History «Viagra» started in 1992 in Britain, in the city Pfayzers Sandwich, in the course of pharmacological research firm «Pfizer». The scientists conducted clinical trials of a new drug, which was developed as a means to treat heart ailments.

Scientists had hoped that the drug would increase the inflow of blood to the heart muscle and snizhenat arterial pressure. Unfortunately, it was noted that the drug does not cause the expected symptoms. Significant impact on blood circulation in the heart muscle or on blood pressure were observed. This revealed that many patients are male, participated in the study refused to return the pill Viagra, despite the end of testing. The reason for rejection of all these patients, as it turned out there was one - every man pointed at the sharp improvement in the quality of erection. Thus, it appears that sildenafil caused a very significant inflow of blood to the male genitalia.

Researchers pharmaceutical company «Pfizer» zaiteresovalis this effect and speculated that the drugs that we now know as Viagra will help deal with Erectile Dysfunction. The name Viagra was born as a result of merging the words "Vigor" (power, energy, force) and the Niagara - the most powerful waterfall in North America.

In 1993, began clinical trials, which were to confirm the properties of «Viagra». As a result of these tests has proved highly effective «Viagra» for the treatment of impotence and the absolute safety of this drug. 27 March 1998, the U.S. Department of food and medicine has allowed the use of «Viagra», that day can be rightly regarded as the birth of Viagra.