Zolpidem Tartrate

1 INDICATIONS AND USAGE Zolpidem Tartrate Tablets is indicated for the short-term treatment of insomnia characterized by difficulties with sleep initiation. Zolpidem Tartrate Tablets has been shown to decrease sleep latency for up to 35 days in controlled clinical studies [see Clinical Studies ( 14 )]. The clinical trials performed in support of efficacy were 4–5 weeks in duration with the final formal assessments of sleep latency performed at the end of treatment. Zolpidem Tartrate Tablets, a gamma-aminobutyric acid (GABA) A receptor positive modulator, is indicated for the short-term treatment of insomnia characterized by difficulties with sleep initiation. ( 1 )

2 DOSAGE AND ADMINISTRATION Use the lowest dose effective for the patient and must not exceed a total of 10 mg daily ( 2.1 ) Treatment should be as short as possible ( 2.1 ) Recommended initial dose is a single dose of 5 mg for women and a single dose of 5 or 10 mg for men, immediately before bedtime with at least 7-8 hours remaining before the planned time of awakening ( 2.1 ) Geriatric patients and patients with mild to moderate hepatic impairment: Recommended dose is 5 mg for men and women ( 2.2 ) Lower doses of CNS depressants may be necessary when taken concomitantly with Zolpidem Tartrate Tablets ( 2.3 ) The effect of Zolpidem Tartrate Tablets may be slowed if taken with or immediately after a meal ( 2.4 ) 2.1 Dosage in Adults Use the lowest effective dose for the patient. The recommended initial dose is 5 mg for women and either 5 or 10 mg for men, taken only once per night immediately before bedtime with at least 7-8 hours remaining before the planned time of awakening. If the 5 mg dose is not effective, the dose can be increased to 10 mg. In some patients, the higher morning blood levels following use of the 10 mg dose increase the risk of next-day impairment of driving and other activities that require full alertness [see Warnings and Precautions ( 5.2 )] . The total dose of Zolpidem Tartrate Tablets should not exceed 10 mg once daily immediately before bedtime. Zolpidem Tartrate Tablets should be taken as a single dose and should not be readministered during the same night. The recommended initial doses for women and men are different because Zolpidem clearance is lower in women. Long-term use of Zolpidem Tartrate Tablets is not recommended. Treatment should be as short as possible. Extended treatment should not take place without re-evaluation of the patient's status because the risk of abuse and dependence increase with the duration of treatment [see Drug Abuse and Dependence ( 9.3 )] 2.2 Special Populations Elderly or debilitated patients may be especially sensitive to the effects of Zolpidem tartrate. The recommended dose of Zolpidem Tartrate Tablets in these patients is 5 mg once daily immediately before bedtime [see Warnings and Precautions ( 5.2 ), Use in Specific Populations ( 8.5 )]. Patients with mild to moderate hepatic impairment do not clear the drug as rapidly as normal subjects. The recommended dose of Zolpidem Tartrate Tablets in these patients is 5 mg once daily immediately before bedtime. Avoid Zolpidem Tartrate Tablets use in patients with severe hepatic impairment as it may contribute to encephalopathy [see Warnings and Precautions ( 5.8 ), Use in Specific Populations ( 8.7 ), Clinical Pharmacology ( 12.3 )]. 2.3 Use with CNS Depressants Dosage adjustment may be necessary when Zolpidem Tartrate Tablets is combined with other CNS-depressant drugs because of the potentially additive effects [see Warnings and Precautions ( 5.2 , 5.7 )]. 2.4 Administration The effect of Zolpidem Tartrate Tablets may be slowed by ingestion with or immediately after a meal.

