Background: In Spinal anaesthesia, a consequence of impaired thermoregulatory control, shivering is one of the most frequently reported complications of central neuraxial blockade, affecting 40–70% of patients. Nalbuphine is a mixed opioid agonist–antagonist with high afnity for the opioid receptor that functions as both a competitive opioid antagonist and a partial opioid agonist. Theoretically, nalbuphine could have signicant anti-shivering effects on post-anaesthetic shivering. This prospecti Methods: ve randomised (computer-generated) double-blinded study was conducted at Department of Anaesthesiology and Intensive Care, Government Medical College Jammu J&K, after obtaining approval from hospital ethical committee. Randomisation was done using a computer-generated number where patients were randomly allocated into two groups: Group-N and Group-T. We conned our investigation to 84 patients divided into two equal groups of 42 people. The non- Results: signicant difference was observed in age, gender, BMI, ASA physical status, duration of surgery, and duration of spinal anesthesia between the groups. The drug was found to signicantly reduce SBP, increase DBP, and increase MAP in the group given the drug compared to the nalbuphine group. The time taken to control shivering was signicantly shorter in the group-T. The group-T also had a lower Ramsay Sedation Scale score, indicating less sedation compared to the group-N group. The drug did not cause any adverse effects, while sedation, hypotension, and bradycardia were observed in the group-N. Nausea, vomiting, and dizziness were reported in the group-T, but not in the group-N. There was no signicant difference in the effectiveness of shivering control between the two groups. Both i Conclusion: ntravenous nalbuphine 0.05 mg/kg and tramadol 1 mg/kg are effective in managing post-spinal anesthesia shivering. However, tramadol had a shorter time to control shivering than nalbuphine. Both drugs had minimal effects on blood pressure and heart rate, and the side effects observed were minor and treatable