Capsaicin cream did not shorten ER stays for cannabinoid hyperemesis, but earlier application helped | Research

The takeaway

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.

Emergency physicians, ER nurses, and clinicians treating cannabinoid hyperemesis syndrome.

Early capsaicin: 4.8 hours to discharge vs. 7.1 hours when given later

What the researchers 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).

Why it 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 numbers in context

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 the study worked

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.

What this study cannot 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.

How to read the evidence

Retrospective with pseudo-randomization; small sample and potential confounding limit conclusions.

When this study was published

Published in 2021.

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.

Questions still open

Should capsaicin be given immediately upon CHS suspicion? Is the timing effect driven by disease severity or genuine early intervention benefit?

Common 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.

Read the original research

Efficacy of topical capsaicin for the treatment of cannabinoid hyperemesis syndrome: A retrospective cohort study.

The American journal of emergency medicine, 43, 142-148

View on PubMed ↗Publisher’s paper ↗

Citation

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