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  • Title: The influence of the 4-quinolones ciprofloxacin, pefloxacin and ofloxacin on the elimination of theophylline.
    Author: Wijnands WJ, Vree TB, Baars AM, van Herwaarden CL.
    Journal: Pharm Weekbl Sci; 1987 Dec 11; 9 Suppl():S72-5. PubMed ID: 3481439.
    Abstract:
    Pharmacokinetic parameters of the bronchodilator theophylline were assessed in eight patients with chronic obstructive lung disease when administered alone and when comedicated with ciprofloxacin 500 mg twice daily, ofloxacin 400 mg twice daily, or pefloxacin 400 mg twice daily. Compared to the control period, in which only theophylline was administered, the total body clearance of theophylline decreased significantly during ciprofloxacin (30.4%) and pefloxacin (29.4%) coadministration, whereas no change of the renal clearance of theophylline occurred. Ofloxacin did not influence the pharmacokinetic parameters of theophylline. From these observations it is concluded that ciprofloxacin and pefloxacin reduce the metabolic clearance of theophylline.
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