Viagra (Sildenafil): Uses, Benefits and Side Effects Whether you’re a senior in high school or a senior-living resident, you’ve likely heard of Viagra (sildenafil) — the original medication for ED.

Viagra inhibits PDE5 and acts as a vasodilator (something that dilates blood vessels and increases blood flow). A single tablet of sildenafil can do that — typically, one dose is all that’s required ...