<prompt> Which of the following drugs when combined erythromycin may cause ventricular arrhythmias?TetracyclineStreptomycinEbastineCisapride  <response>: - Erythromycin causes inhibition of CYP3A4 enzyme. - As a result of this, level of Cisapride rises in blood - High blood levels of Cisapride causes QT prolongation and leads to Torsades-de-pointes ventricular arrythmia so, the combination is avoided. 