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Carisoprodol
Pronunciation
U.S. Brand Names
Generic Available
Synonyms
Pharmacological Index
Use
Pregnancy Risk Factor
Contraindications
Warnings/Precautions
Adverse Reactions
Overdosage/Toxicology
Drug Interactions
Mechanism of Action
Pharmacodynamics/Kinetics
Usual Dosage
Dietary Considerations
Monitoring Parameters
Mental Health: Effects on Mental Status
Mental Health: Effects on Psychiatric Treatment
Dental Health: Local Anesthetic/Vasoconstrictor Precautions
Dental Health: Effects on Dental Treatment
Patient Information
Nursing Implications
Dosage Forms
Extemporaneous Preparations
References

Pronunciation
(kar i soe PROE dole)

U.S. Brand Names
Soma®

Generic Available

Yes


Synonyms
Carisoprodate; Isobamate

Pharmacological Index

Skeletal Muscle Relaxant


Use

Dental: Treatment of muscle spasm associated with acute temporomandibular joint pain

Medical: Skeletal muscle relaxant


Pregnancy Risk Factor

C


Contraindications

Acute intermittent porphyria, hypersensitivity to carisoprodol, meprobamate or any component


Warnings/Precautions

Use with caution in renal and hepatic dysfunction


Adverse Reactions

>10%: Central nervous system: Drowsiness

1% to 10%:

Cardiovascular: Tachycardia, tightness in chest, flushing of face, syncope

Central nervous system: Mental depression, allergic fever, dizziness, lightheadedness, headache, paradoxical CNS stimulation

Dermatologic: Angioedema

Gastrointestinal: Nausea, vomiting, stomach cramps

Neuromuscular & skeletal: Trembling

Ocular: Burning eyes

Respiratory: Shortness of breath

Miscellaneous: Hiccups

<1%: Ataxia, rash, urticaria, erythema multiforme, aplastic anemia, leukopenia, eosinophilia, blurred vision


Overdosage/Toxicology

Symptoms of overdose include CNS depression, stupor, coma, shock, respiratory depression

Treatment is supportive following attempts to enhance drug elimination. Hypotension should be treated with I.V. fluids and/or Trendelenburg positioning.


Drug Interactions

CYP2C19 enzyme substrate


Mechanism of Action

Precise mechanism is not yet clear, but many effects have been ascribed to its central depressant actions


Pharmacodynamics/Kinetics

Onset of action: Within 30 minutes

Duration: 4-6 hours

Distribution: Crosses the placenta; appears in high concentrations in breast milk

Metabolism: By the liver

Half-life: 8 hours

Elimination: By the kidneys


Usual Dosage

Adults: Oral: 350 mg 3-4 times/day; take last dose at bedtime; compound: 1-2 tablets 4 times/day


Dietary Considerations

Alcohol: Additive CNS effects, avoid use


Monitoring Parameters

Look for relief of pain and/or muscle spasm and avoid excessive drowsiness


Mental Health: Effects on Mental Status

Drowsiness is common; may produce depression or paradoxical CNS stimulation


Mental Health: Effects on Psychiatric Treatment

Rarely may cause leukopenia or aplastic anemia; use caution with clozapine and carbamazepine; concurrent use with psychotropics may produce additive sedation


Dental Health: Local Anesthetic/Vasoconstrictor Precautions

No information available to require special precautions


Dental Health: Effects on Dental Treatment

No effects or complications reported


Patient Information

Take exactly as directed with food. Do not increase dose or discontinue without consulting prescriber. Do not use alcohol, prescriptive or OTC antidepressants, sedatives, and pain medications without consulting prescriber. You may experience drowsiness, dizziness, lightheadedness (avoid driving or engaging in tasks requiring alertness until response to drug is known); nausea, vomiting, or cramping (small, frequent meals, frequent mouth care, or sucking hard candy may help); or postural hypotension (change position slowly when rising from sitting or lying or when climbing stairs). Report excessive drowsiness or mental agitation; palpitations, rapid heartbeat, or chest pain; skin rash; muscle cramping or tremors; or respiratory difficulty. Pregnancy/breast-feeding precautions: Inform prescriber if you are or intend to be pregnant. Breast-feeding is not recommended.


Nursing Implications

Raise bed rails; institute safety measures; assist with ambulation


Dosage Forms

Tablet: 350 mg


Extemporaneous Preparations

A suspension can be prepared by triturating 60 carisoprodol 350 mg tablets, a small amount of water or glycerin, then mixing with a sufficient quantity of cherry syrup to bring the final volume to 60 mL; when refrigerated, the suspension is stable for 14 days; shake well before administration


References

Adams HR, Kerzee T, and Morehead CD, "Carisoprodol-Related Death in a Child," J Forensic Sci, 1975, 20:200-2.

Backer RC, Zumwalt R, McFeeley P, et al, "Carisoprodol Concentrations From Different Anatomical Sites: Three Overdose Cases," J Anal Toxicol, 1990, 14(5):332-4.

Goldberg D, "Carisoprodol Toxicity," Milit Med, 1969, 34:597-601.

Luehr JG, Meyerle KA, and Larson EW, "Mail-Order (Veterinary) Drug Dependence," JAMA, 1990, 263(5):657.


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