The product labeling information includes all published material associated to a drug. Product labeling documents include information like generic names, active ingredients, ingredient strength dosage, routes of administration, appearance, usage, warnings, inactive ingredients, etc.
1 Indications And Usage
Carisoprodol Tablets, USP are indicated for the relief of discomfort associated with acute, painful musculoskeletal conditions in adults.Carisoprodol Tablets, USP 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”.
Carisoprodol Tablets are contraindicated in patients with a history of acute intermittent porphyria or a hypersensitivity reaction to a carbamate such as meprobamate.
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 Tablets 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.
5.2 Abuse, Dependence And Withdrawal
Carisoprodol, the active ingredient in Carisoprodol Tablets, has been subject to abuse, dependence, withdrawal, misuse, and criminal diversion [see Drug Abuse and Dependence (9.1, 9.2, 9.3)]. Abuse of Carisoprodol Tablets poses a risk of overdosage which may lead to death, CNS and respiratory depression, hypotension, seizures, and other disorders [see OVERDOSAGE (10)]. Post-marketing experience cases of carisoprodol abuse and dependence have been reported in patients with prolonged use and a history of drug abuse. Although most of these patients took other drugs of abuse, some patients solely abused carisoprodol. Withdrawal symptoms have been reported following abrupt cessation of Carisoprodol Tablets after prolonged use. Reported withdrawal symptoms included insomnia, vomiting, abdominal cramps, headache, tremors, muscle twitching, ataxia, hallucinations, and psychosis. One of carisoprodol’s metabolites, meprobamate (a controlled substance), may also cause dependence [see CLINICAL PHARMACOLOGY (12.3)]. To reduce the risk of Carisoprodol Tablets abuse, assess the risk of abuse prior to prescribing. After prescribing, limit the length of treatment to three weeks for the relief of acute musculoskeletal discomfort, keep careful prescription records, monitor for signs of abuse and overdose, and educate patients and their families about abuse and on proper storage and disposal.
There have been post-marketing 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)].
6.1 Clinical Studies Experience
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 the trial. 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 StudyAdverse Reaction Placebo(n=560)n (%)Carisoprodol Tablets350 mg(n=279)n (%)Drowsiness 31 (6)47 (17)Dizziness 11 (2)19 (7)Headache 11 (2)9 (3)6.2
Post-marketing ExperienceThe following events have been reported during post-approval 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.Hematologic: Leukopenia, pancytopenia.To report SUSPECTED ADVERSE REACTIONS, contact West-Ward Pharmaceuticals Corp. at 1-877-233-2001 or the FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
7.1 Cns Depressants
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 Tablets and meprobamate, a metabolite of Carisoprodol Tablets, is not recommended [see WARNINGS AND PRECAUTIONS (5.1)].
7.2 Cyp2c19 Inhibitors And Inducers
Carisoprodol Tablets are metabolized in the liver by CYP2C19 to form meprobamate [see CLINICAL PHARMACOLOGY (12.3)]. 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.
8.1 Pregnancy: Pregnancy Category C.
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.
8.2 Labor And Delivery
There is no information about the effects of Carisoprodol Tablets on the mother and the fetus during labor and delivery.
8.3 Nursing Mothers
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.
8.4 Pediatric Use
The efficacy, safety, and pharmacokinetics of Carisoprodol Tablets in pediatric patients less than 16 years of age have not been established.
8.5 Geriatric Use
The efficacy, safety, and pharmacokinetics of Carisoprodol Tablets in patients over 65 years old have not been established.
8.6 Renal Impairment
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.
8.7 Hepatic Impairment
The safety and pharmacokinetics of Carisoprodol Tablets 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.
8.8 Patients With Reduced Cyp2c19 Activity
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)].
9.1 Controlled Substance
Carisoprodol Tablets contain carisoprodol, a Schedule IV controlled substance. Carisoprodol has been subject to abuse, misuse, and criminal diversion for nontherapeutic use [see WARNINGS AND PRECAUTIONS (5.2)].
