All sorts of medical drugs have contraindications- that’s why we have doctors prescribe them in the first place. E.g., you have severe sleep apnea, you shouldn

All sorts of medical drugs have contraindications- that’s why we have doctors prescribe them in the first place. E.g., you have severe sleep apnea, you shouldn’t use benzodiazepines; if you have bad anxiety you shouldn’t take address; etc etc. LSD will take a bit more diligence (it’s powerful!) but is not qualitatively different in that respect.