<prompt> Ciprofloxacin should not be given to an asthmatic using theophylline because:Ciprofloxacin inhibits theophylline metabolismTheophylline inhibits ciprofloxacin metabolismCiprofloxacin decreases effect of theophyllineTheophylline induces metabolism of ciprofloxacin  <response>: Ans. A Ciprofloxacin inhibits theophylline metabolismRef: KDT 8e p761Theophylline has a narrow margin of safety low therapeutic index Ciprofloxacin inhibits theophylline metabolism and increases its plasma level leading to toxicity. Thus, ciprofloxacin should not be given to an asthmatic using theophylline. 