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Doxycycline levels in prostatic tissue and blood.

Doxycycline was administered orally to 23 patients scheduled for prostatectomy or radical cystectomy. Blood and prostatic tissue samples were collected simultaneously during operation and subsequently assayed for doxycycline levels. The concentration of doxycycline in the prostatic tissue was on average 2.75 mug/g which is far above the therapeutic level. The lowest level recorded was 0.85 mug and the highest was 4.81 mug. The findings suggest a tendency for this antibiotic to accumulate in prostatic tissue. This is in agreement with the clinical observations of the good effect of doxycycline treatment in patients with chronic bacterial prostatitis.