Nabilone and Dronabinol are synthetic THC derivatives and clinical studies have confirmed that Nabilone is effective in reducing nausea. Vomiting was better in patients receiving chemotherapy than the drug. Prochlorperazine, Domperidone, and Alizapride used at that time and has been approved for use in Canada since 1982 and clinical research results of Dronabinol It has been found to be effective in reducing nausea. Vomiting better than medication Chlorpromazine and is as effective as the drug Metoclopramide and Thiethylperazine.