic disorder, with or without agoraphobia.

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.

Comparison of the cited figures, however, can provide the prescriber with some basis for estimating the relative contributions of drug and non-drug factors to the adverse reaction incidence in the population studied. Even this use must be approached cautiously, as a drug may relieve a symptom in one patient but induce it in others. (For example, an anxiolytic drug may relieve dry mouth [a symptom of anxiety] in some subjects but induce dry mouth in others.)

In addition to the relatively common (i.e., greater than 1%) adverse reactions described in the table above, the following adverse reactions have been reported in association with the use of benzodiazepines: dystonia, irritability, concentration difficulties, anorexia, transient amnesia or memory impairment, loss of coordination, fatique, seizures, sedation, slurred speech, jaundice, musculoskeletal weakness, pruritus, diplopia, dysarthria, changes in libido, menstrual irregularities, incontinence and urinary retention.

In addition to the relatively common (i.e., greater than 1%) adverse reactions described in the table above, the following adverse reactions have been reported in association with the use of alprazolam: seizures, hallucinations, depersonalization, taste alterations, diplopia, elevated bilirubin, elevated enzymes and jaundice.

Panic disorder has been associated with primary and secondary major depressive and increased reports of suicide among untreated patients [ see Warnings and Precautions, (5.1) ].

6.2 Postmarketing Experience

The following adverse reactions have been identified during postmarketing use of alprazolam. 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. Reported events include: liver enzyme elevations, hepatitis, hepatic failure, Stevens-Johnson syndrome, hyperprolactinemia, gynecomastia, and galactorrhea

7 DRUG INTERACTIONS

7.1Use with Other CNS Depressants

If is coadministered with other psychotropic agents or anticonvulsant drugs, carefully consider the pharmacology of the agents to be employed, particularly with compounds which might potentiate the action of benzodiazepines. The benzodiazepines, including alprazolam, produce additive CNS depressant effects when co-administered with other psychotropic medications, anticonvulsants, antihistaminics, alcohol and other drugs which themselves produce CNS depression.

7.2 Drugs Effecting Salivary Flow and Stomach pH

Because alprazolam disintegrates in the presence of saliva, and the formulation requires an acidic environment to dissolve, concomitant drugs or diseases that cause dry mouth or raise stomach pH might slow disintegration or dissolution, resulting in slowed or decreased absorption.

7.3 Use with Imipramine and Desipramine

The steady state plasma concentrations of imipramine and desipramine can increase by approximately 30% and 20%, respectively, when administered concomitantly with alprazolam in doses up to 4 mg per day. The clinical significance of these changes is unknown.

7.4 Drugs that Inhibit Alprazolam Metabolism via Cytochrome P450 3A

The initial step in alprazolam metabolism is hydroxylation catalyzed by cytochrome P450 3A (CYP3A). Drugs which inhibit this metabolic pathway can have a profound effect on the clearance of alprazolam [see CONTRAINDICATIONS (4) and Warnings and Precautions (5.7)].

7.5 Drugs Demonstrated to be CYP3A Inhibitors of Possible Clinical Significance on the Basis of Clinical Studies Involving Alprazolam

Use caution during coadministration alprazolam and the following drugs:

Fluoxetine — Coadministration of fluoxetine with alprazolam increased the maximum plasma concentration of alprazolam by 46%, decreased clearance by 21%, increased half-life by 17%, and decreased measured psychomotor performance.

Propoxyphene — Coadministration of propoxyphene decreased the maximum plasma concentration of alprazolam by 6%, decreased clearance by 38%, and increased half-life by 58%.

Oral Contraceptives — Coadministration of oral contraceptives increased the maximum plasma concentration of alprazolam by 18%, decreased clearance by 22%, and increased half-life by 29%.

