carisoprodol /ker′isōprō″dol/ , a skeletal muscle relaxant. ▪ INDICATIONS: It is prescribed for the relief of muscle spasm. ▪ CONTRAINDICATIONS: Porphyria or known hypersensitivity to this drug or to chemically similar drugs, such as meprobamate, prohibits its use. ▪ ADVERSE EFFECTS: Among the more serious adverse reactions are ataxia, drowsiness, pronounced weakness, visual disturbances, mental confusion, anaphylactic shock, erythema multiforme, and allergic reactions.