Spinal anaesthesia using only local anaesthetics is associated with relatively short duration of action. Postoperative pain control is a major problem with spinal anaesthesia using only local anaesthetics alone, and thus early analgesic intervention is needed in postoperative period. Various adjuvants such as morphine, Opioids, Dexamethasone, Magnesium sulphate etc., have been studied to prolong the effect of spinal anaesthesia. This study is designed to compare the effect of adding Dexamethasone and magnesium sulphate to hyperbaric Bupivacaine in lower abdominal surgeries. Total of 80 adult patients aged between 18-50 years undergoing lower abdominal and lower limb surgeries. After institutional ethical committee approval, 80 patients aged between 18-50 years undergoing lower abdominal and lower limb surgeries are selected. Patient pain was assessed with VAS at 30 min post operatively and following results were observed. Mean VAS for D group was 4.5 and mean VAS for M group was 5.2. Hence it is observed that addition of Dexamethasone to bupivacaine had a better analgesic effect than Magnesium sulphate.