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What is the primary mechanism of action of classical psychedelics?

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What is the primary mechanism of action of classical psychedelics?
mechanism
Agonist or partial agonist action at serotonin 5-HT2A receptors. This is the consensus mechanism. Glutamate signaling in the prefrontal cortex plays a significant secondary role. Neither serotonin flood nor dopamine, 5-HT2A is the key target.
basic