Will Viagra work the first time I take it?

Viagra may work well the first time you take it. About 80 percent of men who take Viagra for erectile dysfunction show improvement as soon as they begin using the drug, according to the American Urological Association Foundation.

Of the small percentage of men who don't respond immediately to Viagra, about 40 percent respond when they receive proper instruction on the correct way to use the medication. If Viagra doesn't work for you the first time, talk to you doctor to make sure that you are taking the medication correctly.