Comparative Study Between the Analgesic Effect of Dexmedetomidine and Magnesium Sulfate As Adjuvant to Bupivacaine Using Ultrasound-Guided Transversus Abdominis Plane Block in Abdominal Hysterectomy : a Randomized Double-blinded Study

patients will receive 18 ml 0.5% bupivacaine (Sunnypivacaine®) using Ultrasound-Guided TAP Block Technique

patients will receive plus 0.5 µg/kg of dexmedetomidine (Precedex® 100 µg/ml) diluted in 2 ml of normal saline at each side

patients will receive plus 1.5 mL (150 mg) MgSO4 and 0.5 mL normal saline at each side