<prompt> Patient is on Cisapride for gastroesophageal reflux develops upper respiratory tract infection, and physician prescribes erythromycin. What pharmalogical interaction would be expected -Dereased level of erythromycin and exacerbation of UIDecreased effect of cisapride due to enzyme inductor of erythromycinFatal ventricular arrhythmiaHemorrhagic cystitis  <response>: Ans. is c i.e., Fatal ventricular arrythmia 