How should this medicine be used? Problems getting or keeping an erection can also be a sign of an underlying health condition that needs treatment and a risk factor for heart disease. The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St. But don’t assume that you’re alone. What is erectile dysfunction?1. How it works Sildenafil may be used to treat erectile dysfunction (ED or impotence) in men (Viagra brand) or pulmonary arterial hypertension in both men and women (Revatio . 8 min read If you think you have erectile dysfunction, or ED, a good first step is to talk with your doctor. The treatment you need will depend on what’s causing it. What Tests Will a . Drug Images What is Viagra? Viagra is a brand-name prescription drug that’s approved to treat erectile dysfunction (ED). With ED, you’re unable to have or maintain an erection. .