6 ADVERSE REACTIONS The following serious adverse reactions are discussed in greater detail in other sections of the labeling: Complex Sleep Behaviors [see Warnings and Precautions ( 5.1 )] CNS-depressant effects and next-day impairment [see Warnings and Precautions ( 5.2 )] Severe anaphylactic and anaphylactoid reactions [see Warnings and Precautions ( 5.4 )] Abnormal thinking and behavior changes [see Warnings and Precautions ( 5.5 )] Withdrawal effects [see Warnings and Precautions ( 5.9 )] Most commonly observed adverse reactions were: Short-term (<10 nights): Drowsiness, dizziness, and diarrhea Long-term (28-35 nights): Dizziness and drugged feelings ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact ACI Healthcare USA, Inc. at 1- 888-802-1213.or www.acihealthcareusa.com or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch . 6.1 Clinical Trials Experience Associated with Discontinuation of Treatment Approximately 4% of 1,701 patients who received Zolpidem at all doses (1.25 to 90 mg) in U.S. premarketing clinical trials discontinued treatment because of an adverse reaction. Reactions most commonly associated with discontinuation from U.S. trials were daytime drowsiness (0.5%), dizziness (0.4%), headache (0.5%), nausea (0.6%), and vomiting (0.5%). Approximately 4% of 1,959 patients who received Zolpidem at all doses (1 to 50 mg) in similar foreign trials discontinued treatment because of an adverse reaction. Reactions most commonly associated with discontinuation from these trials were daytime drowsiness (1.1%), dizziness/vertigo (0.8%), amnesia (0.5%), nausea (0.5%), headache (0.4%), and falls (0.4%). Data from a clinical study in which selective serotonin reuptake inhibitor (SSRI)-treated patients were given Zolpidem revealed that four of the seven discontinuations during double-blind treatment with Zolpidem (n=95) were associated with impaired concentration, continuing or aggravated depression, and manic reaction; one patient treated with placebo (n=97) was discontinued after an attempted suicide. Most Commonly Observed Adverse Reactions in Controlled Trials During short-term treatment (up to 10 nights) with Zolpidem Tartrate Tablets at doses up to 10 mg, the most commonly observed adverse reactions associated with the use of Zolpidem and seen at statistically significant differences from placebo-treated patients were drowsiness (reported by 2% of Zolpidem patients), dizziness (1%), and diarrhea (1%). During longer-term treatment (28 to 35 nights) with Zolpidem at doses up to 10 mg, the most commonly observed adverse reactions associated with the use of Zolpidem and seen at statistically significant differences from placebo-treated patients were dizziness (5%) and drugged feelings (3%). Adverse Reactions Observed at an Incidence of ≥1% in Controlled Trials The following tables enumerate treatment-emergent adverse reactions frequencies that were observed at an incidence equal to 1% or greater among patients with insomnia who received Zolpidem Tartrate and at a greater incidence than placebo in U.S. placebo-controlled trials. Events reported by investigators were classified utilizing a modified World Health Organization (WHO) dictionary of preferred terms for the purpose of establishing event frequencies. The prescriber should be aware that these figures cannot be used to predict the incidence of side effects in the course of usual medical practice, in which patient characteristics and other factors differ from those that prevailed in these clinical trials. Similarly, the cited frequencies cannot be compared with figures obtained from other clinical investigators involving related drug products and uses, since each group of drug trials is conducted under a different set of conditions. However, the cited figures provide the physician with a basis for estimating the relative contribution of drug and nondrug factors to the incidence of side effects in the population studied. The following table was derived from results of 11 placebo-controlled short-term U.S. efficacy trials involving Zolpidem in doses ranging from 1.25 to 20 mg. The table is limited to data from doses up to and including 10 mg, the highest dose recommended for use. Table 1: Incidence of Treatment-Emergent Adverse Experiences in Placebo-Controlled Clinical Trials Lasting up to 10 Nights (percentage of patients reporting) Body System Adverse Event Reactions reported by at least 1% of patients treated with Zolpidem Tartrate Tablets and at a greater frequency than placebo. Zolpidem (≤10 mg) (N=685) Placebo (N=473) Central and Peripheral Nervous System Headache 7 6 Drowsiness 2 - Dizziness 1 - Gastrointestinal System Diarrhea 1 - The following table was derived from results of three placebo-controlled long-term efficacy trials involving Zolpidem Tartrate Tablets. These trials involved patients with chronic insomnia who were treated for 28 to 