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Concurrent norfloxacin concentrations in serum, kidney, and prostatic tissue were determined in 14 patients. Mean ratios of norfloxacin concentration in tissue over concentration in serum were 6.6 +/- 2.8 for the kidney and 1.7 +/- 0.2 for the prostate samples. The levels were above the MICs of most urinary pathogens.
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