7.6 Drugs and Other Substances Demonstrated to be CYP3A Inhibitors on the Basis of Clinical Studies Involving Benzodiazepines Metabolized Similarly to Alprazolam or on the Basis of In Vitro Studies with Alprazolam or Other Benzodiazepines

Use caution during the coadministration of alprazolam and the following:

Available data from clinical studies of benzodiazepines other than alprazolam suggest a possible drug interaction between alprazolam and the following: diltiazem, isoniazid, macrolide antibiotics such as erythromycin and clarithromycin, and grapefruit juice. Data from in vitro studies of alprazolam suggest a possible drug interaction between alprazolam and the following: sertraline and paroxetine. However, data from an in vivo drug interaction study involving a single dose of alprazolam 1 mg and steady state doses of sertraline (50 mg to 150 mg per day) did not reveal any clinically significant changes in the pharmacokinetics of alprazolam. Data from in vitro studies of benzodiazepines other than alprazolam suggest a possible drug interaction between benzodiazepines and the following: ergotamine, cyclosporine, amiodarone, nicardipine, and nifedipine. [see Warnings and Precautions (5.7 )].

7.7 Inducers of CYP3A

Carbamazepine can increase alprazolam metabolism and therefore can decrease plasma levels of alprazolam.

8 USE IN SPECIFIC POPULATIONS

8.1 Pregnancy

Teratogenic Effects

Pregnancy Category D.

Benzodiazepines can potentially cause fetal harm when administered to a pregnant woman. The possibility that a woman of childbearing potential may be pregnant at the time of institution of therapy should be considered. If alprazolam is used during pregnancy, or if the patient becomes pregnant while taking this drug, the patient should be apprised of the potential hazard to the fetus. Because of experience with other members of the benzodiazepine class, alprazolam is assumed to be capable of causing an increased risk of congenital abnormalities when administered to a pregnant woman during the first trimester. Because use of these drugs is rarely a matter of urgency, their use during the first trimester should almost always be avoided [see Warnings and Precautions (5.4)].

Nonteratogenic Effects: It should be considered that the child born of a mother who is receiving benzodiazepines may be at some risk for withdrawal symptoms from the drug during the postnatal period. Also, neonatal flaccidity and respiratory problems have been reported in children born of mothers who have been receiving benzodiazepines.

8.2 Labor And Delivery

The potential effect of alprazolam in labor and delivery in humans has not been studied. However, perinatal complications have been reported in neonates exposed to benzodiazepines late in pregnancy. The findings are suggestive of excess benzodiazepine exposure or withdrawal phenomena.

8.3 Nursing Mothers

Benzodiazepines are excreted in human milk. It should be assumed that alprazolam is excreted in human milk. Chronic administration of diazepam to nursing mothers has been reported to cause their infants to become lethargic and to lose weight. Because of the potential for serious adverse reactions in nursing infants from alprazolam, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother. As a general rule, nursing should not be undertaken by mothers who must use alprazolam.

8.4 Pediatric Use

Safety and effectiveness of alprazolam in individuals below 18 years of age have not been established.

8.5 Geriatric Use

The elderly may be more sensitive to the effects of benzodiazepines. They exhibit higher plasma alprazolam concentrations due to reduced clearance of the drug as compared with a younger population receiving the same doses. The smallest effective dose of alprazolam should be used in the elderly to preclude the development of ataxia and oversedation (see CLINICAL PHARMACOLOGY (12) and DOSAGE AND ADMINISTRATION (2).

9 DRUG ABUSE AND DEPENDENCE

9.1 Controlled Substance

Alprazolam is a Schedule IV controlled substance.

9.3 Dependence

Withdrawal symptoms similar in character to those noted with sedative/hypnotics and alcohol have occurred following discontinuance of benzodiazepines, including alprazolam. The symptoms can range from mild dysphoria and insomnia to a major syndrome that may include abdominal and muscle cramps, vomiting, sweating, tremors and convulsions. Distinguishing between withdrawal emergent signs and symptoms and the recurrence of illness is often difficult in patients undergoing dose reduction. The long term strategy for treatment of these phenomena will vary with their cause and the therapeutic goal. When necessary, immediate management of withdrawal symptoms requires re-institution of treatment at doses of alprazolam sufficient to suppress symptoms. There have been reports of failure of other benzodiazepines to fully suppress these withdrawal symptoms. These failures have been attributed to incomplete cross-tolerance but may also reflect the use of an inadequate dosing regimen of the substituted benzodiazepine or the effects of concomitant medications.

