3,4-Methylenedioxymethamphetamine, commonly known as ecstasy or molly, is a psychoactive drug primarily used for recreational purposes. Provides basic facts about MDMA, also called Ecstasy or Molly, including how it affects the brain, other health effects, and its potential for. Many articles online say the drug is "pure" MDMA, the active ingredient in Ecstasy. In fact, MDMA was a legal substance until 1985, when the Drug Enforcement Administration (DEA). The Molly drug has become incredibly popular among young people. Molly, a variety of the drug MDMA, also sometimes called Ecstasy, might help you party all night, but it also just might kill you.