MMDA-3a, also known as 2-methoxy-3,4-methylenedioxyamphetamine or as 2-methoxy-MDA, is a psychedelic drug of the amphetamine family. It is the 2-methoxy derivative of 3,4-methylenedioxyamphetamine (MDA). The drug produces hallucinogenic effects in humans. Its dose is listed as 20 to 80mg orally and its duration as 10 to 16hours in Alexander Shulgin's book PiHKAL (Phenethylamines I Have Known and Loved). A higher dose of 100mg was also reportedly explored and doses of 80 to 100mg were said to be very similar to 100üg LSD. The chemical synthesis of MMDA-3a has been described. MMDA-3a is a positional isomer of MMDA and hence is a Schedule I controlled substance in the United States. It is also a controlled substance in Canada under phenethylamine blanket-ban language.