Active Ingredient: SILDENAFIL CITRATE Strength: 100MG 150MG, 200MG Packing: 10 Tablets in 1 box Sildenafil is a medication used to treat erectile dysfunction (ED) and pulmonary arterial hypertension (PAH). It works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which increases blood flow by relaxing the smooth muscle in blood vessels. For ED, it helps increase blood flow to the penis during sexual stimulation. For PAH, it lowers blood pressure in the lungs to improve exercise capacity.