MPM (psychedelic)  MPM (2,5-dimethoxy-4-propoxyamphetamine) is a lesser-known psychedelic drug and a substituted amphetamine. MPM was first synthesized by Alexander Shulgin. In his book "PiHKAL", dosage is given as "30 mg or more" and duration "probably short". MPM is of low potency and produced only slight effects at the highest dose reported in PiHKAL of 30 mg, although its effects at higher doses than this have not been reported. Very little data exists about the pharmacological properties, metabolism, and toxicity of MPM.