CARISOPRODOL- carisoprodol tablet
Carlsbad Technology, Inc.
HIGHLIGHTS OF PRESCRIBING INFORMATION
These highlights do not include all the information needed to use Caprisoprodol tablets, USP safely and effectively. See full prescribing information for Carisoprodol tablets USP.
Carisoprodol Tablets USP for Oral use, CIV
Initial U.S. Approval: 1959
INDICATIONS AND USAGE
DOSAGE AND ADMINISTRATION
Recommended dose is 250 mg to 350 mg three times a day and at bedtime. ( 2)
DOSAGE FORMS AND STRENGTHS
Tablets: 350 mg ( 3)
WARNINGS AND PRECAUTIONS
Most common adverse reactions (incidence > 2%) are drowsiness, dizziness, and headache ( 6.1)
To report SUSPECTED ADVERSE REACTIONS, contact Carlsbad Tech at 1(855) 397-9777 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
See 17 for PATIENT COUNSELING INFORMATION.
FULL PRESCRIBING INFORMATION: CONTENTS*
Carisoprodol tablets, USP is 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) ].
The recommended dose of carisoprodol tablets, USP is 250 mg to 350 mg three times a day and at bedtime. The recommended maximum duration of carisoprodol tablets, USP use is up to two or three weeks.
350 mg Tablets: white to off white circular biconvex tablets, debossed with logo-mark "OP" and product code "35" on one side and no mark on the other side.
Carisoprodol tablets, USP is contraindicated in patients with a history of acute intermittent porphyria or a hypersensitivity reaction to a carbamate such as meprobamate.
Carisoprodol has sedative properties (in the low back pain trials, 13% to 17% of patients who received carisoprodol 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.
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.
Carisoprodol, the active ingredient in carisoprodol tablets, USP, has been subject to abuse, dependence, and withdrawal, misuse and criminal diversion. [ see Drug Abuse and Dependence ( 9.1, 9.2, 9.3) ]. Abuse of carisoprodol tablets, USP 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 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, USP 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. Most of these cases have occurred in the setting of multiple drug overdoses (including drugs of abuse, illegal drugs, and alcohol) [ see Overdosage ( 10) ].
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 these studies, patients were treated with 250 mg of carisoprodol, 350 mg of carisoprodol, 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 these two studies, 2.7%, 2%, and 5.4%, of patients treated with placebo, 250 mg of carisoprodol, and 350 mg of carisoprodol, respectively, discontinued due to adverse events; and 0.5%, 0.5%, and 1.8% of patients treated with placebo, 250 mg of carisoprodol, and 350 mg of carisoprodol, 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 in the two trials described above.
(n=560) n (%)
|Carisoprodol 250 mg
(n=548) n (%)
|Carisoprodol 350 mg
(n=279) n (%)
|Drowsiness||31 (6)||73 (13)||47 (17)|
|Dizziness||11 (2)||43 (8)||19 (7)|
|Headache||11 (2)||26 (5)||9 (3)|
The following events have been reported during postapproval use of carisoprodol. 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
The sedative effects of carisoprodol 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 is 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 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 could result in decreased exposure of carisoprodol and increased exposure of meprobamate. Low dose aspirin also showed an induction effect on CYP2C19. The full pharmacological impact of these potential alterations of exposures in terms of either efficacy or safety of carisoprodol is unknown.
Data over many decades of carisoprodol use in pregnancy have not identified a
drug-associated risk of major birth defects, miscarriage, or other adverse maternal or
fetal outcomes. Data on meprobamate, the primary metabolite of carisoprodol, also do
not show a consistent association between maternal use of meprobamate and an
increased risk of major birth defects (see Data).
In a published animal reproduction study, pregnant mice administered carisoprodol
orally at 2.6- and 4.1-times the maximum recommended human dose ([MRHD] of
1400 mg per day [350 mg QID] based on body surface area [BSA] comparison) from
gestation through weaning resulted in reduced fetal weights, postnatal weight gain,
and postnatal survival (see Data).
The estimated background risk of major birth defects and miscarriage for the
indicated population is unknown. All pregnancies have a background risk of birth
defect, loss, or other adverse outcomes. In the U.S. general population, the estimated
background risk of major birth defects and miscarriage in clinically recognized
pregnancies is 2 to 4% and 15 to 20%, respectively.
