Spinal anaesthesia will be given with 25G Quinke's needle in sitting position. Under all aseptic precautions and depending upon the groups, respective agents will be injected intrathecally.That is Group BC15 will be given 2ml of hyperbaric bupivacaine 0.5%with 15 mcg clonidine intrathecally; Group BC30 will be given 2ml of hyperbaric bupivacaine 0.5% with 30 mcg clonidine intrathecally;Group BC60 will be given 2ml of hyperbaric bupivacaine 0.5% with 60 mcg clonidine intrathecally Group BF25 will be given 2ml of hyperbaric bupivacaine 0.5% with 25mcg of fentanyl intrathecally.Each group will have a total volume of 2.5 ml made by addition of Normal saline Both the patient and anesthesiologist will be blinded to the study solutions. Syringes will be prepared immediately before the spinal injection ensuring the volumes at 2.5ml by third person knowing the code to blind the Anaesthesiologist administering the drug and later on making the observations. Pulse and blood pressure will be measured every 5 minutes for first 30minutes and thereafter every 10 minutes.Sensory block will be tested by pinprick method. Degree of motor blockade will be assessed by modified Bromage scale. In the intraoperative period, patient will be closely monitored for pulse rate, respiratory rate, SpO2, blood pressure and blood loss.