This study will be a double blind randomized, controlled, parallel, study. A total of1 00 morbidly obese patients who will be scheduled for sleeve gastrectomy will be included in the study. The patients will be selected from those attending Gastrointestinal and Laparoscopic Surgery Unit, General Surgery Department, Tanta University Hospital, Tanta, Egypt. The participants will be randomized into two groups by closed envelop method,
The aim of this study is to compare the possible efficacy of ondansetron and gabapentin on postoperative nausea and vomiting in patient with morbid obesity who will undergo laparoscopic sleeve gastrectomy.