This study examines how antidepressant medications (like SSRIs) affect the experience of classic psychedelics such as psilocybin and LSD. Researchers found that people taking these antidepressants experienced less intense emotional and mystical effects from psychedelics, but surprisingly, both groups showed similar improvements in mood and well-being several weeks later. This raises important questions about whether patients need to stop their antidepressants before using psychedelics therapeutically.