Valium is a prescription medication that is often used to help people feel calmer and less anxious. It belongs to a group of drugs called benzodiazepines, which work by affecting certain chemicals in the brain. Doctors typically prescribe Valium for anxiety, muscle spasms, or seizures. It is important to take this medicine exactly as the doctor says to avoid side effects. Some common side effects can include drowsiness, dizziness, and tiredness. Always talk to a doctor if you have questions or concerns about using Valium.