The Controlled Substances Act, passed by Congress in 1970, included the classification of various substances and drugs into a series of five schedules. These are Schedule I, II, II, IV, and V. The schedules are arranged in descending order from substances with the highest potential for abuse to least and the lists are updated and published on an annual basis. Schedule IV Controlled Substances have less abuse potential than those in schedules I, II or III.
The classification for Schedule IV substances and drugs stipulates that the drug or other substance has a low potential for abuse relative to the drugs or other substances in schedules III, that the drug or substance has a currently accepted medical use in treatment in the United States and that abuse of the drug or other substances may lead to limited physical dependence or psychological dependence relative to the drugs or other substances in schedule III.
Examples of substances and drugs currently classified as Schedule IV Controlled Substances include alprazolam (Xanax), barbital (Veronal, Plexonal, barbitone), clonazepam (Klonopin, Clonopin), Diazepam (Valium, Diastat), flunitrazepam (Rohypnol, Narcozep, Darkene, Roipnol), lorazepam (Ativan), nitrazepam (Mogadon), temazepam (Restoril) and zopiclone (Lunesta).
For the most complete current listing, check the U.S. Department of Justice, Drug Enforcement Agency website. The substance or drug name appears first, with other names, if any, in parentheses.