35 nights with Zolpidem at doses of 5, 10, or 15 mg. The table is limited to data from doses up to and including 10 mg, the highest dose recommended for use. The table includes only adverse events occurring at an incidence of at least 1% for Zolpidem patients. Table 2: Incidence of Treatment-Emergent Adverse Experiences in Placebo-Controlled Clinical Trials Lasting up to 35 Nights (percentage of patients reporting) Body System Adverse Event Reactions reported by at least 1% of patients treated with Zolpidem Tartrate Tablets and at a greater frequency than placebo. Zolpidem (≤10 mg) (N=152) Placebo (N=161) Autonomic Nervous System Dry mouth 3 1 Body as a Whole Allergy 4 1 Back Pain 3 2 Influenza-like symptoms 2 - Chest pain 1 - Cardiovascular System Palpitation 2 - Central and Peripheral Nervous System Drowsiness 8 5 Dizziness 5 1 Lethargy 3 1 Drugged feeling 3 - Lightheadedness 2 1 Depression 2 1 Abnormal dreams 1 - Amnesia 1 - Sleep disorder 1 - Gastrointestinal System Diarrhea 3 2 Abdominal pain 2 2 Constipation 2 1 Respiratory System Sinusitis 4 2 Pharyngitis 3 1 Skin and Appendages Rash 2 1 Dose Relationship for Adverse Reactions There is evidence from dose comparison trials suggesting a dose relationship for many of the adverse reactions associated with Zolpidem use, particularly for certain CNS and gastrointestinal adverse events. Adverse Event Incidence Across the Entire Preapproval Database Zolpidem Tartrate Tablets was administered to 3,660 subjects in clinical trials throughout the U.S., Canada, and Europe. Treatment-emergent adverse events associated with clinical trial participation were recorded by clinical investigators using terminology of their own choosing. To provide a meaningful estimate of the proportion of individuals experiencing treatment-emergent adverse events, similar types of untoward events were grouped into a smaller number of standardized event categories and classified utilizing a modified World Health Organization (WHO) dictionary of preferred terms. The frequencies presented, therefore, represent the proportions of the 3,660 individuals exposed to Zolpidem, at all doses, who experienced an event of the type cited on at least one occasion while receiving Zolpidem. All reported treatment-emergent adverse events are included, except those already listed in the table above of adverse events in placebo-controlled studies, those coding terms that are so general as to be uninformative, and those events where a drug cause was remote. It is important to emphasize that, although the events reported did occur during treatment with Zolpidem Tartrate Tablets, they were not necessarily caused by it. Adverse events are further classified within body system categories and enumerated in order of decreasing frequency using the following definitions: frequent adverse events are defined as those occurring in greater than 1/100 subjects; infrequent adverse events are those occurring in 1/100 to 1/1,000 patients; rare events are those occurring in less than 1/1,000 patients. Autonomic nervous system: Infrequent: increased sweating, pallor, postural hypotension, syncope. Rare: abnormal accommodation, altered saliva, flushing, glaucoma, hypotension, impotence, increased saliva, tenesmus. Body as a whole: Frequent: asthenia. Infrequent: edema, falling, fatigue, fever, malaise, trauma. Rare: allergic reaction, allergy aggravated, anaphylactic shock, face edema, hot flashes, increased ESR, pain, restless legs, rigors, tolerance increased, weight decrease. Cardiovascular system: Infrequent: cerebrovascular disorder, hypertension, tachycardia. Rare: angina pectoris, arrhythmia, arteritis, circulatory failure, extrasystoles, hypertension aggravated, myocardial infarction, phlebitis, pulmonary embolism, pulmonary edema, varicose veins, ventricular tachycardia. Central and peripheral nervous system: Frequent: ataxia, confusion, euphoria, headache, insomnia, vertigo Infrequent: agitation, anxiety, decreased cognition, detached, difficulty concentrating, dysarthria, emotional lability, hallucination, hypoesthesia, illusion, leg cramps, migraine, nervousness, paresthesia, sleeping (after daytime dosing), speech disorder, stupor, tremor. Rare: abnormal gait, abnormal thinking, aggressive reaction, apathy, appetite increased, decreased libido, delusion, dementia, depersonalization, dysphasia, feeling strange, hypokinesia, hypotonia, hysteria, intoxicated feeling, manic reaction, neuralgia, neuritis, neuropathy, neurosis, panic attacks, paresis, personality disorder, somnambulism, suicide attempts, tetany, yawning. Gastrointestinal system: Frequent: dyspepsia, hiccup, nausea. Infrequent: anorexia, constipation, dysphagia, flatulence, gastroenteritis, vomiting. Rare: enteritis, eructation, esophagospasm, gastritis, hemorrhoids, intestinal obstruction, rectal hemorrhage, tooth caries. Hematologic and lymphatic system: Rare: