Carisoprodol: Difference between revisions

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|indicationType=treatment
|indicationType=treatment
|indication=discomfort associated with acute, painful musculoskeletal conditions in adults
|indication=discomfort associated with acute, painful musculoskeletal conditions in adults
|adverseReactions=dizziness, somnolence, headache
|adverseReactions=[[dizziness]], [[somnolence]], [[headache]]
|blackBoxWarningTitle=Title
|blackBoxWarningTitle=Title
|blackBoxWarningBody=<i><span style="color:#FF0000;">ConditionName: </span></i>
|blackBoxWarningBody=<i><span style="color:#FF0000;">ConditionName: </span></i>
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|offLabelPedGuideSupport=There is limited information regarding <i>Off-Label Guideline-Supported Use</i> of Carisoprodol in pediatric patients.
|offLabelPedGuideSupport=There is limited information regarding <i>Off-Label Guideline-Supported Use</i> of Carisoprodol in pediatric patients.
|offLabelPedNoGuideSupport=There is limited information regarding <i>Off-Label Non–Guideline-Supported Use</i> of Carisoprodol in pediatric patients.
|offLabelPedNoGuideSupport=There is limited information regarding <i>Off-Label Non–Guideline-Supported Use</i> of Carisoprodol in pediatric patients.
|contraindications=*Carisoprodol Tablets are contraindicated in patients with a history of acute intermittent porphyria or a hypersensitivity reaction to a carbamate such as meprobamate.
|contraindications=*Carisoprodol Tablets are contraindicated in patients with a history of [[acute intermittent porphyria]] or a [[hypersensitivity]] reaction to a carbamate such as meprobamate.
|warnings='''Sedation'''
|warnings='''Sedation'''


*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) 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.
*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) 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.
*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.


'''Abuse, Dependence, and Withdrawal'''
'''Abuse, Dependence, and Withdrawal'''


*Carisoprodol 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 poses a risk of overdosage which may lead to death, CNS and respiratory depression, hypotension, seizures, and other disorders.
*Carisoprodol has been subject to abuse, dependence, withdrawal, misuse, and criminal diversion. Abuse of carisoprodol poses a risk of overdosage which may lead to death, CNS and [[respiratory depression]], [[hypotension]], [[seizures]], and other disorders.


*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.
*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.


*To reduce the risk of carisoprodol 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.
*To reduce the risk of carisoprodol 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.
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*Cardiovascular: Tachycardia, postural hypotension, and facial flushing.
*Cardiovascular: Tachycardia, postural hypotension, and facial flushing.


*Central Nervous System: Drowsiness, dizziness, vertigo, ataxia, tremor, agitation, irritability, headache, depressive reactions, syncope, insomnia, and seizures.
*Central Nervous System: [[Drowsiness]], [[dizziness]], [[vertigo]], [[ataxia]], [[tremor]], [[agitation]], irritability, [[headache]], depressive reactions, [[syncope]], [[insomnia]], and [[seizures]].


*Gastrointestinal: Nausea, vomiting, and epigastric discomfort.
*Gastrointestinal: [[Nausea]], [[vomiting]], and epigastric discomfort.


*Hematologic: Leukopenia, pancytopenia.
*Hematologic: [[Leukopenia]], [[pancytopenia]].
|drugInteractions='''CNS Depressants'''
|drugInteractions='''CNS Depressants'''


*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.
*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.


'''CYP2C19 Inhibitors and Inducers'''
'''CYP2C19 Inhibitors and Inducers'''


*Carisoprodol is metabolized in the liver by CYP2C19 to form meprobamate. 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.
*Carisoprodol is metabolized in the liver by CYP2C19 to form meprobamate. 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.
|FDAPregCat=C
|FDAPregCat=C
|useInPregnancyFDA=*Pregnancy Category C. There are no data on the use of carisoprodol 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.
|useInPregnancyFDA=*Pregnancy Category C. There are no data on the use of carisoprodol 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.
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*350 mg Tablets: white, round, unscored tablets debossed "2410 V" on one side and plain on the reverse side.
*350 mg Tablets: white, round, unscored tablets debossed "2410 V" on one side and plain on the reverse side.
|IVCompat=There is limited information regarding <i>IV Compatibility</i> of {{PAGENAME}} in the drug label.
|IVCompat=There is limited information regarding <i>IV Compatibility</i> of {{PAGENAME}} in the drug label.
|overdose=*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.


|overdose=*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.
*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.
 
*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.
*For more information on the management of an overdose of carisoprodol, contact a Poison Control Center.
|drugBox=<!--Mechanism of Action-->
|drugBox=[[File:Carisoprodol image.png|600px|thumbnail|left]]
|mechAction=*  
{{clear}}
|mechAction=*The mechanism of action of carisoprodol in relieving discomfort associated with acute painful musculoskeletal conditions has not been clearly identified.


