I tried it. Right after cancer therapy, I needed it to get an erection. OMG! I didn't need an erection that badly! Fortunately, my ability to get it up has returned. But if I ever need it again, I will think long and hard about it before using it again.
Viagra works by causing the inner cells of the blood vessels (endothelium) to produce nitric oxide (NO). NO causes the muscle layer of the blood vessels to relax. This allows blood to flow into your cock and you sprout a woody.
However!...Viagra doesn't differentiate between the vessels in your cock and anywhere else in your body...like your nasal sinuses, for example.
We were fooling around before dinner, so I took it then. I popped a woody just fine. But my sinuses also slammed shut. So I had to try to give a bj holding my breath! Then eat dinner, taking a biteful while holding my breath, then breathing, then eating, then breathing. All in all, it was pretty miserable.
So in conclusion, did you know that cantaloupe contains polyphenols that enter the endothelium causing NO production and improved erections, but not to the level of industrial strength?