title: Effect of lomefloxacin on theophylline pharmacokinetics.
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.
authors.affiliation: School of Pharmacy, State University of New York, Buffalo.
authors.forename: D E
authors.initials: DE
authors.lastname: Nix
authors.forename: A
authors.initials: A
authors.lastname: Norman
authors.forename: J J
authors.initials: JJ
authors.lastname: Schentag
mesh_terms: D042462:4-Quinolones; D000328:Adult; D000890:Anti-Infective Agents / Q000494:pharmacology*; D004347:Drug Interactions; D024841:Fluoroquinolones; D006207:Half-Life; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D015363:Quinolones; D013806:Theophylline / Q000493:pharmacokinetics*
chemical_list: D042462:4-Quinolones; D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D015363:Quinolones; D013806:Theophylline; C053091:lomefloxacin