system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following does not affect the metabolism of Theophylline?
assistant
The correct answer is  Steroids does not affect metabolism of theophylline. Smoking is found to increase clearence of theophylline. Drugs increasing the clearence of theophylline are rifampicin, phenobarbitone and ethanol. Drugs inhibiting the clearence are cimetidine, erythromycin, ciprofloxacin, allopurinol and zileuton.