Hallucinogen pharmacology and effects

The manuals converge on the need for working knowledge of psilocybin’s acute effects, especially altered perception, mood and cognition changes, anxiety, nausea, and transient increases in blood pressure or heart rate. They also agree that this knowledge supports preparation, monitoring during dosing, and distinguishing expected psychedelic phenomena from more concerning reactions. Several extracts also link these effects to therapeutic processes, including insight, emotional breakthrough, spirituality, openness, and behaviour change. Where they differ is mainly in emphasis and scope. Some manuals focus on psilocybin specifically, while others extend the same competency to LSD or to comparison drugs such as risperidone and diphenhydramine. A few extracts place stronger weight on physiologic safety and medication interaction risks, including serotonin syndrome, QT-related risk factors, psychosis, mania, and contraindicated medications, while others emphasise phenomenology, session structure, or the therapeutic model of psilocybin as an adjunct to psychotherapy. The duration estimates also vary across sources, with psilocybin effects described as lasting about five to six hours, several hours, or up to six hours, while LSD is described as lasting 10 to 12 hours.