This is the list of Schedule IV drugs as defined by the United States Controlled Substances Act. List of Schedule IV drugs (US) , Clonazepam. A controlled (scheduled) drug is one whose use and distribution is tightly controlled Schedule III, IV, or V drugs include those containing smaller amounts of. A Listing of drugs and their schedule are located at Controlled Substance Act (CSA) Schedule IV drugs, substances, or chemicals are defined as drugs with a low Xanax, Soma, Darvon, Darvocet, Valium, Ativan, Talwin, Ambien, Tramadol.