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  • Title: Effect of lomefloxacin on theophylline pharmacokinetics.
    Author: Nix DE, Norman A, Schentag JJ.
    Journal: Antimicrob Agents Chemother; 1989 Jul; 33(7):1006-8. PubMed ID: 2675751.
    Abstract:
    A study involving 25 health male volunteers was conducted to evaluate the effect of lomefloxacin on the pharmacokinetics of theophylline. The mean age was 22.4 +/- 3.0 years, and the mean weight was 77.3 +/- 7.7 kg. A single 6-mg/kg aminophylline dose was given intravenously on study days 1 and 15. The subjects received a 400-mg lomefloxacin dose (four 100-mg capsules) on study days 9 through 15. No treatment was given on study days 2 through 8. Thirteen blood samples were collected within 24 h after each aminophylline dose. Theophylline concentrations in serum were measured by enzyme immunoassay (EMIT). The mean aminophylline dose was 437 +/- 36 mg, equivalent to 344 mg of theophylline. Multiple doses of lomefloxacin had no effect on the area under the concentration-time curve from 0 h to infinity, maximal concentration, or clearance of theophylline from serum. There was a slight increase in the theophylline half-life from 6.72 +/- 1.63 to 7.02 +/- 1.37 h after lomefloxacin dosing (P = 0.04); however, the change was clinically insignificant. No change in theophylline dose is required when lomefloxacin therapy is instituted in a patient receiving theophylline.
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