To assess the efficacy of neostigmine and magnesium sulphate on characteristics of subarachnoid block, hemodynamic stability and postoperative analgesia, when added to 0.5% hyperbaric bupivacaine, in patients undergoing infraumblical surgeries. Material and Methodology: In this randomised study, double blind study, 60 adult patients of American society of anaesthesiologist status I and II, aged between 18-50 years, of either sex (M & F), scheduled for elective infraumblical surgeries were assigned in two groups. The patients were randomly allocated to receive bupivacaine 3ml [15 mg] with preservative free magnesium sulphate 0.5 ml [50mg] in group I and Group II patients received bupivacaine (3ml) with neostigmine 0.5 ml [25µg]. We recorded the following parameters. Duration of sensory & motor blockade, quality of block, perioperative vitals and duration of post operative analgesia.