“Dronabinol (MARINOL), synthetic tetrahydrocannabinol, binds to cannabinoid receptors and has antiemetic activity. To explore if this novel mechanism would be of benefit in delayed CINV, dronabinol was added to the prophylactic regimen for acute CINV and continued after chemotherapy.

Efficacy at Endpoint (LOCF) Conclusions: Dronabinol (D) was comparable to ondansetron (O) in total response and but was more effective in reducing nausea intensity and vomiting/retching. Results for the combination of DO were similar to either agent alone.

These results support conducting a larger study since D could become an attractive alternative to serotonin receptor antagonists in treating delayed CINV.”

https://www.ncbi.nlm.nih.gov/pubmed/27946578