How do drugs affect the brain?

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Question: How do drugs affect the brain?
Position1 of 3›: Hallucinogens alter perception and cause hallucinations

Hallucinogenic substances interact with receptor molecules in the brain, including acetylcholine, glutamate, and serotonin receptors, with a range of effects from perceptual changes to hallucinatory experiences.

Supporting arguments · 2

Psychedelics trigger psychedelic experiences
Psychedelic experiences involve a feeling of altered or expanded consciousness, and may involve hallucinations.
Dissociatives cause feelings of detachment from reality
Dissociatives such as ketamine distort perceptions and cause a sense of dissociation from the self.