Sildenafil, commonly known as Viagra, is a medication used to address erectile dysfunction in men, which is the inability to achieve or maintain an erection during sexual activity. Additionally, a different form of sildenafil called Revatio is used to enhance exercise capacity in adults suffering from pulmonary arterial hypertension (PAH), a condition characterized by high blood pressure in the lung’s blood vessels, resulting in symptoms like shortness of breath, dizziness, and fatigue.