MDA

MDA (3,4-methylenedioxyamphetamine) is a psychoactive drug of the amphetamine and phenethylamine families, closely related to MDMA. It is both an entactogen (producing emotional openness and empathy) and a psychedelic stimulant, and is sometimes sold as or mistaken for MDMA. It is also a metabolite of MDMA, meaning the body converts some MDMA into MDA.

MDA increases release of serotonin, dopamine, and norepinephrine and blocks their reuptake, raising their levels in the brain, which produces its stimulant and empathogenic effects. It also has direct activity at serotonin receptors, giving it more pronounced psychedelic effects than MDMA. This heavy serotonin release underlies both the acute effects and the concern about serotonergic neurotoxicity.

Effects overlap with MDMA — euphoria, emotional warmth, empathy, energy, and heightened senses — but MDA is generally described as more stimulating and more psychedelic, with more visual effects and a longer duration. Physical effects include raised heart rate and blood pressure, jaw clenching, dilated pupils, and reduced appetite, followed by a comedown with low mood and fatigue.

MDA shares MDMA's acute dangers and is thought to carry greater neurotoxic risk. Heavy serotonin and dopamine release strains the cardiovascular system (raised heart rate and blood pressure) and can cause dangerous overheating (hyperthermia), especially with physical exertion in hot environments, and water imbalance — both too little and, dangerously, too much water intake leading to hyponatremia. Combining MDA with other serotonergic drugs — SSRIs, MAOIs, other stimulants, or other empathogens — raises the risk of serotonin syndrome, a potentially fatal reaction with high fever, rigidity, agitation, and rapid heart rate. Longer, more stimulating experiences increase the strain. A critical contamination hazard applies to the illicit supply: substances sold as MDA or MDMA are frequently adulterated or entirely different, and pills and powders in this market have been found to contain illicitly manufactured fentanyl, which can cause fatal respiratory depression. There is no way to confirm identity or dose by eye. Anyone with a very high temperature, seizures, chest pain, collapse, or a severe psychiatric crisis needs emergency care — call 911, and Poison Control at 1-800-222-1222 can advise. This page has not yet been medically reviewed.