Diazepam (Valium) is a prescription drug doctors prescribe for treating symptoms of anxiety disorders. Consumer information about the medication DIAZEPAM - RECTAL (Diastat), includes side effects, drug interactions, recommended dosages, and storage information. Read ... Consumer Medicine Information (CMI) about Valium (diazepam) intended for persons living in Australia. The physiological effects of Valium (diazepam) don’t last long, only about 4-6 hours. However, Valium’s long half life makes Valium drug test detectable in your ... Valium (diazepam) withdrawal can last for weeks. Why? Valium is a benzodiazepine. It used to provide short term relief for anxiety and has been used to help to ... Diazepam is a controlled substance drug used to treat anxiety, alcohol withdrawal, muscle spasms, and certain types of seizures. Read more. Diazepam. Diazepam is a type of medicine called a benzodiazepine. Benzodiazepines are used for their sedative, anxiety-relieving and muscle-relaxing effects.