Psilocybin in Treatment-Resistant Depression

Depression ranks first among psychiatric disorders that dominate the global burden of disease, posing a substantial personal strain and economic drain on nations.1 At least 30 drugs are Food and Drug Administration (FDA)–approved to treat depression,2 yet a systematic review and meta-analysis of 22 antidepressants concluded that although they were more effective than placebo in adults with major depressive disorder, effect sizes were mostly modest and tempered by an array of side effects.3 Because medicine abhors a therapeutic vacuum, the hallucinogens (psychedelic agents) psilocybin and lysergic acid diethylamide (LSD) are being revisited as potential candidate medications decades after their demise in . . .