While it is difficult to distinguish withdrawal from recurrence of anxiety symptoms, the time course and the nature of the symptoms may be helpful. A withdrawal syndrome typically includes the occurrence of new symptoms, tends to appear toward the end of taper or shortly after discontinuation, and will decrease with time. In recurring panic disorder, symptoms similar to those observed before treatment may recur either early or late, and they will persist.

While the severity and incidence of withdrawal phenomena appear to be related to dose and duration of treatment, withdrawal symptoms, including seizures, have been reported after only brief therapy with alprazolam at doses within the recommended range for the treatment of anxiety (e.g., 0.75 mg to 4 mg per day). Signs and symptoms of withdrawal are often more prominent after rapid decrease of dosage or abrupt discontinuance. The risk of withdrawal seizures may be increased at doses above 4 mg per day [see Warnings and Precautions (5.3 )].

Avoid abrupt discontinuation of alprazolam, especially in individuals with a history of seizures or epilepsy. It is recommended that all patients on alprazolam who require a dosage reduction be gradually tapered under close supervision [see Warnings and Precautions (5.3) and DOSAGE AND ADMINISTRATION (2)].

Psychological dependence is a risk with all benzodiazepines, including alprazolam. The risk of psychological dependence may also be increased at doses greater than 4 mg per day and with longer term use, and this risk is further increased in patients with a history of alcohol or drug abuse. Some patients have experienced considerable difficulty in tapering and discontinuing from alprazolam, especially those receiving higher doses for extended periods. Addiction-prone individuals should be under careful surveillance when receiving alprazolam. As with all anxiolytics, repeat prescriptions should be limited to those who are under medical supervision.

10 OVERDOSAGE

10.1 Human Clinical Experience

Manifestations of alprazolam overdosage include somnolence, confusion, impaired coordination, diminished reflexes and coma. Death has been reported in association with overdoses of alprazolam by itself, as it has with other benzodiazepines. In addition, fatalities have been reported in patients who have overdosed with a combination of a single benzodiazepine, including alprazolam, and alcohol; alcohol levels seen in some of these patients have been lower than those usually associated with alcohol-induced fatality.

10.2 Management of Overdose

For the most up to date information on management of alprazolam overdose, contact a certified poison center in your area (1-800-222-1222 or www.poison.org). In case of an overdose, provide supportive care, including close medical supervision and monitoring. Treatment should consist of those general measures employed in the management of overdosage with any drug. Consider the possibility of multiple drug overdose. Ensure an adequate airway, oxygenation, and ventilation. Monitor cardiac rhythm and vital signs. Use supportive and symptomatic measures.

Flumazenil, a specific benzodiazepine receptor antagonist, is indicated for the complete or partial reversal of the sedative effects of benzodiazepines and may be used in situations when an overdose with a benzodiazepine is known or suspected. Prior to the administration of flumazenil, necessary measures should be instituted to secure airway, ventilation and intravenous access. Flumazenil is intended as an adjunct to, not as a substitute for, proper management of benzodiazepine overdose. Patients treated with flumazenil should be monitored for re-sedation, respiratory depression, and other residual benzodiazepine effects for an appropriate period after treatment. The prescriber should be aware of a risk of seizure in association with flumazenil treatment, particularly in long-term benzodiazepine users and in cyclic antidepressant overdose. The complete flumazenil package insert including CONTRAINDICATIONS, WARNINGS and PRECAUTIONS should be consulted prior to use.

11 DESCRIPTION

Alprazolam orally disintegrating tablets contains alprazolam which is a triazolo analog of the 1,4 benzodiazepine class of central nervous system-active compounds.

Alprazolam orally disintegrating tablets is an orally administered formulation of alprazolam which rapidly disintegrates on the tongue and does not require water to aid dissolution or swallowing.

The chemical name of alprazolam is 8-Chloro-1-methyl-6-phenyl-4H-s-triazolo [4,3-α] [1,4] benzodiazepine. The empirical formula is C17H13CIN4 and the molecular weight is 308.76. The structural formula is: