Amifloxacin distribution in the dog prostate

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Abstract
Constant infusion experiments with amifloxacin, a quinoline carboxylic acid derivative, were performed in five anesthetized dogs to determine the drug concentrations in prostatic secretion (PS), prostatic interstitial fluid (PIF), prostatic tissue, and plasma (P). The experiments were carried out under steady‐state conditions. Amifloxacin concentrations in PS and PIF were lower than the corresponding P concentrations, as might be expected for an acid compound. There was no significant difference between the PS/P and PIF/P concentration ratios of the drug, and none exceeded 1.0. The concentrations of amifloxacin in PS, PIF, and prostatic tissue were above the minimal inhibitory concentration values of most gram‐positive bacteria causing chronic bacterial prostatitis. Clinical trials of amifloxacin seem justified.