CBD prevented THC-induced nausea and stress hormone elevation in rats, with the anti-nausea effect working through 5-HT1A serotonin receptors.
Researchers studying cannabinoid hyperemesis syndrome and CBD-THC interactions.
CBD blocked THC-induced nausea via 5-HT1A receptors (p=0.007)
What the researchers found
CBD (5 mg/kg) blocked the establishment of THC-induced conditioned gaping (a measure of nausea) in rats, and this effect was reversed by a 5-HT1A receptor antagonist (WAY-100635). CBD also reversed the THC-induced increase in corticosterone (stress hormone).
Why it matters
Cannabinoid hyperemesis syndrome (CHS) involves intense nausea from high-dose THC use. Understanding how CBD counteracts THC-induced nausea could inform CHS treatment strategies.
The numbers in context
CBD at 5 mg/kg blocked THC-induced gaping (p=0.007). THC at 10 mg/kg significantly increased corticosterone (p=0.04). CBD reversed the corticosterone elevation.
How the study worked
Animal study using conditioned gaping paradigm in rats to measure nausea. Tested CBD pretreatment against THC-induced nausea and used receptor antagonists to identify the mechanism. Serum corticosterone measured to assess stress response.
What this study cannot tell us
Animal study using rats, which cannot vomit. Conditioned gaping is a proxy for nausea. Doses and pharmacokinetics may not translate directly to humans.
How to read the evidence
Well-controlled animal study with clear mechanism identification, but findings need human validation.
When this study was published
Published in 2022.
The bigger picture
This suggests CBD may counteract some of the adverse effects of THC through serotonin pathways, providing a biological rationale for balanced THC:CBD cannabis products.
Questions still open
- Would CBD help manage cannabinoid hyperemesis syndrome in humans? What CBD:THC ratios would be needed to prevent nausea in regular users?
Common questions
What is cannabinoid hyperemesis syndrome?
How did CBD prevent the nausea?
Read the original research
Cannabidiol Interferes with Establishment of Δ9-Tetrahydrocannabinol-Induced Nausea Through a 5-HT1A Mechanism.
Cannabis and cannabinoid research, 7(1), 58-64
Citation
DeVuono, Marieka V; La Caprara, Olivia; Petrie, Gavin N; Limebeer, Cheryl L; Rock, Erin M; Hill, Matthew N; Parker, Linda A. (2022). Cannabidiol Interferes with Establishment of Δ9-Tetrahydrocannabinol-Induced Nausea Through a 5-HT1A Mechanism.. Cannabis and cannabinoid research, 7(1), 58-64. https://doi.org/10.1089/can.2020.0083
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