<prompt> Which of the following Inhibits theophylline metabolism?INHGriseofulvinPrednisoloneCiprofloxacin  <response>: Plasma concentration of theophylline, warfarin is increased by enzyme inhibitors like ciprofloxacin also by norfloxacin and pefloxacin due to inhibition of metabolism: toxicity of these drugs can occur. ESSENTIALS OF MEDICAL PHARMACOLOGY 6TH EDITION KD TRIPATHI Page No:689 