Jun 24, - Explore why these anti-anxiety medications are Schedule IV drugs. Benzodiazepines such as Ativan, Xanax, and Valium are a class of. One substance may be Schedule I, while another is Schedule II, III, or IV. V substances involve preparing the drug with a small quantity of some narcotic. This is the list of Schedule IV drugs as defined by the United States Controlled Substances Act. List of Schedule IV drugs (US) , Diazepam.