MDMA, Heroin, and Fentanyl are classified under which schedule of drugs?

MDMA, heroin, and fentanyl are classified as Schedule I drugs. Schedule I drugs are defined by the Controlled Substances Act as substances that have a high potential for abuse, have no currently accepted medical use in treatment in the United States, and lack accepted safety for use under medical supervision.

Heroin is an opioid that is illegal in the U.S. and is known for its high potential for addiction and abuse. MDMA, commonly known as ecstasy, is used recreationally but is also considered to have a significant potential for abuse and does not have accepted medical uses, although some research has explored its therapeutic potential. Fentanyl, while it does have accepted medical uses in pain management, is also classified as a Schedule I substance when considered in its illicit manufacturing and use context due to its high potency and the risks associated with abuse.

As a result, all these substances fit the criteria of Schedule I drugs due to their potential for abuse and lack of accepted medical use in many cases.