Shivering presents as a common perioperative problem causing hypertension, tachycardia and increased metabolic demands. It also interferes with intra-operative monitoring of electrocardiogram, BP, and oxygen saturation. Various risk factors associated with shivering include type and duration of anesthesia, level of sensory blockade, age, temperature of the operating room, and infusion fluids. Hence the present study was planned for clinical outcomes of the patients of intraoperative shivering under spinal anesthesia by comparative administration of Butorphanol and Clonidine. The present study was conducted in Department of Anesthesia, Government Medical College, Bettiah, Bihar, India. The 40 cases underwent the surgeries of lower limb fractures, infra-umblical and urological surgeries. The cases were divided in two study groups. In Group I cases intraoperatively shivering was treated with intravenous Butorphanol 0.015mg/ kg. In Group II cases intraoperatively shivering was treated with intravenous Clonidine 0.5 mg /Kg. The efficacy and response rate of the study drugs were evaluated and recorded. Side effects like, nausea, vomiting, hypotension, sedation were recorded. The data generated from the present study concludes that complete control of post-operative shivering with less or no severe side effects was achieved with Butorphanol in comparisons to clonidine. Butorphanol was found to be safe and effective in prevention and treatment of post-operative shivering with no hemodynamic, cardio respiratory side effect in comparison to Clonidine.