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The Quipazine Puzzle: Tiny Dose, Giant Psychedelic Question

The Quipazine Puzzle: Tiny Dose, Giant Psychedelic Question

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The Quipazine Puzzle: Tiny Dose, Giant Psychedelic Question

A single bracketed word - "[sic]" - appeared next to a reported dose of 0.5 mg, implying someone claimed a mescaline-like effect from less than a grain of salt. Quipazine has been studied since 1966, produced LSD-like substitution in animals, and provoked projectile vomiting in primates; so what exactly does it do in the human brain?

In this episode, we trace quipazine’s scientific trail from 1966 through rodent and primate studies, the shifting labels from antidepressant to psychedelic candidate, and the locked doctoral thesis that may hold part of the answer - can one molecule explain both psychedelic and emetic effects at similar doses?

Person: researchers (unnamed) who reported 0.5 mg dose marked "[sic]"
Date: 1966 (first appearance in literature)
Event: 1977 animal studies documenting psychedelic-like behaviors
Topic: serotonin 2-A receptor activation (head-twitch response, ketanserin blockade)
Status: doctoral thesis under embargo until 2030

- Reported dose printed next to the notation "[sic]": 0.5 mg
- First appearance of quipazine in scientific literature: 1966
- By 1971 quipazine described as an antidepressant-like agent
- 1977 animal studies showed head-twitch response indicative of serotonin 2-A activation
- Primate studies produced LSD-like behaviors plus projectile vomiting, linking psychedelic and emetic effects

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