Benzodiazepines are psychoactive drugs whose core chemical structure is the fusion of a benzene ring and a diazepine ring. The pharmacological target of benzodiazepines is GABA, the major inhibitory neurotransmitter in the central nervous system. The best known drug of this series is diazepam, which is used as an anxiolytic, sedative-hypnotic, and anticonvulsant. Midazolam is used for preoperative sedation/anxiolysis with anterograde amnesia. Adverse effects include drowsiness and potential for addiction.