Samtidig indgift af HIV- proteasehæmmeren indinavir (800 mg 3 gange daglig), en potent CYP3A4 - inhibitor, og vardenafil (10 mg) medførte en 16 dobbelt stigning af vardenafil AUC og en 7 dobbelt øgning af vardenafil Cmax.
Co-administration of the HIV protease inhibitor indinavir (800 mg three times a day), a potent CYP3A4 inhibitor, with vardenafil (10 mg) resulted in a 16-fold increase in vardenafil AUC and a 7-fold increase in vardenafil Cmax.