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.

Have you taken brand name Cialis or Viagra and felt like you had a hangover? That “Viagra hangover” might actually be a headache from Viagra, and it’s a common side effect of this and other ...