Postanesthetic shivering is a frequent complication of anesthesia, perhaps even aggravating pain especially during transurethral rsection of prostate (TURP) surgery. Objective: To compare the efficacy of I.V MgSO4 and tramadol to placebo normal saline on incidence and severity of postspinal shivering in geriatric patients undergoing TURP surgery, when used as prophylaxis. Patients and methods: This was a comparative prospective study that included 39 geriatric male patients who scheduled for

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... forming an elective TURP surgery under subarachnoid blockade (SAB) at Zagazig University Hospitals. Patients were divided equally into 3 groups: Group C received isotonic saline after spinal anesthesia, group Mg: received I.V MgSO4 in isotonic saline and group T: received I.V tramadol in isotonic saline after spinal anesthesia. All patients were enrolled for examination before and after surgery. Results: There was no significant difference among the studied groups as regards HR, MAP and Spo2 between the three studied groups. Regarding changes in temperature between the studied groups, C group showed a significant lower temperature time followed by Mg group then T group at different times. There was a significant higher rate of shivering in C group then Mg group and the lowest was T group. Onset of shivering was significantly faster in control then Mg group and longer significantly in Group T. Conclusions: Prophylactic administration of I.V tramadol in a dose of 0.5 mg/kg immediately after SAB could significantly reduce the incidence and severity of postspinal shivering more than I.V MgSO4 in a dose of 15 mg/kg in geriatric patients undergoing TURP surgery.