Pharmacology Respiratory system 097984d9 Drugs which increase level of Theophylline include A Ciprofloxacin B Cimetidine C Allopurinol D All of the above High-Yield Explanation Refer KDT 6/e p 221 Drugs which inhibit Theophylline metabolism and increase it's plasma level are Erythromycin Ciprofloxacin Cimetidine OCP Allopurinol