Background:Sub Arachnoid block is the safe, satisfactory and most commonly used technique for lower abdominal, pelvic and lower limbs surgeries. The duration of action of Bupivacaine is prolonged; it may not produce adequate post-operative analgesia. Hence adjuvants were used for producing prolonged post-operative analgesia. The aims and objective is to Compare the onset, duration of sensory and motor blockade and requirement of post-operative analgesia with dexmedetomidine vs fentanyl as adjuvants to intrathecal 0.5% hyperbaric bupivacaine Secondary Objectives were compare the hemodynamic effects of adding dexmedetomidine vs fentanyl as adjuvants to intrathecal bupivacaine. Materials and Methods: Patients were allocated into one of the three groups of 50 each using computer generated random number. Patients were counselled regarding the procedures.