THC-induced nausea involves stress response dysregulation and is not blocked by standard anti-nausea drugs
THC-induced nausea in rats was blocked by stress-response inhibitors and benzodiazepines but not by ondansetron (a standard anti-emetic), supporting the theory that cannabinoid hyperemesis syndrome is a stress-mediated condition.
Quick Facts
What This Study Found
Antalarmin (CRH antagonist), MJN110 (2-AG elevator), URB597 (AEA elevator), propranolol, WAY-100635, and chlordiazepoxide all blocked THC-induced conditioned gaping. The standard anti-emetic ondansetron did not. THC at 10 mg/kg significantly elevated corticosterone compared to 0.5 mg/kg, showing dose-dependent HPA activation.
Key Numbers
6 different stress-response inhibitors blocked THC nausea. Ondansetron at 0.1 and 0.01 mg/kg did not. THC 10 mg/kg produced significantly higher corticosterone than 0 or 0.5 mg/kg.
How They Did This
Male rats in a conditioned gaping model of nausea. THC (10 mg/kg) paired with saccharin. Pre-treatments tested: CRH antagonist, endocannabinoid enhancers (MJN110, URB597), propranolol, WAY-100635, ondansetron, chlordiazepoxide. Corticosterone measured at different THC doses.
Why This Research Matters
This explains why CHS patients do not respond to standard anti-nausea medications but find relief from hot showers and benzodiazepines: the nausea is driven by stress pathway activation, not the typical serotonin-mediated mechanism.
The Bigger Picture
This mechanistic work suggests CHS treatment should target the stress response (CRH antagonists, benzodiazepines, or endocannabinoid modulators) rather than traditional anti-emetic pathways.
What This Study Doesn't Tell Us
Animal model; male rats only; conditioned gaping is a proxy for nausea; high-dose acute THC may not fully recapitulate chronic CHS in humans.
Questions This Raises
- ?Would CRH antagonists be effective treatments for CHS in humans?
- ?Could endocannabinoid enhancers prevent CHS in chronic users?
Trust & Context
- Key Stat:
- Standard anti-emetic ondansetron failed; 6 stress-response inhibitors and a benzodiazepine worked
- Evidence Grade:
- Comprehensive mechanistic animal study testing multiple pharmacological targets.
- Study Age:
- Published in 2020.
- Original Title:
- Role of the stress response and the endocannabinoid system in Δ9-tetrahydrocannabinol (THC)-induced nausea.
- Published In:
- Psychopharmacology, 237(7), 2187-2199 (2020)
- Authors:
- DeVuono, Marieka V(10), La Caprara, Olivia(2), Sullivan, Megan T, Bath, Alexandra, Petrie, Gavin N, Limebeer, Cheryl L, Rock, Erin M, Hill, Matthew N, Parker, Linda A
- Database ID:
- RTHC-02514
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Why don't regular anti-nausea drugs help with CHS?
This study found that THC-induced nausea operates through the stress response (HPA axis) rather than the serotonin pathway targeted by standard anti-emetics like ondansetron. This explains clinical reports that ondansetron is ineffective for CHS.
What does work for CHS-related nausea?
In rats, drugs that block the stress response (CRH antagonists, beta-blockers, endocannabinoid enhancers) and benzodiazepines all reduced THC-induced nausea. This aligns with clinical observations that benzodiazepines and hot showers (which reduce stress) help CHS patients.
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Cite This Study
https://rethinkthc.com/research/RTHC-02514APA
DeVuono, Marieka V; La Caprara, Olivia; Sullivan, Megan T; Bath, Alexandra; Petrie, Gavin N; Limebeer, Cheryl L; Rock, Erin M; Hill, Matthew N; Parker, Linda A. (2020). Role of the stress response and the endocannabinoid system in Δ9-tetrahydrocannabinol (THC)-induced nausea.. Psychopharmacology, 237(7), 2187-2199. https://doi.org/10.1007/s00213-020-05529-5
MLA
DeVuono, Marieka V, et al. "Role of the stress response and the endocannabinoid system in Δ9-tetrahydrocannabinol (THC)-induced nausea.." Psychopharmacology, 2020. https://doi.org/10.1007/s00213-020-05529-5
RethinkTHC
RethinkTHC Research Database. "Role of the stress response and the endocannabinoid system i..." RTHC-02514. Retrieved from https://rethinkthc.com/research/devuono-2020-role-of-the-stress
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.