Table 1.

Scheduled Drugs: Definitions and Examples

Scheduled Drugs	Definition	Examples
Schedule II	Has an accepted medical use in treatment in United States but has a high abuse potential. Abuse may lead to severe psychological or physical dependence	Morphine, Cocaine, Oxycodone, Hydrocodone*, Barbiturates, Amphetamines
Schedule III	Has a potential for abuse less than the drugs in schedules I and II. Has a currently accepted medical use in treatment in the United States. Abuse may lead to moderate or low physical dependence or high psychological dependence	Codeine, Ketamine, Anabolic steroids, Suboxone
Schedule IV	Has a low potential for abuse relative to the drugs in schedule III. Has a currently accepted medical use in treatment in the United States. Abuse may lead to limited physical or psychological dependence relative to the drugs in Schedule III	Diazepam, Alprazolam, Phenobarbital, Lorazepam, Zolpidem, Phentermine
Schedule V	Has a low potential for abuse relative to the drugs in schedule IV. Has a currently accepted medical use in treatment in the United States. Abuse may lead to limited physical or psychological dependence relative to the drugs in Schedule IV	OTC Cough syrups containing codeine, Diphenoxylate/atropine

^*For the duration of this study, Hydrocodone was classified as Schedule III. However, it was reclassified from Schedule III to Schedule II in 2014