Samtidig indgift af erythromycin (500 mg 3 gange dagligt), en CYP3A4- inhibitor, og vardenafil (5 mg) medførte en 4 dobbelt øgning af vardenafil AUC og en 3 dobbelt øgning af Cmax.
Co-administration of erythromycin (500 mg three times a day), a CYP3A4 inhibitor, with vardenafil (5 mg) resulted in a 4-fold increase in vardenafil AUC and a 3-fold increase in Cmax.