Sildenafil is used to treat a rare condition called pulmonary arterial hypertension. With pulmonary hypertension, sildenafil works by causing the arterial walls to relax, leading to reduced pressure. It thus eases the strain put on the right ventricle of the heart allowing it to function better. Sildenafil acts in such a way that it only targets the walls of the arteries and the penis, preventing vasodilation in other areas.
Sildenafil is a medication used to treat high blood pressure in the lungs (pulmonary hypertension). Sildenafil is in a class of medicines known as phosphodiesterase (PDE) inhibitors.
Sildenafil treats pulmonary hypertension by relaxing blood vessels in the lungs, an action that allows blood to flow easily.