Introduction: Pain is the fifth vital sign and a critical focus of the anaesthesiologist. Pain is perhaps elaborated as an unpleasant sensory and emotional experience associated with actual or potential tissue damage. Acute post operative pain is a complex physiological reaction to tissue-injury, visceral distension or disease. It is manifested by autonomic, psychological and behavioural responses that result in patient specific unpleasant, unwanted sensory and subjective emotional experience. Postoperative pain leads to delayed mobilization and its associated complications. With the development of an expanding awareness of the epidemiology and pathophysiology of pain, more attention is focused on the multimodal management of pain to improve the quality of pain relief, augment functionality, leading to early mobilization, and reduce physiological and emotional morbidity. Hence the present study was done at our tertiary care centre to compare the effectiveness of intrathecal neostigmine (50 mcg) combined with 0.5 % bupivacaine (Hyperbaric) with 0.5 % bupivacaine (Hyperbaric) alone in spinal anaesthesia for infra umbilical surgeries.