Lesser-known facts about Viagra as 'little blue pill' turns 20

Men and their lovers around the world are celebrating a different kind of anniversary on Tuesday.

Viagra, the "little blue pill," started combatting erectile dysfunction after the FDA approved its use 20 years ago today. And although its name and signature color have become instantly recognizable over the course of its lifetime, there are several lesser-known details about the drug that many are still unaware of. Here are five of its more scintillating facts.