Hyoscine Butylbromide for Prevention of Bradycardia During Cesarean Section

Inclusion Criteria: * ASA physical status class I-II. * Age: 18 Years to 40 Years. * Women scheduled for elective Cesarean section under spinal anesthesia. * indications for CS other than fetal or maternal pathology. Exclusion Criteria: * Height \< 150 or \> 180 cm * Body mass index (BMI) \>35 kg/m2 * Contraindication for central neuraxial block * Refusal to undergo regional anesthesia * Known allergy to any of the study drugs, * Infection at the site of injection, * Coagulopathy, * Indication to general anesthesia * Baseline bradycardia (heart rate \< 60/min), or any cardiovascular disease * Patients taking β-adrenergic blockers or any drugs that may alter normal response to study drugs. * Arrhythmia such as atrial fibrillation, supraventricular tachycardia, heart block greater than first degree, left bundle branch block, * Hypertension (systolic blood pressure more than 140 mm Hg or diastolic blood pressure more than 90 mm Hg), unstable angina or cardiomyopathy, * Associated medical problem with pregnancy (as hypertension, diabetes mellitus, hepatic impairment or renal impairment)