Diazepam (Valium) is used in man medical protocols to taper people off of other Benzos and to prevent seizures when people are detoxing from alcohol.  Valium has a half-life of between 20-100 hours, depending on a person’s  metabolism and DNA.  Valium is used at in medical detoxes because it is tolerated well by most people and seems to have the least effect on the re-adjustment of the body to withdrawal from Benzos or alcohol.