MDMA
A synthetic amphetamine analogue that preferentially releases serotonin, producing empathogenic and stimulant effects with documented neurotoxic potential.
Preclinical and clinical studies demonstrate that MDMA can elicit acute and persistent central abnormalities of varying severity, with neurotoxic effects on dopaminergic and serotonergic neurons demonstrated in experimental animals. MDMA-assisted psychotherapy has shown therapeutic potential for PTSD, with meta-analyses indicating significant reductions in CAPS scores compared to control psychotherapy, though statistical heterogeneity is high and risk of bias in trials is a concern. Side effects in clinical trials are largely transient and mild to moderate in severity, but evidence quality ranges from very low to moderate per GRADE assessment. MDMA-drug interactions are clinically significant, particularly with CYP2D6-metabolized pharmaceuticals due to MDMA's inhibitory action, and repeated MDMA administration increases interaction risk. Long-term damage to the serotonergic system has been reported, though further investigation is needed.