Hallucinogens are compounds that induce hallucinations and often other psychotic phenomena. They include dissociatives (NMDA antagonists and kappa opioid agonists) and psychedelics (LSD and psilocybin).

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Which Receptors are involved in Psychedelia/Psychosis?

Which receptors are involved in Psychedelia/Psychosis? I know that the 5-HT2A, 5-HT3, D2, κ-opioid and NMDA receptors are likely involved in psychosis.
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How long have mushrooms of the genus Psilocybe been present in the Balkans (Eastern Europe)?

I and a friend of mine had a debate about Psilocybe genus mushrooms in the Balkans. He said that they were brought to the Balkans by people and that there were not any Psilocybe mushrooms there ...