. Group M (n = 40) receive 2 ml of 0.5% isobaric levobupivacaine (10 mg) plus 0.5 ml midazolam (2 mg) ) intrathecally

group F (n = 40) receive 2 ml of 0.5% isobaric levobupivacaine (10 mg) plus 0.5 ml fentanyl (25 μg) intrathecally.

Under all aseptic precautions, spinal anaesthesia will be given in L3 and L4 space with 25 gauge Quincke spinal needle via midline approach in sitting position. On free flow of cerebrospinal fluid, study drug will be injected intrathecally . Patients will immediately turn to supine position

2 ml of 0.5% isobaric levobupivacaine (10 mg) plus 0.5 ml midazolam (2 mg)will be given intrathecally in L3 and L4 space with 25 gauge Quincke spinal needle via midline approach in sitting position. On free flow of cerebrospinal fluid, study drug will be injected intrathecally . Patients will immediately turn to supine position

pain will be evaluated using VAS score, every 30 min for 180 min then hourly for 12 h and thereafter every 3 hourly till 24 h of surgery in both groups. Rescue analgesia in the form of injection Ketorolac 30mg I.V when VAS >3 in both groups.

total duration of sensory block (regression to S1 dermatome) will be noted