How does Viagra help with ED?
In order to gauge how Viagra works, we must understand how blood flows into the penis. There are arteries that carry blood into the penis. Spongy tissue inside the penis can fill with blood upon sexual arousal. This process allows the penis to harden and become erect. For men who have ED, the blood flow does not move as well as it should.
What exactly does Viagra do for men?
The main problem in ED is getting the right amount of blood flowing into the arteries of the penis. Viagra increases blood flow to the penis. It works by blocking the enzyme phosphodiesterase. Inhibition of this enzyme, coupled with sexual stimulation, maintains blood flow into the penis and allows for an erection to be sustained. The main results: the penis stays harder longer. Viagra can work up to 4 hours! Furthermore, Viagra only works when necessary, usually during sexual intercourse. The erection will go away after.
