What is the ViagraThe medicine Viagra is the first pharmaceutical medicament which shows significant and authentic efficiency at the majority of patients with dysfunctional erection. Viagra promotes the natural response of an organism to sexual stimulation.How does Viagra workIt consists in increase in quantity of the blood acting in a penis that helps the man to cause natural erection. The indisputable novelty and a secret of huge popularity is that Viagra operates only on natural mechanisms of erection occurrence.What is efficiency of ViagraViagra possesses enough high efficiency. To a considerable degree the efficiency of Viagra depends on kind of erectile dysfunctions, on concomitant disease. Viagra is effective enough at vascular erectile dysfunctions, but at presence of a pathological venous drainage the results of Viagra usage are much worse.Whether Viagra raises a sexual desireAction of Viagra is based only on local increase of a blood-groove in cavernous eStatus: 20 ;