Methylenedioxyamphetamine, also known as 3,4-methylenedioxy-amphetamine, MDA, tenamfetamine (INN), or colloquially as "Sally", "Sass", or "Sass-a-frass", is a psychoactive drug of the substituted methylenedioxyphenethylamine and substituted amphetamine classes of drugs that is consumed primarily for its entactogenic, psychedelic, and psychostimulant effects. Pharmacologically, MDA acts as a serotonin-norepinephrine-dopamine releasing agent and reuptake inhibitor. Possession of MDA is illegal in most countries. Some limited exceptions exist for scientific and medical research. The recreational use of MDA predates its more widely used analog MDMA (ecstasy).