Valium is a medication that can be used to treat anxiety and valium has a sedative effect that is useful for treating muscle spasms. Valium tablets have a sleeping disorder like insomnia. The doctor prescribes valium to help regulate your sleep cycle. Valium antidepressant benzodiazepines are a group of depressant drugs. Doctors recommend the drug should be used at a dose of 2 to 10 mg. They are sometimes prescribed as muscle relaxants.