Postoperative nausea and vomiting (PONV) is a distressing adverse effect that may result in postoperative complications including bleeding, wound dehiscence, aspiration pneumonitis, as well as fluid and electrolyte imbalances Incidence of PONV after general anesthesia is about 30% in all post-surgical patients but up to 80% in high-risk patients despite advances in anesthetics and anesthesia techniques