Retrospective case-control and cohort studies of meprobamate use during the
first trimester of pregnancy have not consistently identified an increased risk or pattern
of major birth defects. For children exposed to meprobamate in-utero, one study found
no adverse effect on mental or motor development or IQ scores.
Embryofetal development studies in animals have not been completed.
In a published pre- and post-natal development animal study, pregnant mice
administered carisoprodol orally at 300, 750, or 1200 mg/kg/day (approximately 1-,
2.6-, and 4.1-times the MRHD based on BSA comparison) from 7-days prior to
gestation through birth and from lactation through weaning resulted in reduced fetal
weights, postnatal weight gain, and postnatal survival at 2.6- and 4.1-times the MRHD.
Infants exposed to carisoprodol through breast milk should be monitored for
Data from published literature report that carisoprodol and its metabolite,
meprobamate, are present in breastmilk. There are no data on the effect of carisoprodol
on milk production. There is one report of sedation in an infant who was breastfed by a
mother taking carisoprodol (see Clinical Considerations). Because there have been no
consistent reports of adverse events in breastfed infants over decades of use, the
developmental and health benefits of breastfeeding should be considered along with
the mother’s clinical need for carisoprodol and any potential adverse effects on the
breastfed infant from carisoprodol or from the underlying maternal condition.
The efficacy, safety, and pharmacokinetics of carisoprodol in pediatric patients less than 16 years of age have not been established.
The efficacy, safety, and pharmacokinetics of carisoprodol in patients over 65 years old have not been established.
The safety and pharmacokinetics of carisoprodol in patients with renal impairment have not been evaluated. Since carisoprodol is excreted by the kidney, caution should be exercised if carisoprodol is administered to patients with impaired renal function. Carisoprodol is dialyzable by hemodialysis and peritoneal dialysis.
The safety and pharmacokinetics of carisoprodol in patients with hepatic impairment have not been evaluated. Since carisoprodol is metabolized in the liver, caution should be exercised if carisoprodol is administered to patients with impaired hepatic function.
Patients with reduced CYP2C19 activity have higher exposure to carisoprodol. Therefore, caution should be exercised in administration of carisoprodol to these patients [ see Clinical Pharmacology ( 12.3) ].
Carisoprodol tablets, USP contains carisoprodol, USP 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 abuse may include those with prolonged use of carisoprodol, with a history of drug abuse, or those who use carisoprodol 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. Reported withdrawal symptoms with carisoprodol include insomnia, vomiting, abdominal cramps, headache, tremors, muscle twitching, anxiety, ataxia, hallucinations, and psychosis. Instruct patients taking large doses of carisoprodol or those taking the drug for a prolonged time to not abruptly stop carisoprodol [ see Warnings and Precautions ( 5.2) ].
Overdosage of carisoprodol 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 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 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 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, contact a Poison Control Center.
Carisoprodol tablets, USP are available as 350 mg round, white tablets. Carisoprodol USP is a white, crystalline powder, having a mild, characteristic odor. It is very 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 (±)-2-Methyl-2-propyl-1,3-propanediol carbamate
isopropylcarbamate and the molecular formula is C 12H 24N 2O 4, with a molecular weight of 260.33. The structural formula is:
Other ingredients in the carisoprodol tablets USP, 350 mg include microcrystalline cellulose, lactose monohydrate, maize starch, croscarmellose sodium, povidone, talc and magnesium stearate.
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 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 250 mg and 350 mg carisoprodol (see Table 2). The exposure of carisoprodol and meprobamate was dose proportional between the 250 mg and 350 mg doses. The C max of meprobamate was 2.5 ± 0.5 mcg/mL (mean ± SD) after administration of a single 350 mg dose of carisoprodol tablets, which is approximately 30% of the C max of meprobamate (approximately 8 mcg/mL) after administration of a single 400 mg dose of meprobamate.
|250 mg carisoprodol||350 mg carisoprodol|
|Cmax (mcg/mL)||1.2 ± 0.5||1.8 ± 1.0|
|AUCinf (mcg*hr/mL)||4.5 ± 3.1||7.0 ± 5.0|
|Tmax (hr)||1.5 ± 0.8||1.7 ± 0.8|
|T1/2 (hr)||1.7 ± 0.5||2.0 ± 0.5|
|Cmax (mcg/mL)||1.8 ± 0.3||2.5 ± 0.5|
|AUCinf (mcg*hr/mL)||32 ± 6.2||46 ± 9.0|
|Tmax (hr)||3.6 ± 1.7||4.5 ± 1.9|
|T1/2 (hr)||9.7 ± 1.7||9.6 ± 1.5|
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.
