May 26, - The most commonly encountered drugs currently controlled under the specifically Parts I, II, III and IV of Schedule 2 to the Misuse of Drugs. 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 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.