<!--Structure-->
*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.
|structure=: [[File:{{PAGENAME}}01.png|thumb|none|600px|This image is provided by the National Library of Medicine.]]
|structure=: [[File:{{PAGENAME}}01.png|thumb|none|600px|This image is provided by the National Library of Medicine.]]


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*Other ingredients in Carisoprodol Tablets, USP include croscarmellose sodium, hydrogenated vegetable oil, hypromellose, magnesium stearate and microcrystalline cellulose.
*Other ingredients in Carisoprodol Tablets, USP include croscarmellose sodium, hydrogenated vegetable oil, hypromellose, magnesium stearate and microcrystalline cellulose.
|PD=*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.
|PK=*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 Cmax of meprobamate was 2.5 ± 0.5 μg/mL (mean ± SD) after administration of a single 350 mg dose of carisoprodol, which is approximately 30% of the Cmax of meprobamate (approximately 8 μg/mL) after administration of a single 400 mg dose of meprobamate.
[[File:Carisoprodol table 2.png|600px|thumbnail|left]]
{{clear}}


|PD=There is limited information regarding <i>Pharmacodynamics</i> of {{PAGENAME}} in the drug label.
*Absorption: 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 may be administered with or without food.


<!--Pharmacokinetics-->
*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).
|PK=There is limited information regarding <i>Pharmacokinetics</i> of {{PAGENAME}} in the drug label.


<!--Nonclinical Toxicology-->
*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.
|nonClinToxic=There is limited information regarding <i>Nonclinical Toxicology</i> of {{PAGENAME}} in the drug label.


<!--Clinical Studies-->
*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.
|clinicalStudies=There is limited information regarding <i>Clinical Studies</i> of {{PAGENAME}} in the drug label.


<!--How Supplied-->
*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%.
|howSupplied=*
|nonClinToxic='''Carcinogenesis, Mutagenesis, Impairment of Fertility'''


<!--Patient Counseling Information-->
*Long term studies in animals have not been performed to evaluate the carcinogenic potential of carisoprodol.
|fdaPatientInfo=There is limited information regarding <i>Patient Counseling Information</i> of {{PAGENAME}} in the drug label.
 
|alcohol=* Alcohol-{{PAGENAME}} interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.
*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.
 
*Carisoprodol was not formally evaluated for effects on fertility. Published reproductive studies of carisoprodol in mice found no alteration in fertility although an alteration in reproductive cycles characterized by a greater time spent in estrus was observed at a carisoprodol dose of 1200 mg/kg/day. In a 13-week toxicology study that did not determine fertility, mouse testes weight and sperm motility were reduced at a dose of 1200 mg/kg/day. In both studies, the no effect level was 750 mg/kg/day, corresponding to approximately 2.6 times the human equivalent dosage of 350 mg four times a day, based on a body surface area comparison. The significance of these findings for human fertility is not known.
|clinicalStudies=*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.
 
[[File:Carisoprodol table 3.png|600px|thumbnail|left]]
{{clear}}
 
*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. The ANOVA model was used for the primary statistical comparison between the carisoprodol 250 mg and placebo groups.
 
*Patients treated with carisoprodol experienced improvement in function as measured by the Roland-Morris Disability Questionnaire (RMDQ) score on Days 3 and 7.
|howSupplied=Carisoprodol Tablets USP, 350 mg: white, round, unscored tablets debossed "2410 V" on one side and plain on the reverse side; available as follows:
 
Bottle of 15 - 68788-2582-1
 
Bottle of 20 - 68788-2582-2
 
Bottle of 30 - 68788-2582-3
 
Bottle of 60 - 68788-2582-6
 
Bottle of 90 - 68788-2582-9
 
Bottle of 100 - 68788-2582-0
 
Bottle of 120 - 68788-2582-8
|storage=*Store at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature].
|drugImages=[[File:Carisoprodol pdp.png|600px|thumbnail|left]]
{{clear}}
 
[[File:Carisoprodol label.png|600px|thumbnail|left]]
{{clear}}
|fdaPatientInfo=*Patients should be advised to contact their physician if they experience any adverse reactions to carisoprodol tablets.
 
'''Sedation'''
 
*Patients should be advised that carisoprodol tablets 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.
 
'''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.
 
'''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.
 