Food Effect: Co-administration of a high-fat meal with carisoprodol (350 mg tablet) had no effect on the pharmacokinetics of carisoprodol. Therefore, carisoprodol 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).
Excretion: 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% to 50% on a weight adjusted basis). Overall exposure of meprobamate is comparable between female and male subjects.
Sex: 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 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% to 5% and in Asians is approximately 15% to 20%.
Long term studies in animals have not been performed to evaluate the carcinogenic
potential of carisoprodol.
Carisoprodol was 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.
Impairment of Fertility
Carisoprodol was not formally evaluated for effects on fertility. A published
reproductive study in which female mice received carisoprodol orally at doses of 300,
750, or 1200 mg/kg/day (approximately 1, 2.6, and 4.1 times the MRHD of 1400 mg per
day [350 mg QID] based on body surface area [BSA] comparison) from 1-week prior to
mating, to 27-weeks post-mating 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 (maternal doses equivalent to 4.2-times the MRHD based on BSA
comparison). In both studies, the no effect level was 750 mg/kg/day, corresponding to
approximately 2.6- times the MRHD based on a BSA comparison. The significance of
these findings for human fertility is not known.
The safety and efficacy of carisoprodol for the relief of acute, idiopathic mechanical low back pain was evaluated in two, 7-day, double blind, randomized, multicenter, placebo controlled, U.S. trials (Studies 1 and 2). 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 250 mg, carisoprodol 350 mg, or placebo) and in Study 2 patients were randomized to two treatment groups (i.e., carisoprodol 250 mg or placebo). In both studies, 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.
aThe 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).
bMean is the least squared mean and SE is the standard error of the mean. The ANOVA model was used for the primary statistical comparison between the carisoprodol 250 mg and placebo groups.
|Study||Parameter||Placebo||carisoprodol 250 mg||carisoprodol 350 mg|
|1||Number of Patients||n=269||n=264||n=273|
|Relief from Starting Backache, Mean (SE)b||1.4 (0.1)||1.8 (0.1)||1.8 (0.1)|
|Difference between carisoprodol and Placebo, Mean (SE) b (95% CI)||0.4
|Global Impression of Change, Mean (SE)b||1.9 (0.1)||2.2 (0.1)||2.2 (0.1)|
|Difference between carisoprodol and Placebo, Mean (SE) b (95% CI)||0.2
|2||Number of Patients||n=278||n=269|
|Relief from Starting Backache, Mean (SE)b||1.1 (0.1)||1.8 (0.1)|
|Difference between carisoprodol and Placebo, Mean (SE) b (95% CI)||0.7
|Global Impression of Change, Mean (SE)b||1.7 (0.1)||2.2 (0.1)|
|Difference between carisoprodol and Placebo, Mean (SE) b (95% CI)||0.5
Patients treated with carisoprodol experienced improvement in function as measured by the Roland-Morris Disability Questionnaire (RMDQ) score on Days 3 and 7.
Carisoprodol Tablets, USP 350 mg: round, biconvex, white tablets, debossed with OP 35 on one side; available in bottles of 100 (NDC 61442-451-01), available in bottles of 500 (NDC 61442-451-05), available in bottles of 1000 (NDC 61442-451-10).
Patients should be advised to contact their physician if they experience any adverse reactions to carisoprodol.
Advise patients that carisoprodol may cause drowsiness and/or dizziness, and has been associated with motor vehicle accidents. Patients should be advised to avoid taking carisoprodol before engaging in potentially hazardous activities such as driving a motor vehicle or operating machinery [see Warnings and Precautions (5.1)].
Avoidance of Alcohol and Other CNS Depressants
Advise patients to avoid alcoholic beverages while taking carisoprodol 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)].
Carisoprodol Should Only Be Used for Short-Term Treatment
Advise patients that treatment with carisoprodol 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, 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.
Advise nursing mothers using carisoprodol to monitor neonates for signs of sedation [see Use in Specific Populations (8.2)].
|Labeler - Carlsbad Technology, Inc. (781047246)|
|Orient Pharma||658849810||manufacture(61442-451) , analysis(61442-451)|