| Summary: | Nausea and vomiting are major concerns for patients undergoing chemotherapy, radiation therapy and surgery with general anesthesia. Risk factors associated with chemotherapy-induced nausea and vomiting include emetogenicity of the chemotherapy regimen, dose, speed of intravenous infusion, female gender, age under 50 years, history of ethanol consumption, and history of prior chemotherapy. Factors predictive of radiation therapy-induced nausea and vomiting include site of irradiation (in particular, total body irradiation and radiation fields that include the abdomen), total field size, dose per fraction, age, and predisposition for emesis (history of sickness during pregnancy or motion sickness). Female gender, a history of motion sickness or prior postoperative nausea and vomiting, nonsmoking status, and use of postoperative opioids have been suggested as factors predictive of postoperative nausea and vomiting. The objective of this review was to evaluate the comparative effectiveness and harms of newer antiemetic drugs including the 5-HT3 and NK-1 antagonists
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