Diazepam: Purpose Overview Diazepam shopped under the brand name Valium, used for the treatment of anxiety disorders, alcohol withdrawal symptoms, or muscle spasms. It belongs to the benzodiazepine family of drugs. Diazepam is a sedative-hypnotic medication, comes in both tablet as well as injectable forms. The primary use of Diazepam is the treatment of anxiety disorder. In addition to it, people also buy Valium for the treatment of insomnia, .