Carisoprodol

Carisoprodol is a centrally acting skeletal muscle relaxant of the carbamate class and produces all the effects associated with barbiturate receptor ligands. It is slightly soluble in water and freely soluble in ethanol, chloroform and acetone. The drug's solubility is practically independent of pH. Carisoprodol is manufactured and marketed in the United States by Meda Pharmaceuticals. The drug is available by itself or mixed with aspirin, and in one preparation with codeine and caffeine, as well. Although carisoprodol has significant pharmacological activity, its benefit in therapy is likely due mostly to the meprobamate metabolite as meprobamate remains in the system significantly longer and reaches a higher peak plasma concentration than the parent drug a few hours following administration. This is further evidenced by carisoprodol's ability to maintain relevant benefits when administered 3-4 times a day despite its short half-life of only two hours.