3,4-Methylene dioxy amphetamine (MDA), is an empathogen-entactogen, psychostimulant, and psychedelic drug of the amphetamine family that is encountered mainly as a recreational drug. In terms of pharmacology, MDA acts most importantly as a serotonin-norepinephrine-dopamine releasing agent (SNDRA).
While MDA is similar to MDMA, users report that MDA has more stimulant and psychedelic qualities and less intense entactogenic effects than MDMA. MDA is also considered to be less predictable than MDMA, with effects varying greatly from person to person.
MDMA, also known as molly or ecstasy, is widely abused in the US for its euphoric, anxiety-relieving effects. It has a number of negative side effects.