A Cannabis-Derived Drug Was No Better Than Standard Medication for Radiation Therapy Nausea | Research

The takeaway

In a randomized trial, the cannabis derivative levonantradol performed similarly to chlorpromazine for preventing vomiting from radiation therapy, with both drugs well tolerated and neither clearly superior.

Read this if you want to understand whether cannabinoid antiemetics work for radiation therapy nausea, not just chemotherapy.

Vomiting frequency was similar across all treatment groups

What the researchers found

Cannabinoid antiemetics had shown promise in chemotherapy, but their use in radiation therapy was largely untested. This trial compared levonantradol, a synthetic cannabis derivative, against chlorpromazine, a standard antiemetic, in patients receiving palliative single-fraction radiation to sites known to cause nausea.

Two doses of levonantradol (0.5 mg and 0.75 mg) were tested against 26 mg chlorpromazine. In both the pilot study and the randomized trial, the frequency of vomiting was similar across all three groups. Both drugs were well tolerated, with most patients treated as outpatients.

Why it matters

While cannabinoid antiemetics showed advantages in chemotherapy settings, this study showed they were not superior for radiation-induced nausea. This distinction matters because different treatments cause nausea through different mechanisms, and a drug that works for one may not work for another.

The numbers in context

Levonantradol doses: 0.5 mg and 0.75 mg. Chlorpromazine dose: 26 mg. Vomiting frequency was similar across all three groups in both the pilot and randomized phases.

How the study worked

Pilot study followed by a randomized trial comparing chlorpromazine (26 mg) with levonantradol at two doses (0.5 and 0.75 mg) in patients receiving palliative single-fraction radiotherapy to sites likely to cause nausea and vomiting.

What this study cannot tell us

The study used palliative single-fraction radiation, which may produce different nausea patterns than multi-fraction regimens. Sample size details were not provided in the abstract. Only two doses of levonantradol were tested.

How to read the evidence

A randomized trial comparing active treatments, but without detailed sample size information and testing only a narrow radiation protocol.

When this study was published

Published in 1982. Modern radiation techniques and antiemetic protocols have evolved substantially.

The bigger picture

This was an early attempt to extend cannabinoid antiemetic use beyond chemotherapy. The neutral result helped define the boundaries of cannabinoid effectiveness and contributed to the understanding that radiation-induced and chemotherapy-induced nausea may involve different pathways.

Questions still open

Would higher doses of levonantradol show an advantage? Do different radiation protocols produce nausea through different mechanisms than chemotherapy? Would THC itself perform differently than this synthetic derivative?

Common questions

Did the cannabis derivative work better than the standard drug?

No. Both levonantradol and chlorpromazine produced similar vomiting rates. Neither was clearly superior.

Is this the same as using marijuana for nausea?

Levonantradol is a synthetic cannabis derivative, not natural marijuana or THC. Results may differ from those seen with natural cannabinoids.

Read the original research

Randomised clinical trial of levonantradol and chlorpromazine in the prevention of radiotherapy-induced vomiting.

Clinical radiology, 33(6), 621-2

View on PubMed ↗

Citation

Lucraft, H H; Palmer, M K. (1982). Randomised clinical trial of levonantradol and chlorpromazine in the prevention of radiotherapy-induced vomiting.. Clinical radiology, 33(6), 621-2.