what does valium do
Best Answer: Valium (diazepam) is in a class of drugs called benzodiazepines. Valium (diazepam) affects chemicals in the brain that may become unbalanced and cause anxiety, seizures, and muscle spasms. for more information: http://www.drugs.com/valium.html.Source(s): inimesh4u Â· 8 years ago. Thumbs up.alium (diazepam) affects chemicals in the brain that may become unbalanced and cause anxiety, seizures, and muscle spasms. for more information: http://www.drugs.com/valium.html. Source(s): inimesh4u Â· 8 years ago. Thumbs up.