Changes in serum potassium concentration following administration of succinylcholine (1.5mg/kg) were evaluated in 15 cases of donors and 20 cases of reciepients in kidney transplantation.There were no changes prior to and follwing administration of succinrlcho-line in serum potassium levels in the donors and recipients. Changes in serum potassium concentration were also eyaluated in livining-related recipients, in which the donor kidney was flushed with cold Ringer's lactate solution with the amount of about 750 ml. The mean vascular clamping time was 39.5±71.8 minutes. There were no difference between before clamping and following release of the vascular clamp in spite of the interruption of blood flow to the clamped leg. We suggest that succinylcholine in this dose is not contraindicated in patients with chronic renal failure and in the living related recepients who received dornor kidnie which was flushed with Ringer's lactate solution and there is no risk of potassium elevation after relesaing vascular clamp.