Inclusion criteria:  ASA I-II Age 20-40 years. Pregnant women with living fetus. Body mass index 20- 35 kg/m2.  Exclusion criteria:  Patient refusal. Age < 20 or > 40 years Body mass index < 20 or > 35. Contraindication to spinal anesthesia (severe mitral or aortic stenosis, coagulopathy, Systemic or local infection, increased intracranial pressure and hypovolemia). Placental abnormalities: placental abruption, placenta previa or accrete. Allergy to drugs used in the study.