Viagra is the most famous of them. However, today scientists have developed and successfully use Cialis, Levitra
and other drugs of similar purpose. Not surprisingly, the question of where to buy these pills excites many men, as well as women. Viagra, Levitra and Cialis are based on the same principle. Under the influence of substances included in their composition, muscles of the corpora cavernosa of the penis are relaxed, which allows blood flowing to it.