Therapeutic study of the nausea and vomiting caused by chemotherapy medications by olanzapine to triple antiemetic therapy in Iraqi cancer patients

Background:Chemotherapy-caused nausea and vomiting is a health problem in cancer patients. Olanzapine is used with serotonin receptor antagonists plus dexamethasone post Neurokinin 1 receptor antagonists as the antiemetic. Objective: The study aimed to determine the efficacy of (5 and 10) mg of olanzapine with antiemetic drugs against chemotherapy-induced nausea and vomiting. Methods: The study groups are Group S: received triple antiemetic therapy aprepitant at (1-3) day, dexamethasone at (1-4) day, and ondansetron only on the first day. Group O5: received olanzapine 5 mg with triple antiemetic therapy aprepitant (1-3) days, dexamethasone (1-4) day, ondansetron the first day, and olanzapine 5 mg (1-4) days. Group O10: received (olanzapine 10 mg with triple antiemetic therapy) aprepitant (1-3) days, dexamethasone (1-4) days, ondansetron day 1, and olanzapine 10 mg (1-4) days. The cancer was diagnosed by mamograph; the MAT score was used to control chemotherapy-caused nausea and vomiting. Results: Higher acute and delayed nausea was observed in group S than in groups O5 and O10. Overall, nausea control was increased in group S than in groups O5 and O10. There was no significant difference between the different study groups. Conclusion: Olanzapine 5 mg and 10 mg could treat nausea more than triple antiemetic in patients with nausea.