Concentrations of norfloxacin in prostatic tissues following oral administration in patients with benign prostatic hyperplasia.

For assessing plasma and tissue concentrations of norfloxacin after oral administration, twelve patients with benign prostatic hypertrophy (BPH) were given two doses of 400 mg norfloxacin approximately 12 hours apart prior to transurethral resection of the prostate (TURP). Prostatic tissue samples and blood samples were collected and assayed for norfloxacin content by HPLC. The mean peak norfloxacin concentration in plasma was 1.63 micrograms/ml (range 0.63 to 3.38 micrograms/ml). The mean peak concentration in prostatic tissue was 1.63 micrograms/g (range 0.75 to 3.30 micrograms/g). The plasma and prostatic tissue levels of norfloxacin exceeded the MIC's of most urinary tract pathogens. The data suggest that norfloxacin may be useful in the treatment of chronic bacterial prostatitis.