A controlled (scheduled) drug is one whose use and distribution is tightly controlled because of its abuse potential or risk. Controlled drugs are rated in the order of their abuse risk and placed in Schedules by the Federal Drug Enforcement Administration (DEA).
The drugs with the highest abuse potential are placed in Schedule I, and those with the lowest abuse potential are in Schedule V. These schedules are commonly shown as C-I, C-II, C-III, C-IV, and C-V.
Schedule I — These are drugs with a high abuse risk. These drugs have NO safe, accepted medical use in the U.S. For example – heroin, marijuana, LSD, PCP, and crack cocaine.
Schedule II – These are drugs with a high abuse risk but have been deemed to have medical uses in the U.S. There is an risk of psychological and physical addiction with these drugs. Examples include: morphine, cocaine, oxycodone (Percodan®), methylphenidate (Ritalin®), and dextroamphetamine (Dexedrine®)
Schedule III, IV, V - These drug also have safe and accepted medical uses in the United States. Schedule III, IV, or V drugs include those containing smaller amounts of certain narcotic and non-narcotic drugs, anti-anxiety drugs, tranquilizers, sedatives, stimulants, and non-narcotic analgesics.
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