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Trimethoprim-sulfamethoxazole (TMP-SMX) is widely used to treat urinary tract and soft-tissue infections. Despite anecdotal reports indicating the possibility of TMP-SMX–associated renal toxicity, systematic investigation has been lacking.
To remedy this situation, researchers in Texas reviewed the records of consecutive male inpatients at a Veterans Affairs Medical Center who, during a 3-year period, had received TMP-SMX for ≥6 days to treat urinary tract or soft-tissue infections. All had blood urea nitrogen (BUN) and serum creatinine levels measured both ≤7 days before starting and ≤3 days after completing therapy.
Among 573 patients, 64 (11%) had increases in both BUN and serum creatinine levels that met predetermined criteria for acute k…