Mescaline (3,4,5-trimethoxyphenethylamine) is a classic serotonergic psychedelic with a history of indigenous ceremonial use. There is renewed scientific interest in mescaline because of the potential psychiatric benefits of psychedelic-assisted therapy. Mescaline primarily exerts its psychoactive effects through serotonin-2A (5-HT 2A ) receptor agonism. There is a lack of controlled clinical...