RT Journal Article SR Electronic T1 Renal function in patients receiving long-term lithium therapy JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1471 OP 1474 VO 124 IS 11 A1 P. R. Uldall A1 A. G. Awad A1 W. O. McCormick A1 L. B. Carter A1 T. Gonsick A1 C. L. Grass A1 M. I. Kugelmass YR 1981 UL http://www.cmaj.ca/content/124/11/1471.abstract AB Renal function was assessed in 42 stable outpatients who had been taking lithium for an average of 4 1/2 years. Impaired ability to concentrate the urine was found in 61% of the 41 patients who provided a urine sample for an osmolality measurement, and a moderate reduction in creatinine clearance was present in 12% of the entire group; 1 patient showed both defects. Urine microscopy revealed an excess of cells in 40%. It is suggested that lithium therapy produces a self-limiting lesion of the distal nephron that does not usually progress to chronic renal failure. The lesion is not dangerous, except that it may predispose to acute neurotoxic effects in the event of intercurrent illness or dehydration.