Question 1

What is the difference between ketamine and psilocybin?

Accepted Answer

Ketamine is a dissociative anesthetic acting on NMDA glutamate receptors, while psilocybin is a classical psychedelic acting on 5-HT2A serotonin receptors. The most significant practical difference is legal status: ketamine is the only psychedelic-adjacent substance available through legal clinical treatment in the US (for depression). Psilocybin remains Schedule I federally. Ketamine carries addiction potential; psilocybin does not. Both show promising results for treatment-resistant depression.

Question 2

Is ketamine safer than psilocybin?

Accepted Answer

Each substance has a distinct risk profile. Ketamine has a narrower therapeutic window, carries addiction/dependence potential, and can cause bladder damage with chronic heavy use. Psilocybin has an extremely wide safety margin, no addiction potential, and no known organ toxicity, but can trigger psychological distress in vulnerable individuals. Ketamine's advantage is legal clinical availability and shorter duration (45-90 minutes vs 4-6 hours), making it easier to administer in clinical settings.