Psilocybin is classified as a serotonergic psychedelic and a prodrug of psilocin (4-hydroxy-dimethyltryptamine), which converts to the active form once ingested.
1 The theoretical mechanism of action involves binding to serotonin
2A (5-HT
2a) predominantly in the amygdala, thalamus, and prefrontal cortex. The psychopharmacologic profile of psilocybin was examined in the 1960s. It was proposed that oral administration of approximately 10 mg was needed to induce psychological effects, with more potent effects developing with increasing doses.
2-4 Psilocybin’s psychological effects were comparable to those of lysergic acid diethylamide, but thought to be more vividly visual, less emotionally intense, more euphoric, and less likely to cause panic attacks or paranoia.
4 Clinical studies suggest psilocybin produces an antidepressant benefit in patients with treatment-resistant depression.
5 This impact is believed to be connected to its affinity for the serotonergic pathway in the brain, which is essential in controlling mood.
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