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.
CHS researchers, emergency physicians, pharmacologists studying nausea mechanisms
Standard anti-emetic ondansetron failed; 6 stress-response inhibitors and a benzodiazepine worked
What the researchers 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.
Why it 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 numbers in context
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 the study worked
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.
What this study cannot 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.
How to read the evidence
Comprehensive mechanistic animal study testing multiple pharmacological targets.
When this study was published
Published in 2020.
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.
Questions still open
- Would CRH antagonists be effective treatments for CHS in humans? Could endocannabinoid enhancers prevent CHS in chronic users?
Common questions
Why don't regular anti-nausea drugs help with CHS?
What does work for CHS-related nausea?
Read the original research
Role of the stress response and the endocannabinoid system in Δ9-tetrahydrocannabinol (THC)-induced nausea.
Psychopharmacology, 237(7), 2187-2199
Citation
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
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