A clinically significant interaction between ciprofloxacin and theophylline

Abstract
We report a case of theophylline toxicity following the co-administration of ciprofloxacin. Total theophylline clearance fell from 2.3 l·h−1 to 0.8 l·h−1 when ciprofloxacin was added to the treatment regimen and returned to 2.1 l·h−1 after ciprofloxacin was discontinued.