Sildenafil: Everything You Need to Know About This Powerful Medication Fast Facts: Sildenafil is the active ingredient in the blockbuster drug Viagra. It is used for treating erectile dysfunction (ED) and pulmonary arterial hypertension (PAH). Works by increasing blood flow to specific tissues in the body. What is Sildenafil? (Viagra, Revatio, and More) Sildenafil is...Read More