Viagra is the pharmaceutical drug number one for the men who suffer from problems with erection and loss of sexual power. It is a very effective healthcare product making it possible for the body to respond naturally to the sexual stimulation. It increases the quantity of blood going to the penis, what helps to cause the natural erection. Viagra influences only the natural mechanisms of erection, that's why the blue pill viagra is so popular in our days. The effectiveness of this pharmaceutical drug depends generally of the type of erectile dysfunction as well as of the number and kind of associated diseases in man's body. This healthcare product is as a rule prescribed to the men having the erectile dysfunctions of different types, including the cases of penis vessel diseases or penis nerve disorders. It doesn't make stronger the sexual desire and doesn't increase libido. Its effect is based only on the local blood flow rise in penis. Before you start your treatment with Viagra make sure to consult your sexual pathologist or urologist, and also your physician or cardiologist to eliminate the possibility of any heart disease. This healthcare product is available at lots of viagra pharmacy sites. But buying viagra online, make sure you buy at Viagra pharmacy which is officially registered and is licensed to carry on pharmaceutical trade.