Valium is known as diazepam. It is used to treat anxiety and alcohol withdrawal. It belongs to a group of medication classes of drugs. It works by helping your nervous system calm down. is a benzodiazepine. It is also used to treat sleep problems. It is given to people to calm their nerves when they are very depressed. Some common side effects of Valium include sleepiness, dizziness, and muscle weakness. Valium available is 5mg and 10mg