Sildenafil er en svag hæmmer af cytokrom P450- isoformer 1A2, 2C9, 2C19, 2D6, 2E1 og 3A4 (IC50 > 150 µM).
Sildenafil is a weak inhibitor of the cytochrome P450 isoforms 1A2, 2C9, 2C19, 2D6, 2E1 and 3A4 (IC50 > 150 µM).