2,5-DMA

2,5-DMA (2,5-dimethoxyamphetamine) is a ring-substituted amphetamine and the 4-unsubstituted parent structure of the DOx family of psychedelics. Classic structure-activity work established that it engages 5-HT2 serotonin receptors directly and produces DOM-appropriate responding in drug-discrimination assays, but with substantially lower potency than 4-substituted congeners such as DOM, DOB, and DOI, indicating that the 4-position substituent is the principal determinant of hallucinogenic potency. Pharmacological studies distinguish its action from serotonin-releasing amphetamines such as para-methoxyamphetamine, showing that 2,5-DMA acts as a direct receptor agonist rather than by evoking transmitter release. Its psychoactivity in humans is therefore weak and carries a comparatively stimulant-tinged character. Like related 2,5-dimethoxyamphetamines, it is metabolized largely by CYP2D6-mediated O-demethylation and can competitively inhibit that enzyme in vitro.