Does topical capsaicin cream work for cannabinoid hyperemesis syndrome?
A systematic review and meta-analysis of 7 studies with 106 patients found that topical capsaicin provided symptom relief for cannabinoid hyperemesis syndrome with an average time to resolution of about 325 minutes.
Quick Facts
What This Study Found
Across 7 included studies (106 patients), topical capsaicin appeared effective for CHS symptom relief. Mean time to symptom resolution was 325 minutes (95% CI 234-787), and ED length of stay averaged 379 minutes (95% CI 10-747). Heterogeneity was acceptable (I-square 44%, Q-statistic p=0.1).
Key Numbers
328 studies screened; 7 included; 106 total patients; mean time to symptom resolution: 325 minutes; mean ED length of stay: 379 minutes; I-square: 44%
How They Did This
Systematic review and meta-analysis searching PubMed, SCOPUS, and Google Scholar through October 2020. From 328 initial studies, 7 met inclusion criteria. Evaluated hospital admission rates, time to symptom relief, and ED length of stay.
Why This Research Matters
Cannabinoid hyperemesis syndrome is increasingly recognized in emergency departments, and standard treatments (antiemetics, antipsychotics, benzodiazepines) are not always effective. Topical capsaicin is a low-cost, low-risk alternative that works through a different mechanism (TRPV1 agonism).
The Bigger Picture
The mechanism makes biological sense: capsaicin activates TRPV1 receptors, which interact with the endocannabinoid system. This receptor-level explanation supports the clinical observations and suggests a biologically plausible treatment pathway for CHS.
What This Study Doesn't Tell Us
Only 7 studies with 106 total patients. No randomized controlled trials included. Wide confidence intervals reflect uncertainty. Heterogeneous study designs and capsaicin application protocols.
Questions This Raises
- ?What is the optimal capsaicin concentration and application area for CHS?
- ?Could capsaicin be used as a first-line treatment instead of traditional antiemetics?
- ?Why does capsaicin work for CHS when standard antiemetics often fail?
Trust & Context
- Key Stat:
- 106 patients across 7 studies
- Evidence Grade:
- Systematic review and meta-analysis, but limited to small, non-randomized studies with wide confidence intervals.
- Study Age:
- Published in 2021; more rigorous trials of capsaicin for CHS are needed.
- Original Title:
- Topical capsaicin for the treatment of cannabinoid hyperemesis syndrome, a systematic review and meta-analysis.
- Published In:
- The American journal of emergency medicine, 43, 35-40 (2021)
- Authors:
- Pourmand, Ali, Esmailian, Gabriel, Mazer-Amirshahi, Maryann(2), Lee-Park, Owen, Tran, Quincy K
- Database ID:
- RTHC-03437
Evidence Hierarchy
Combines results from multiple studies to find an overall pattern.
What do these levels mean? →Frequently Asked Questions
What is capsaicin and how does it help CHS?
Capsaicin is the compound that makes chili peppers hot. Applied topically (as a cream), it activates TRPV1 receptors that interact with the endocannabinoid system. This appears to relieve the severe nausea and vomiting of CHS.
How quickly does capsaicin work for CHS?
In the pooled analysis, mean time to symptom resolution was about 325 minutes (approximately 5.4 hours). However, confidence intervals were wide, and some patients likely responded faster while others took longer.
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Cite This Study
https://rethinkthc.com/research/RTHC-03437APA
Pourmand, Ali; Esmailian, Gabriel; Mazer-Amirshahi, Maryann; Lee-Park, Owen; Tran, Quincy K. (2021). Topical capsaicin for the treatment of cannabinoid hyperemesis syndrome, a systematic review and meta-analysis.. The American journal of emergency medicine, 43, 35-40. https://doi.org/10.1016/j.ajem.2021.01.004
MLA
Pourmand, Ali, et al. "Topical capsaicin for the treatment of cannabinoid hyperemesis syndrome, a systematic review and meta-analysis.." The American journal of emergency medicine, 2021. https://doi.org/10.1016/j.ajem.2021.01.004
RethinkTHC
RethinkTHC Research Database. "Topical capsaicin for the treatment of cannabinoid hyperemes..." RTHC-03437. Retrieved from https://rethinkthc.com/research/pourmand-2021-topical-capsaicin-for-the
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.