Benzodiazepine.

Benzodiazepines are a class of psychoactive drugs that consist of two ring components, namely a six-carbon benzene ring and a seven-membered heterocyclic compound that includes two nitrogen atoms. One of the first benzodiazepines that was developed is chlordiazepoxide (trade name Librium), which was formulated in the 1950s and released on the market in 1960. By the year 1963, another formulation, benzodiazepine diazepam (trade name Valium), was released. By the late 1970s, benzodiazepines were recognized as the most prescribed drug around the world.