Methods
subarachnoid block
It is a Prospective Randomized Double-Blind Study. It includes 68 patients undergoing urological procedures under subarachnoid block. Group LD: Patients will receive 3.5 ml of Isobaric Levobupivacaine 0.5% + Dexmedetomidine 10 µg (0.1ml) Group RD: will receive 3.5ml of Isobaric Ropivacaine 0.5% + Dexmedetomidine 10 µg (0.1ml)