This study examined whether taking the antidepressant escitalopram before using psilocybin affects the drug’s effects. Twenty-three healthy participants took either escitalopram or placebo for two weeks, then received a dose of psilocybin. Surprisingly, escitalopram did not reduce the positive mood effects of psilocybin and actually reduced some negative side effects like anxiety and bad feelings. The combination appeared safe with no increased cardiovascular risks.