Drugs which increase level of Theophylline include: (A) Ciprofloxacin, (B) Cimetidine, (C) Allopurinol, (D) All of the above
Answer is D. Refer KDT 6/e p 221 Drugs which inhibit Theophylline metabolism and increase it's plasma level are Erythromycin Ciprofloxacin Cimetidine OCP Allopurinol