A molecule proving psychedelic in animals for decades - blocked entirely by nausea
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A molecule proving psychedelic in animals for decades - blocked entirely by nausea
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A single compound produced the classic head‑twitch and substituted for LSD across decades of rodent studies, yet it never advanced in humans - because the same molecule caused projectile vomiting in primates that rodents cannot report. How did a reproducible psychedelic signal in animals get concealed by a basic anatomical difference, and what does that mean for interpreting decades of serotonin research?
In this episode, we lay out the experimental trail from the compound’s 1966 synthesis through repeated rodent assays and primate trials, and follow how an ordinary physiological effect altered the course of scientific and clinical judgment. What happens when a reliable animal marker misses the one symptom that would make all the difference?
Person: quipazine (one-(2-quinolinyl)piperazine)
Date: 1966 (synthesis), 2007 (recording mentioned)
Topic: serotonergic psychedelic activity and head-twitch response
Event: projectile vomiting observed in primate trials
Period: 1960s-2000s (decades of animal studies)
- The compound quipazine was synthesized in 1966 and later used as a serotonin receptor probe.
- In the 1970s, quipazine reliably produced the mouse head-twitch response, a standard marker of psychedelic-like serotonergic activity.
- Drug-discrimination studies showed animals trained on LSD pressed the same lever when given quipazine, indicating subjective equivalence in nonverbal assays.
- Rodents cannot vomit anatomically, so rodent studies could not reveal nausea or emesis caused by quipazine.
- Primate trials showed LSD-like behaviors accompanied by projectile vomiting, halting further meaningful human trials.
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