Drugs which increase level of theophylline include:: (A) chloramphenicol, (B) Cimetidine, (C) Allopurinol, (D) All of the above
Answer is D. Drugs which inhibit theophylline metabolism and increase its plasma level are-erythromycin, ciprofloxacin, cimetidine, oral contraceptives,allopurinol, chloramphenicol- all enzyme inhibitors dose should be reduced to 2/3rds of the usual dose KD TRIPATHI Page No:227