Chemotherapy Nausea
One of the best-established uses — synthetic THC (dronabinol, nabilone) has been approved for it for decades.
Digestive Strong
What the research says
This is the strongest evidence in the entire field. Synthetic THC (dronabinol/Marinol, nabilone/Cesamet) has been FDA-approved for chemotherapy-induced nausea and vomiting since the 1980s, and the WHO's systematic review confirmed cannabinoids are at least as effective as standard antiemetics in some comparisons. A 2025 meta-analysis of 26 studies in Supportive Care in Cancer reached the same conclusion: cannabinoids were superior to placebo for chemo nausea and vomiting, though the trials that informed it predate the modern antiemetic regimens used today.
The reason you still hear 'more studies needed' is that most trials are older and used synthetic THC rather than whole-flower products. But the mechanism and the efficacy signal are real — this is a legitimate, guideline-recognized use.
The honest caveats
If you're actively on chemo, talk to your oncologist before adding anything — drug interactions and timing matter, and modern antiemetic regimens are very good. Inhaled cannabis acts fast for breakthrough nausea but the dose is hard to control. CBD-dominant or THC-containing oils can help but take longer to kick in.
One area with genuinely interesting data is CBDA — CBD's raw precursor. A landmark rat study found CBDA suppressed nausea at remarkably low doses and even strengthened the standard anti-nausea drug ondansetron. That's rodent data, not a human recommendation, but it's a specific, citable line of research worth raising with your oncologist.
Compounds to explore
These are the compounds — terpenes and cannabinoids — that the research connects to this condition. They are starting points for reading a COA or choosing a product, not prescriptions. Each has its own guide with more detail.
Cannabinoid THC The active ingredient in the FDA-approved nausea drugs dronabinol and nabilone. Cannabinoid CBD May add benefit for some; usually combined with THC in research. Terpene limonene Settles the stomach in traditional use; sometimes called the 'nausea' terpene. Cannabinoid CBDA A landmark rat study found it suppressed nausea at very low doses and even strengthened ondansetron — promising rodent data, not yet human proof. Cannabinoid d8-THC A pharmacologic review notes the same kind of anti-nausea effects as d9-THC at lower strength — with a milder intoxicating profile.