Sildenafil works for 90% of men
You're not alone. ED is a common problem for men, but most have seen real results from using erectile dysfunction treatments such as sildenafil. Sildenafil (or sildenafil citrate) is the name of the active ingredient in Viagra. Sildenafil is a PDE5 inhibitor, which relaxes your blood vessels and improves blood flow to your penis. This makes it easier to get and maintain an erection when you're aroused.
Dr. Phillip Ryan Whitman