The U.S. Drug Enforcement Administration classifies methamphetamine as a Schedule II drug. Drugs classified under Schedule II have a high potential of abuse, and their use can lead to severe psychological or physical dependence.
According to the Controlled Substances Act, Schedule II drugs and substances have currently accepted medical applications in the United States. Other examples of Schedule II drugs include opiates and their derivatives, such as morphine, methadone and codeine.
Those Schedule II drugs that have medical applications may only be dispensed by written permission of a medical practitioner, except in emergency situations. Additionally, Schedule II drugs cannot be dispensed by refill orders.