Abuse of carisoprodol poses a risk of overdosage which may lead to death, CNS and respiratory depression, hypotension, seizures and other disorders [see WARNINGS AND PRECAUTIONS (5.2) and OVERDOSAGE (10)]. Patients at high risk of Carisoprodol Tablets abuse may include those with prolonged use of carisoprodol, with a history of drug abuse, or those who use Carisoprodol Tablets in combination with other abused drugs.Prescription drug abuse is the intentional non-therapeutic use of a drug, even once, for its rewarding psychological effects. Drug addiction, which develops after repeated drug abuse, is characterized by a strong desire to take a drug despite harmful consequences, difficulty in controlling its use, giving a higher priority to drug use than to obligations, increased tolerance, and sometimes physical withdrawal. Drug abuse and drug addiction are separate and distinct from physical dependence and tolerance (for example, abuse or addiction may not be accompanied by tolerance or physical dependence) [see DRUG ABUSE AND DEPENDENCE (9.3)].
Tolerance is when a patient’s reaction to a specific dosage and concentration is progressively reduced in the absence of disease progression, requiring an increase in the dosage to maintain the same. Physical dependence is characterized by withdrawal symptoms after abrupt discontinuation or a significant dose reduction of a drug. Both tolerance and physical dependence have been reported with the prolonged use of Carisoprodol Tablets. Reported withdrawal symptoms with Carisoprodol Tablets include insomnia, vomiting, abdominal cramps, headache, tremors, muscle twitching, anxiety, ataxia, hallucinations, and psychosis. Instruct patients taking large doses of Carisoprodol Tablets or those taking the drug for a prolonged time to not abruptly stop Carisoprodol Tablets [see WARNINGS AND PRECAUTIONS (5.2)].
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. Serotonin syndrome has been reported with carisoprodol intoxication. Many of the carisoprodol 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 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 Tablets 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 Carisoprodol Tablets overdose. Vomiting should not be induced because of the risk of CNS and respiratory depression, and subsequent aspiration.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.For decontamination in cases of severe toxicity, activated charcoal should be considered in a hospital setting in patients with large overdoses who present early and are not demonstrating CNS depression and can protect their airway. For more information on the management of an overdose of Carisoprodol Tablets, contact a Poison Control Center.
Carisoprodol Tablets, USP 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; and its solubility is practically independent of pH. Carisoprodol is present as a racemic mixture. Chemically, carisoprodol 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.
12.1 Mechanism Of Action
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 350 mg carisoprodol (see Table 2).The Cmax of meprobamate was 2.5 ± 0.5 mcg/mL (mean ± SD) after administration of a single 350 mg dose of carisoprodol, which is approximately 30% of the Cmax of meprobamate (approximately 8 mcg/mL) after administration of a single 400 mg dose of meprobamate.Table 2. Pharmacokinetic Parameters of Carisoprodol and Meprobamate (Mean ± SD, n=24)
Carisoprodol 350 mgCarisoprodol Cmax (µg/mL) 1.8 ± 1.0 AUCinf (mcg*hr/mL) 7.0 ± 5.0 Tmax (hr) 1.7 ± 0.8 T1/2 (hr) 2.0 ± 0.5Meprobamate Cmax (mcgmL) 2.5 ± 0.5 AUCinf (mcg*hr/mL) 46 ± 9.0 Tmax (hr) 4.5 ± 1.9 T1/2 (hr) 9.6 ± 1.5Absorption: Absolute bioavailability of carisoprodol has not been determined. The mean time to peak plasma concentrations (Tmax) 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%.
13.1 Carcinogenesis, Mutagenesis, Impairment Of Fertility
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 wasnot 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 Tablets were 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.
14 Clinical Studies
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. trial (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 two treatment groups (i.e., carisoprodol 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 the study.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 study are presented in Table 3.Table 3. Results of the Primary Efficacy Endpointsa in Study 1 Study Parameter PlaceboCarisoprodolTablets 350 mg 1Number of Patients n=269n=273Relief from Starting 1.4 (0.1)1.8 (0.1)Backache, Mean (SE)bDifference between Carisoprodol Tablets and Placebo, Mean (SE)b (95% Cl)0.4(0.2, 0.6)Global Impression of Change, Mean (SE)b1.9 (0.1)2.2 (0.1)Difference between Carisoprodol Tablets and Placebo, Mean (SE)b (95% Cl)0.3(0.1, 0.4)a 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).b 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/Storage And Handling
Carisoprodol Tablets, USP 350 mg, are White, Round, Unscored Tablets Imprinted “WW 176”, are available in:Bottles of 100 tabletsBottles of 500 tabletsBottles of 1000 tabletsStorage:Store at 20° to 25°C (68° to 77°F) [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.
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 Of 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 by:West-Ward Pharmaceuticals Corp.Eatontown, NJ 07724Revised July 2016
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