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SOMA® COMPOUND with CODEINE
(carisoprodol, aspirin and codeine phosphate, USP)
200 mg + aspirin 325 mg + codeine phosphate 16 mg.
Warning: May be habit-forming.
Tablets
CIII
Rx Only
DESCRIPTION - ‘Soma’ Compound with Codeine is a combination product containing carisoprodol, a centrally-acting muscle relaxant, plus aspirin, an analgesic with antipyretic and antiinflammatory properties and codeine phosphate, a centrally-acting narcotic analgesic. It is available as a two-layered, white and yellow, oval-shaped tablet for oral administration. Each tablet contains carisoprodol, USP 200 mg, aspirin 325 mg, and codeine phosphate, USP 16 mg. Chemically, carisoprodol is N-isopropyl-2- methyl-2-propyl-1,3-propanediol dicarbamate. Its empirical formula is C12H24N2O4, with a molecular weight of 260.34. The structural formula is:
Other ingredients: croscarmellose sodium, D&C Yellow #10, hydroxypropyl methylcellulose, magnesium stearate, microcrystalline cellulose, povidine, sodium metabisulfite, starch, stearic acid.
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CLINICAL PHARMACOLOGY- Carisoprodol: Carisoprodol is a centrally acting muscle relaxant that does not directly relax tense skeletal muscles in man. The mode of action of Carisoprodol in relieving acute muscle spasm of local origin has not been clearly identified, but may be related to its sedative properties. In animals, carisoprodol has been shown to produce muscle relaxation by blocking interneuronal activity and depressing transmission of polysynaptic neurons in the spinal cord and in the descending reticular formation of the brain. The onset of action is rapid and lasts four to six hours.
Carisoprodol is metabolized in the liver and is excreted by the kidneys. It is dialyzable by peritoneal and hemodialysis.
Aspirin: Aspirin is a nonnarcotic analgesic with antiinflammatory and antipyretic activity. Inhibition of prostaglandin biosynthesis appears to account for most of its antiinflammatory and for at least part of its analgesic and antipyretic properties.
Aspirin is rapidly absorbed and almost totally hydrolyzed to salicylic acid following oral administration. Although aspirin has a half-life of only about 15 minutes, the apparent biologic half-life of salicylic acid in the therapeutic plasma concentration range is between 6 and 12 hours. Salicylic acid is eliminated by renal excretion and by biotransformation to inactive metabolite. Clearance of salicylic acid in the high-dose range is sensitive to urinary pH ( see Drug Interactions) and is reduced by renal dysfunction.
Codeine Phosphate: Codeine phosphate is a centrally acting narcotic-analgesic. Its actions are qualitatively similar to morphine, but its potency is substantially less.
Clinical studies have shown that combining aspirin and codeine produces a significant additive effect in analgesic efficacy.
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