Inclusion Criteria:  Elective uncomplicated cesarean delivery under neuraxial anesthesia >18 year-old with ASA status II or III, with a singleton gestation and a gestational age between 37 to 42 weeks Informed consent to participate in this study  Exclusion Criteria:  Refusal to give written informed consent Allergy or hypersensitivity to oxytocin Body mass index ≥ 40 kg/m2on the day of admission A history of hypertension and/ or severe cardiac disease(s) Contra-indications for neuraxial anesthesia Conditions that predispose to uterine atony and postpartum hemorrhage such as placenta previa, multiple gestation, preeclampsia, macrosomia (≥ 4 kg), polyhydramnios, uterine fibroids in and near operating field, previous history of uterine atony and postpartum bleeding, or bleeding diathesis.