Well, the thing about Viagra is that it was discovered, by...

Well, the thing about Viagra is that it was discovered, by accident, during a trial for some sort of heart drug - hey, I'm a layman so that's the best I can do.
However, I will say this, I hestitated because I'd read about some guys dropping dead after taking it, in the early days, but in the end I did take it. Unfortunately, though, I had to stop, on medical advice. Why, You ask? I kept blacking out.