Sildenafil citrate 100 is also used to treat pulmonary arterial hypertension (PAH). PAH is a condition where there is high blood pressure in the arteries that carry blood from the heart to the lungs. Sildenafil citrate 100 helps to relax the blood vessels in the lungs, which reduces blood pressure and makes it easier for the heart to pump blood to the lungs. https://www.atlasobscura.com/u....sers/propharmacyshop