How Viagra affects on vision?

[dropcap]V[/dropcap]iagra – is one of the most well-known drugs that help men recover potency and return to normal sexual life. However, despite the popularity of the drug, won over the years of successful sales, many men are afraid to buy Viagra online and take it because of some side effects.

One of the negative actions of Viagra, found at the stage of clinical trials was the change in the perception of blue and green. Color vision disorder appears when sildenafil is completely absorbed by the body, and disappears after a few hours by itself.

Additional studies have shown that sildenafil blocks the enzyme phosphodiesterase is temporarily not only in the vessels of the penis, but also in blood vessels of the retina. This fact interested scientists from Indianapolis, who conducted tests using Viagra and another drug to correct erectile dysfunction called Cialis. Participants of the experiment were divided into three groups. The first group received 5 mg Cialis and the second group received 50 mg of Viagra, and, finally, the third group received a placebo. The tests had been lasting for six months. As a result, 80% of participants had no problems with vision.

Thus, studies have shown that Viagra can be safe for health. Buying Viagra online, you can be sure that the side effects of sildenafil rarely show themselves and their effects on the body is short, you need only wait a couple of hours.