Diazepam, commonly marketed under the brand name Valium, is a medication belonging to the benzodiazepine class. It is primarily used to treat anxiety disorders, muscle spasms, seizures, and symptoms of alcohol withdrawal. Diazepam works by enhancing the effects of gamma-aminobutyric acid (GABA), a neurotransmitter that inhibits the activity of neurons, resulting in a calming effect on the brain and central nervous system.