PurifiedPurified. MDMA (3,4-Methylenedioxymethamphetamine, Ecstasy) is a psychoactive amphetamine drug with entactogenic, psychedelic, and stimulant effects. The mechanism of action of MDMA's unusual effects has yet to be fully understood, although it is generally thought that the primary relevant pharmacological characteristic of the drug is its affinity for the plasmalemmal membrane transport protein the serotonin transporter (SERT). The SERT is a part of serotonergic neurons and removes t