Comparison Between Intravenous Ondanosteron and Metclopromide Versus Ondanesteron and Dexamethasone Effects on the Prevention of Postoperative Nausea and Vomiting in Cesarean Section

"Group D: Ondanesterone 4mg plus dexamethasone 8mg All the drugs will be prepared and diluted by normal saline in 10 ml syringe by an anesthesiologist who is not included in the study.~The drugs will be slowly injected intravenous 15 minute from spinal anesthesia."

"Group M: ondanesterone 4mg plus metoclopramide 10 mg All the drugs will be prepared and diluted by normal saline in 10 ml syringe by an anesthesiologist who is not included in the study.~The drugs will be slowly injected intravenous 15 minute from spinal anesthesia."