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By using high-performance liquid chromatography, the metabolism and pharmacokinetics of difloxacin were characterized in humans after single oral doses of 200, 400, and 600 mg. Group mean peak levels in plasma were obtained 4 h after administration. The means of the individual peak levels for the 200-, 400-, and 600-mg groups were 2.17, 4.09, and 6.12 micrograms/ml, respectively. The mean respective terminal-phase half-lives were 20.6, 27.1, and 28.8 h; the mean half-life for all subjects was 25.7 h. Within the dose range studied, the behavior of difloxacin could be well described by a set of linear pharmacokinetic parameters with a one-compartment open model. Levels of unconjugated metabolites in plasma were negligible. The major urinary components were difloxacin and its glucuronide, each accounting for roughly 10% of the dose. Also present were the N-desmethyl and N-oxide metabolites, accounting for 2 to 4%. Trace levels of other metabolites were observed. Group mean renal clearances ranged from 4.1 to 5.6 ml/min, indicating extensive reabsorption from the glomerular filtrate. As a result, the terminal phase half-life and the dose-normalized area under the curve were substantially greater than those of other members of the class.

Difloxacin metabolism and pharmacokinetics in humans after single oral doses