Valium may also be used to treat epilepsy, although it is usually not used long term. diazepam without prescription Symptoms of anxiety, panic attacks, and agitation are often treated with Valium as it begins working quickly and can provide relief for patients without having it build up in the blood stream. Symptoms of anxiety, panic attacks, and agitation are often treated with Valium as it begins working quickly and can provide relief for patients without having it build up in the blood stream.