anemia, hyperhemoglobinemia, leukopenia, lymphadenopathy, macrocytic anemia, purpura, thrombosis. Immunologic system: Infrequent: infection. Rare: abscess herpes simplex herpes zoster, otitis externa, otitis media. Liver and biliary system: Infrequent: abnormal hepatic function, increased SGPT. Rare: bilirubinemia, increased SGOT. Metabolic and nutritional: Infrequent: hyperglycemia, thirst. Rare: gout, hypercholesteremia, hyperlipidemia, increased alkaline phosphatase, increased BUN, periorbital edema. Musculoskeletal system: Frequent: arthralgia, myalgia. Infrequent: arthritis. Rare: arthrosis, muscle weakness, sciatica, tendinitis. Reproductive system: Infrequent: menstrual disorder, vaginitis. Rare: breast fibroadenosis, breast neoplasm, breast pain. Respiratory system: Frequent: upper respiratory infection, lower respiratory infection. Infrequent: bronchitis, coughing, dyspnea, rhinitis. Rare: bronchospasm, respiratory depression, epistaxis, hypoxia, laryngitis, pneumonia. Skin and appendages: Infrequent: pruritus. Rare: acne, bullous eruption, dermatitis, furunculosis, injection-site inflammation, photosensitivity reaction, urticaria. Special senses: Frequent: diplopia, vision abnormal. Infrequent: eye irritation, eye pain, scleritis, taste perversion, tinnitus. Rare: conjunctivitis, corneal ulceration, lacrimation abnormal, parosmia, photopsia. Urogenital system: Frequent: urinary tract infection. Infrequent: cystitis, urinary incontinence. Rare: acute renal failure, dysuria, micturition frequency, nocturia, polyuria, pyelonephritis, renal pain, urinary retention. 6.2 Postmarketing Experience The following adverse reactions have been identified during postapproval use of Zolpidem Tartrate 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. Liver and biliary system: acute hepatocellular, cholestatic or mixed liver injury with or without jaundice (i.e., bilirubin >2 × ULN, alkaline phosphatase ≥2 × ULN, transaminase ≥5 × ULN). Psychiatric disorders: delirium

12.3 Pharmacokinetics The pharmacokinetic profile of Zolpidem Tartrate Tablets is characterized by rapid absorption from the gastrointestinal tract and a short elimination half-life (T 1/2 ) in healthy subjects. In a single-dose crossover study in 45 healthy subjects administered 5 and 10 mg Zolpidem Tartrate Tablets, the mean peak concentrations (C max ) were 59 (range: 29 to 113) and 121 (range: 58 to 272) ng/mL, respectively, occurring at a mean time (T max ) of 1.6 hours for both. The mean Zolpidem Tartrate Tablets elimination half-life was 2.6 (range: 1.4 to 4.5) and 2.5 (range: 1.4 to 3.8) hours, for the 5 and 10 mg tablets, respectively. Zolpidem Tartrate Tablets is converted to inactive metabolites that are eliminated primarily by renal excretion. Zolpidem Tartrate Tablets demonstrated linear kinetics in the dose range of 5 to 20 mg. Total protein binding was found to be 92.5 ± 0.1% and remained constant, independent of concentration between 40 and 790 ng/mL. Zolpidem did not accumulate in young adults following nightly dosing with 20 mg Zolpidem Tartrate Tablets for 2 weeks. A food-effect study in 30 healthy male subjects compared the pharmacokinetics of Zolpidem Tartrate Tablets 10 mg when administered while fasting or 20 minutes after a meal. Results demonstrated that with food, mean AUC and C max were decreased by 15% and 25%, respectively, while mean T max was prolonged by 60% (from 1.4 to 2.2 hr). The half-life remained unchanged. These results suggest that, for faster sleep onset, Zolpidem Tartrate Tablets should not be administered with or immediately after a meal. Special Populations Elderly In the elderly, the dose for Zolpidem Tartrate Tablets should be 5 mg [see Warnings and Precautions ( 5 ), Dosage and Administration ( 2 )] . This recommendation is based on several studies in which the mean C max , T 1/2 , and AUC were significantly increased when compared to results in young adults. In one study of eight elderly subjects (>70 years), the means for C max , T 1/2 , and AUC significantly increased by 50% (255 vs 384 ng/mL), 32% (2.2 vs 2.9 hr), and 64% (955 vs 1,562 ng·hr/mL), respectively, as compared to younger adults (20 to 40 years) following a single 20 mg oral dose. Zolpidem Tartrate Tablets did not accumulate in elderly subjects following nightly oral dosing of 10 mg for 1 week. Hepatic impairment The pharmacokinetics of Zolpidem Tartrate Tablets in eight patients with chronic hepatic insufficiency was compared to results in healthy subjects. Following a single 20 mg oral ZOLPIDEM Tartrate dose, mean C max and AUC were found to be two times (250 vs 499 ng/mL) and five times (788 vs 4,203 ng·hr/mL) higher, respectively, in hepatically compromised patients. T max did not change. The mean half-life in cirrhotic patients of 9.9 hr (range: 4.1 to 25.8 hr) was greater than that observed in normal subjects of 2.2 hr (range: 1.6 to 2.4 