<prompt> Theophylline metabolism interaction with ciprofloxacinIncreases theophylline metabolismDecreases theophylline metabolismIncreases ciproflexacin metabolismDecreases ciprofloxacin metabolism  <response>: Decreases theophylline metabolism 221-KDT 6th Ciprofloxacin and ofloxacin can Increases the serum levels of theophylline by inhibiting its metabolism Agents which induce theophylline metabolism decreases its plasma level Drug which inhibit theophylline metabolism and Increases its plasma levels Smoking Phenytoin RifampicinPhenobarbitoneCharcoalBroiled meat meal Erythromycin Ciprofloxacin CimetidineOralcontraceptiveAllopurinol Theophylline enhances the effects of - Furosemide, sympathomimetics, digitalis, oral anticoagulants, hypoglycemics Theophylline decreases the effects of - Phenytoin, lithium 