Assiut university researches PRE-OPERATIVE ORAL GABAPENTIN VERSUS TROPISETRON FOR PREVENTION OF INTRATHECAL MORPHINE INDUCED NAUSEA AND VOMITING AFTER MAJOR ABDOMINAL CANCER SURGERY Khaled M. Fares, MD and Sahar A. Mohamed, MD. Abstract: ABSTRACT Unfortunately spinal morphine is associated with high incidence of pruritus and emetic symptoms which can limit its use. The aim of this study was to compare the efficacy of preoperative oral Gabapentin versus tropisetron on postoperative nausea and vomiting after major abdominal surgery under combined spinal and general anesthesia. Ninety patients randomly assigned into three groups 30 patients each; group Control received placebo, group Gabapentin received 600 mg of gabapentin and group Tropisetron received 5 mg tropisetron orally 2 hours before surgery. Frequency and severity of PONV, pruritus, pain severity, time to first request of rescue analgesic and incidence of side effects were recorded in the 1st 24 hours postoperative. Incidence of PONV in Gabapentin and Tropisetron group decreased compared to Control group (p Key words: gabapentin; tropisetron; intrathecal morphine; nausea; vomiting. Published in: Journal Of Egyption Society for Management Of Pain,Vol 29 NO 2,