Aim: To evaluate the efficacy of dexmedetomidine for prevention of shivering during spinal anaesthesia Methods: 100 patients (ASA grade 1 and 2 age 20–60 year) scheduled under spinal anaesthesia with injection bupivacaine 0.5% heavy.They were administered saline (group C, n=50) or dexmedetomidine (group D ,n=50).Motor block was assessed  by Modified Bromage scale. The presence of shivering was assessed by blinded observer after  completion of subarachnoid  injection. Results: Shivering was observed in 4 patients (8%) in group D and 24 patients (48%) in  group C (p<0.0001).The intensity of shivering was lower in group D than with group C (p<0.0001).Sedation scores were higher in group D than in group C (p<0.0001) Conclusion :Dexmedetomidine infusion rendered a significant reduction in the frequency and severity of shivering associated with spinal anaesthesia with better sedation profile and with acceptable side effects