5-Methyl-3,4-methylenedioxyamphetamine (5-Methyl-MDA) is an entactogen and psychedelic drug of the amphetamine class. It is a ring-methylated derivative of MDA and a structural isomer of MDMA.Drug discrimination studies showed that 5-methyl-MDA substitutes for MDA, MMAI, and LSD, but not amphetamine, suggesting that it produces a mix of entactogen and hallucinogenic effects without any stimulant effects.

5-Methyl-MDA acts as a selective serotonin releasing agent (SSRA) with IC₅₀ values of 107nM, 11,600nM, and 1,494nM for serotonin, dopamine, and norepinephrine efflux. It is over 5x more potent than MDA, with a suitable active dose possibly being around 15-25 mg.2-Methyl-MDA is also much more potent than MDA, but is not quite as potent as 5-methyl-MDA. Both 6-methyl-MDA and 6-methyl-MDMA (also known as Madam-6) are inactive, likely due to steric hindrance.

Recent research has used data on 2-methyl-MDA and 5-methyl-MDA to help guide computer modeling of the serotonin transporter complex.

The synthesis of 5-methyl-MDA can be found online.