Abstract
The effect of multiple doses of lomefloxacin (400 mg twice a day) on the clearance of theophylline and the urinary excretion of its metabolites was investigated in 15 healthy male subjects. Concentrations of theophylline in plasma were measured by TDx (Abbott Diagnostics, Mississauga, Ontario, Canada). Urinary excretion of theophylline and its three major metabolites and lomefloxacin in plasma were assayed by high-performance liquid chromatography. Total theophylline clearance remained unchanged before lomefloxacin treatment and after lomefloxacin single- and multiple-dose treatments (58.02, 56.57, 54.07 ml/min, respectively). The urinary recovery of unchanged theophylline and its major metabolites stayed stable during the study. We conclude that lomefloxacin can be added to the list of fluoroquinolones that can be administered safely with theophylline.
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