The topic of our article is to acquaint you with the history of “Viagra” and to help you buy levitra. The discovery of sildenafil became the third greatest finding in medicine after the discovery of X-rays and penicillin. It was made under the term of “Viagra”. Persons that researched penicillin and X-rays were given a Nobel Prize. But the discoverers of sildenafil were also adjusted this prestige prize in autumn of 1998. The first researches began in 1992. It happened in the city that was called Sandwich, Kent, where “Pfizer” corporation had its lab. A new medical substance sildenafil citrate was under the study of the “Pfizer” chemists at that time. It supposed that a new drug would be a cure of various heart illnesses. The first goal of the new substance expected to be in increasing the blood pressure in myocardium by the way of releasing arterial blood pressure. The experiments showed unexpected consequences. There was too bad efficacy on cordial muscle and arterial blood pressure that it couldn't be use as this kind of medication. But in the same time scientists observed that male patients who took part in the experiments didn't want to return the medicine back. The cause of the denial was the same among all the tested people. Everyone was saying about the improvement of the erection quality. The cause was in the sildenafil influence. It wasn't definitely good in extending blood circulation within myocardium but it increased it in masculine reproductive organs. (more…)

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