Can psychedelics cause serotonin toxicity (syndrome)?

Question from a Member: Can’t serotonin syndrome/toxicity also be caused by psilocybin plus an SSRI? I have always counseled patients about that because more and more are taking low (and high) doses of psilocybin recreationally. Why this question is an important one The terms “classic psychedelics”, or “classic hallucinogens” refer to a group of hallucinogens,…