Chlordiazepoxide was one of the first benzodiazepines discovered and is used as an anxiolytic. Benzodiazepines are a class of psychoactive drugs with varying hypnotic, sedative, anxiolytic, anticonvulsant, muscle relaxant, and amnesic properties. Buspirone is an azapirone anxiolytic, meprobamate is a carbamate derivative anxiolytic and muscle relaxant, and chloral hydrate is a sedative-hypnotic.