Systematic Review Finds Cannabinoids May Help Chemo Nausea but Evidence Against Modern Standards Is Weak

Among 32 studies (1,889 patients), 12 of 22 studies found cannabinoids significantly outperformed now-outdated antiemetics, and 8 of 9 placebo-controlled studies showed benefit. However, only one study compared cannabinoids to modern guideline-based therapy (5-HT3 + NK1 antagonists + dexamethasone), and while it showed benefit, it came with cannabinoid side effects.

Systematic review of 32 studies from five databases comprising 1,889 cancer patients receiving various cannabinoid-based therapies (oral, approved preparations) for chemotherapy-induced nausea and vomiting.

Cannabinoids are often discussed as a solution for chemo nausea, but most evidence compares them to antiemetics that are no longer standard of care. Against modern three-drug antiemetic regimens, the evidence base is nearly nonexistent.

Cancer patients frequently ask about cannabis for chemo side effects. This review reveals a gap between public perception (cannabis helps with chemo nausea) and the actual evidence base, which mostly predates modern antiemetic protocols that are already quite effective.

Most comparator studies used antiemetics no longer considered standard of care. Heterogeneous cannabinoid preparations and dosing across studies. Only oral approved preparations were studied, not the diverse cannabis products patients actually use.