hr) [see Dosage and Administration ( 2.2 ), Warnings and Precautions ( 5.8 ), Use in Specific Populations ( 8.7 )]. Renal impairment The pharmacokinetics of Zolpidem Tartrate was studied in 11 patients with end-stage renal failure (mean Cl Cr = 6.5 ± 1.5 mL/min) undergoing hemodialysis three times a week, who were dosed with Zolpidem Tartrate 10 mg orally each day for 14 or 21 days. No statistically significant differences were observed for C max , T max , half-life, and AUC between the first and last day of drug administration when baseline concentration adjustments were made. Zolpidem was not hemodialyzable. No accumulation of unchanged drug appeared after 14 or 21 days. Zolpidem pharmacokinetics was not significantly different in renally impaired patients. No dosage adjustment is necessary in patients with compromised renal function. Drug Interactions CNS-depressants Coadministration of Zolpidem with other CNS depressants increases the risk of CNS depression [see Warnings and Precautions ( 5.2 )] . Zolpidem Tartrate was evaluated in healthy volunteers in single-dose interaction studies for several CNS drugs. Imipramine in combination with Zolpidem produced no pharmacokinetic interaction other than a 20% decrease in peak levels of imipramine, but there was an additive effect of decreased alertness. Similarly, chlorpromazine in combination with Zolpidem produced no pharmacokinetic interaction, but there was an additive effect of decreased alertness and psychomotor performance. A study involving haloperidol and Zolpidem revealed no effect of haloperidol on the pharmacokinetics or pharmacodynamics of Zolpidem. The lack of a drug interaction following single-dose administration does not predict the absence of an effect following chronic administration. An additive adverse effect on psychomotor performance between alcohol and oral Zolpidem was demonstrated [see Warnings and Precautions ( 5.2 )]. Following five consecutive nightly doses at bedtime of oral Zolpidem Tartrate 10 mg in the presence of sertraline 50 mg (17 consecutive daily doses, at 7:00 am, in healthy female volunteers), Zolpidem C max was significantly higher (43%) and T max was significantly decreased (-53%). Pharmacokinetics of sertraline and N-desmethylsertraline were unaffected by Zolpidem. A single-dose interaction study with Zolpidem Tartrate 10 mg and fluoxetine 20 mg at steady-state levels in male volunteers did not demonstrate any clinically significant pharmacokinetic or pharmacodynamic interactions. When multiple doses of Zolpidem and fluoxetine were given at steady state and the concentrations evaluated in healthy females, an increase in the Zolpidem half-life (17%) was observed. There was no evidence of an additive effect in psychomotor performance. Drugs that affect drug metabolism via cytochrome P450 Some compounds known to inhibit CYP3A may increase exposure to Zolpidem. The effect of inhibitors of other P450 enzymes on the pharmacokinetics of Zolpidem is unknown. A single-dose interaction study with Zolpidem Tartrate 10 mg and itraconazole 200 mg at steady- state levels in male volunteers resulted in a 34% increase in AUC 0-∞ of Zolpidem tartrate. There were no pharmacodynamic effects of Zolpidem detected on subjective drowsiness, postural sway, or psychomotor performance. A single-dose interaction study with Zolpidem Tartrate 10 mg and rifampin 600 mg at steady-state levels in female subjects showed significant reductions of the AUC (-73%), C max (-58%), and T 1/2 (-36 %) of Zolpidem together with significant reductions in the pharmacodynamic effects of Zolpidem tartrate. Rifampin, a CYP3A4 inducer, significantly reduced the exposure to and the pharmacodynamic effects of Zolpidem [see Drug Interactions ( 7.2 )]. Similarly, St. John's wort, a CYP3A4 inducer, may also decrease the blood levels of Zolpidem. A single-dose interaction study with Zolpidem Tartrate 5 mg and ketoconazole, a potent CYP3A4 inhibitor, given as 200 mg twice daily for 2 days increased C max of Zolpidem (30%) and the total AUC of Zolpidem (70%) compared to Zolpidem alone and prolonged the elimination half-life (30 %) along with an increase in the pharmacodynamic effects of Zolpidem [see Drug Interactions ( 7.2 )]. Additionally, fluvoxamine (a strong inhibitor of CYP1A2 and a weak inhibitor of CYP3A4 and CYP2C9) and ciprofloxacin (a strong inhibitor of CYP1A2 and a moderate inhibitor of CYP3A4) are also likely to inhibit Zolpidem's metabolic pathways, potentially leading to an increase in Zolpidem exposure. Other drugs with no interactions with Zolpidem A study involving cimetidine/Zolpidem Tartrate and ranitidine/Zolpidem Tartrate combinations revealed no effect of either drug on the pharmacokinetics or pharmacodynamics of Zolpidem. Zolpidem Tartrate had no effect on digoxin pharmacokinetics and did not affect prothrombin time when given with warfarin in healthy subjects.