*To report SUSPECTED ADVERSE REACTIONS, contact Qualitest Pharmaceuticals at 1-800-444-4011 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
|alcohol=*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.
|brandNames=Soma,
|brandNames=Soma,
Vanadom.
Vanadom.
|drugShortage=
|drugShortage=
}}
}}
{{PillImage
 
|fileName=No image.jpg
}}
{{LabelImage
{{LabelImage
|fileName={{PAGENAME}}11.png
|fileName={{PAGENAME}}11.png
Line 154: Line 212:
}}
}}
<!--Pill Image-->
<!--Pill Image-->
 
{{PillImage|fileName=Carisoprodol_NDC_06032582.jpg|drugName=Carisoprodol|NDC=06032582|drugAuthor=Qualitest Pharmaceuticals|ingredients=CARISOPRODOL[CARISOPRODOL]|pillImprint=2410;V|dosageValue=350|dosageUnit=mg|pillColor=White|pillShape=Round|pillSize=12|pillScore=1}}
{{PillImage|fileName=Carisoprodol_NDC_422910200.jpg|drugName=Carisoprodol|NDC=422910200|drugAuthor=AvKARE, Inc.|ingredients=Carisoprodol[Carisoprodol]|pillImprint=CL;022|dosageValue=350|dosageUnit=mg|pillColor=White|pillShape=Round|pillSize=12|pillScore=1}}
{{PillImage|fileName=Carisoprodol_NDC_675440012.jpg|drugName=Carisoprodol|NDC=675440012|drugAuthor=Aphena Pharma Solutions - Tennessee, LLC|ingredients=CARISOPRODOL[CARISOPRODOL]|pillImprint=2410;V|dosageValue=350|dosageUnit=mg|pillColor=White|pillShape=Round|pillSize=12|pillScore=1}}
{{PillImage|fileName=Soma_NDC_00372250.jpg|drugName=Soma|NDC=00372250|drugAuthor=Meda Pharmaceuticals Inc.|ingredients=CARISOPRODOL[CARISOPRODOL]|pillImprint=SOMA;250|dosageValue=250|dosageUnit=mg|pillColor=White|pillShape=Round|pillSize=10|pillScore=1}}
{{PillImage|fileName=Carisoprodol_NDC_05915513.jpg|drugName=Carisoprodol|NDC=05915513|drugAuthor=Watson Laboratories, Inc.|ingredients=CARISOPRODOL[CARISOPRODOL]|pillImprint=DAN;5513|dosageValue=350|dosageUnit=mg|pillColor=White|pillShape=Round|pillSize=12|pillScore=1}}
{{PillImage|fileName=Carisoprodol_NDC_515255901.jpg|drugName=Carisoprodol|NDC=515255901|drugAuthor=Wallace Pharmaceuticals Inc.|ingredients=CARISOPRODOL[CARISOPRODOL]|pillImprint=WP;5901|dosageValue=250|dosageUnit=mg|pillColor=White|pillShape=Round|pillSize=10|pillScore=1}}





Latest revision as of 02:09, 17 September 2015

Carisoprodol
Adult Indications & Dosage
Pediatric Indications & Dosage
Contraindications
Warnings & Precautions
Adverse Reactions
Drug Interactions
Use in Specific Populations
Administration & Monitoring
Overdosage
Pharmacology
Clinical Studies
How Supplied
Images
Patient Counseling Information
Precautions with Alcohol
Brand Names
Look-Alike Names

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Deepika Beereddy, MBBS [2]

Disclaimer

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Overview

Carisoprodol is a central nervous system agent that is FDA approved for the treatment of discomfort associated with acute, painful musculoskeletal conditions in adults. Common adverse reactions include dizziness, somnolence, headache.

Adult Indications and Dosage

FDA-Labeled Indications and Dosage (Adult)

Disorder of musculoskeletal system
  • Dosing Information
  • The usual effective doses of carisoprodol for acute musculoskeletal conditions is 250 to 350 milligrams three times daily and at bedtime

Off-Label Use and Dosage (Adult)

Guideline-Supported Use

There is limited information regarding Off-Label Guideline-Supported Use of Carisoprodol in adult patients.

Non–Guideline-Supported Use

There is limited information regarding Off-Label Non–Guideline-Supported Use of Carisoprodol in adult patients.

Pediatric Indications and Dosage

FDA-Labeled Indications and Dosage (Pediatric)

Disorder of musculoskeletal system
  • Dosing Information
  • In children 16 years and older, the recommended dose is carisoprodol 250 to 350 milligrams 3 times daily and at bedtime.
  • Safety and efficacy of carisoprodol in children aged under 16 years have not been established

Off-Label Use and Dosage (Pediatric)

Guideline-Supported Use

There is limited information regarding Off-Label Guideline-Supported Use of Carisoprodol in pediatric patients.

Non–Guideline-Supported Use

There is limited information regarding Off-Label Non–Guideline-Supported Use of Carisoprodol in pediatric patients.

Contraindications

Warnings

Sedation

  • 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) 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.

Abuse, Dependence, and Withdrawal

  • Carisoprodol has been subject to abuse, dependence, withdrawal, misuse, and criminal diversion. Abuse of carisoprodol poses a risk of overdosage which may lead to death, CNS and respiratory depression, hypotension, seizures, and other disorders.
  • 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.
  • To reduce the risk of carisoprodol 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.

