Background: The incidence of shivering ranges from 40 to 70% in patients undergoing surgery under regional anaesthesia. Shivering is distressing for the patient and may exacerbate post-operative pain, increased intracranial pressure and induce cardiopulmonary complication. Objective: To compare the efficacy, potency and side effects of tramadol versus nalbuphine in control of shivering after spinal anaesthesia Methods: 60 patients of American society of anaesthesiologist grade 1 and 2.patient of either sex aged 18 to 60years who are scheduled for lower abdominal and lower limb surgery, under intrathecal block, were included this prospective double blind randomized study. These patients were allocated by closed envelop technique to two groups: Group T (n=30) received tramadol 0.5mg/kg (intravenously) IV, and Group N (n=30) received nalbuphine 0.1mg/kg IV. Heart rate, respiratory rate, non-invasive arterial blood pressure, peripheral oxygen saturation (SpO 2) and body temperature (axillary) were recorded at 5 minutes intervals during the pre-and the post anesthesia period. After intrathecal injection the degree of sensory and motor block was assessed every 5 minutes in the first 20 minutes after intrathecal injection. The time in minutes at which shivering started, severity of shivering, time of disappearance of shivering and response rate were recorded. Recurrence of shivering was also noticed until the patient left the operation theatre. The degree of sedation was also assessed. Results: No drug showed any statistically significant advantage over other. No major haemodynamic changes were seen in the study groups. Recurrence rate of shivering was same in both groups. Conclusion: Both tramadol (0.5mg/kg) and nalbuphine 0.1mg/kg had the same effect in the treatment of post spinal anaesthesia shivering. With no statically significant difference between them.