Styramate is a nonsedative skeletal muscle relaxant drug, developed by the Armour Pharmaceutical Company in 1952. The drug induces relaxation of skeletal musculus by interruption of nerve transmission in the spinal cord and brain stem rather than by exerting a blocking effect at the junction between the motor nerves and the muscles. In mouse studies styramate was found to exert a selective antagonism to hindleg extensor tonic spasm, induced by maximal electroshock, pentylenetetrazol, and strychnine sulfate. In the clinic, the drug was used in patients with neurologic and neuromuscular disorders, secondary muscular spasms. Styramate is marketed in South Africa under tradename Sinaxamol.