Seizures

  • There have been postmarketing 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).

Adverse Reactions

Clinical Trials 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. 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.

Postmarketing Experience

  • 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.

Drug Interactions

CNS Depressants

  • 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.

CYP2C19 Inhibitors and Inducers

  • Carisoprodol is metabolized in the liver by CYP2C19 to form meprobamate. 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.

Use in Specific Populations

Pregnancy

Pregnancy Category (FDA): C

  • Pregnancy Category C. There are no data on the use of carisoprodol 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 to 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 should be used during pregnancy only if the potential benefit justifies the risk to the fetus.


Pregnancy Category (AUS):

  • Australian Drug Evaluation Committee (ADEC) Pregnancy Category

There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Carisoprodol in women who are pregnant.

Labor and Delivery

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

Nursing Mothers

  • Very limited data in humans show that carisoprodol is 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 to 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 may lead to reduced or less effective infant feeding (due to sedation) and/or decreased milk production. Caution should be exercised when carisoprodol is administered to a nursing woman.

Pediatric Use

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

Geriatic Use

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

Gender

  • There is no FDA guidance on the use of Carisoprodol with respect to specific gender populations.

Race

  • There is no FDA guidance on the use of Carisoprodol with respect to specific racial populations.

Renal Impairment

  • 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.

Hepatic Impairment

  • 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.

Females of Reproductive Potential and Males

  • There is no FDA guidance on the use of Carisoprodol in women of reproductive potentials and males.

Immunocompromised Patients

There is no FDA guidance one the use of Carisoprodol in patients who are immunocompromised.

Patients with Reduced CYP2C19 Activity

  • Patients with reduced CYP2C19 activity have higher exposure to carisoprodol. Therefore, caution should be exercised in administration of carisoprodol to these patients.

Administration and Monitoring

Administration

  • The recommended dose of carisoprodol is 250 mg to 350 mg three times a day and at bedtime. The recommended maximum duration of carisoprodol use is up to two or three weeks.

Dosage forms and strengths

  • 350 mg Tablets: white, round, unscored tablets debossed "2410 V" on one side and plain on the reverse side.

Monitoring

There is limited information regarding Carisoprodol Monitoring in the drug label.

IV Compatibility

There is limited information regarding IV Compatibility of Carisoprodol in the drug label.

Overdosage

  • 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.

Pharmacology

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.

Structure

File:Carisoprodol01.png
This image is provided by the National Library of Medicine.
  • Carisoprodol Tablets USP are available as 350 mg round, white tablets for oral administration. 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 in Carisoprodol Tablets, USP include croscarmellose sodium, hydrogenated vegetable oil, hypromellose, magnesium stearate and microcrystalline cellulose.

Pharmacodynamics

  • 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.

Pharmacokinetics

  • 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 Cmax of meprobamate was 2.5 ± 0.5 μg/mL (mean ± SD) after administration of a single 350 mg dose of carisoprodol, which is approximately 30% of the Cmax of meprobamate (approximately 8 μg/mL) after administration of a single 400 mg dose of meprobamate.
  • Absorption: 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 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 to 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%.

Nonclinical Toxicology

Carcinogenesis, Mutagenesis, Impairment of Fertility

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

Clinical Studies

  • 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 results for the primary efficacy evaluations in the acute, low back pain studies are presented in Table 3.
  • 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. The ANOVA model was used for the primary statistical comparison between the carisoprodol 250 mg and placebo groups.
  • Patients treated with carisoprodol experienced improvement in function as measured by the Roland-Morris Disability Questionnaire (RMDQ) score on Days 3 and 7.

How Supplied

Carisoprodol Tablets USP, 350 mg: white, round, unscored tablets debossed "2410 V" on one side and plain on the reverse side; available as follows:

Bottle of 15 - 68788-2582-1

Bottle of 20 - 68788-2582-2

Bottle of 30 - 68788-2582-3

Bottle of 60 - 68788-2582-6

Bottle of 90 - 68788-2582-9

Bottle of 100 - 68788-2582-0

Bottle of 120 - 68788-2582-8

Storage

  • Store at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature].

Images

Drug Images

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Package and Label Display Panel

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Patient Counseling Information

  • Patients should be advised to contact their physician if they experience any adverse reactions to carisoprodol tablets.

Sedation

  • Patients should be advised that carisoprodol tablets 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.

Avoidance of Alcohol and Other CNS Depressants

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.
  • To report SUSPECTED ADVERSE REACTIONS, contact Qualitest Pharmaceuticals at 1-800-444-4011 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

Precautions with Alcohol

Brand Names

Soma, Vanadom.

Look-Alike Drug Names

There is limited information regarding Carisoprodol Look-Alike Drug Names in the drug label.

Drug Shortage Status

Price

References

The contents of this FDA label are provided by the National Library of Medicine.


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