Nowadays erectile dysfunction problem is very actual in the whole world. More and more middle age men face to this problem each day.

The main causes of erectile dysfunction are psychological problems, self-actualization problem in the social and personal life. Vicious habits such as smoking, alcohol drinking also have a disastrous influence on men’s sexual health. In addition, there are some somatic problems such as damage of the spinal cord, cardiovascular diseases including atherosclerosis, diabetes that may lead to erectile dysfunction in men. According to the statistic nearly 50 % of men beginning from age 40 experience erectile dysfunction of a different degree.

Currently a lot of medication for erectile dysfunction are available on the pharmaceutical market. Viagra was the first approved medicine for Erectile dysfunction treatment. A bit later Cialis and Levitra were approved as well. In 2009 Viagra celebrated its 10th years anniversary of availability on the market. For this years Viagra has recommended itself as highly effective and well tolerated medicine Viagra acts by increasing blood inflow to the penis resulting in erection. The efficiency of erectile dysfunction is usually depend on the severity of men’s sexual problems. Viagra doe not increase libido and is not an stimulator. It simply blocks certain enzymes and contributes to the relaxation of the smooth muscles in the cavernous tissue, improving blood flow to the penis.

Clinical trials showed that Viagra is effective for men suffering from erectile dysfunction and which have vessels and nerves damage. Viagra is not effective in vascular erectile dysfunction and in venous drainage diseases. Efficiency of Viagra is based on local total blood volume increase into the cavernous body of the penis, which does not cause increase of sexual desire.

On pill of Viagra should be taken before an hour before the sexual intercourse. The effect of the medication lasts 4 hours. It is not recommended to use Viagra more than once a day.