Capsaicin cream did not shorten ER stays for cannabinoid hyperemesis, but earlier application helped
In 55 CHS patients, topical capsaicin did not significantly shorten ER stays compared to no capsaicin overall, but patients who received it within the first two rounds of treatment were discharged significantly faster.
Quick Facts
What This Study Found
No overall difference in time to discharge between capsaicin (4.46 hours) and no capsaicin (3.52 hours) groups. However, patients receiving capsaicin within the first two medication rounds had significantly shorter stays than those receiving it later (4.83 vs. 7.09 hours, p=0.01).
Key Numbers
Patients: 55 (35 capsaicin, 20 control). Time to discharge: 4.46 vs. 3.52 hours (p=0.10). Early capsaicin: 4.83 vs. 7.09 hours (p=0.01). Bounceback within 24h: 11% vs. 10%. Admission: 19% vs. 5% (p=0.07).
How They Did This
Retrospective observational study of 55 CHS patients (35 capsaicin, 20 no capsaicin). Capsaicin allocation was pseudo-randomized based on pharmacist availability. Outcomes included time to discharge, medication rounds, bounceback rate, and admission rate.
Why This Research Matters
Capsaicin cream has been promoted as a novel CHS treatment, but this study suggests its benefit depends on early administration rather than being universally effective.
The Bigger Picture
The timing-dependent effect suggests capsaicin may work best before CHS symptoms become fully established, which could inform ER protocols for suspected CHS cases.
What This Study Doesn't Tell Us
Small sample size. Retrospective design. Pseudo-randomization may introduce bias. Capsaicin group had a non-significant trend toward higher admission rates, possibly indicating more severe cases.
Questions This Raises
- ?Should capsaicin be given immediately upon CHS suspicion?
- ?Is the timing effect driven by disease severity or genuine early intervention benefit?
Trust & Context
- Key Stat:
- Early capsaicin: 4.8 hours to discharge vs. 7.1 hours when given later
- Evidence Grade:
- Retrospective with pseudo-randomization; small sample and potential confounding limit conclusions.
- Study Age:
- Published in 2021.
- Original Title:
- Efficacy of topical capsaicin for the treatment of cannabinoid hyperemesis syndrome: A retrospective cohort study.
- Published In:
- The American journal of emergency medicine, 43, 142-148 (2021)
- Database ID:
- RTHC-03631
Evidence Hierarchy
Looks back at existing records to find patterns.
What do these levels mean? →Frequently Asked Questions
Does capsaicin cream help with cannabinoid hyperemesis syndrome?
Not consistently. When given early in the ER visit, it was associated with shorter stays, but overall it did not shorten time to discharge compared to no capsaicin.
When should capsaicin be applied for CHS?
The study suggests applying it within the first two rounds of treatment, when patients who received early capsaicin were discharged in 4.8 hours vs. 7.1 hours for late application.
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Cite This Study
https://rethinkthc.com/research/RTHC-03631APA
Yusuf, Hamzah M; Geier, Curtis; Staidle, Alex; Montoy, Juan Carlos C. (2021). Efficacy of topical capsaicin for the treatment of cannabinoid hyperemesis syndrome: A retrospective cohort study.. The American journal of emergency medicine, 43, 142-148. https://doi.org/10.1016/j.ajem.2021.01.073
MLA
Yusuf, Hamzah M, et al. "Efficacy of topical capsaicin for the treatment of cannabinoid hyperemesis syndrome: A retrospective cohort study.." The American journal of emergency medicine, 2021. https://doi.org/10.1016/j.ajem.2021.01.073
RethinkTHC
RethinkTHC Research Database. "Efficacy of topical capsaicin for the treatment of cannabino..." RTHC-03631. Retrieved from https://rethinkthc.com/research/yusuf-2021-efficacy-of-topical-capsaicin
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.