Valium is a brand name the drug diazepam is sold under. Like Xanax, it belongs to benzodiazepine drug family. It is commonly prescribed for the treatment of anxiety, panic disorder and muscle spasms. In some cases, it is also used during the treatment of alcoholism. Like other benzodiazepines, it is a central nervous system depressant which means it produces its effects by slowing down mental activities. It is a widely used and abused drug and millions of prescriptions are written for it in United States alone. Its prolonged use has been known to cause addiction that needs proper treatment for recovery.