The questions of interchangeability of medial products are the most difficult ones on the medication market today. We may say that there are no good relations between the original and copied preparation producers. And lots of cheap drugs can be bought on the web. Of course, we may understand the feelings of medications' researchers. Tremendous means that are spent on the investigations of the preparation's molecule. The investigations of the remedy that are done to distribute it in future on the market. (more…)

The topic of our article is to inform you with the history of “Viagra” and to assist you buy levitra. The discovery of sildenafil has become the third greatest finding in medicine after the finding of X-rays and penicillin. It was made under the name of “Viagra”. A Nobel Prize was given for the researches of penicillin and X-rays. This prestige award was given to chemists that founded “Viagra” in autumn of 1998. The history of sildenafil has started in 1992 in Pfizer's Sandwich, where “Pfizer” company had its tests. Sildenafil citrate was a fresh medical substance and the chemists conducted tests with it. It conjectured that a new remedy would be a cure of different heart diseases. Firstly everybody wanted to use it for increasing blood pressure in myocardium releasing arterial blood pressure in the same moment. The researches presented unforeseen consequences. There was too bad efficacy on myocardial and arterial pressure that it couldn't be applied as this type of medication. And it was remarked that masculine patients that took part in the research denied returning the tablets in spite of the test finishing. All the tested people had the similar motive for saving the medicine with them. Everyone was speaking about the improvement of their erection grade. It was the consequence of sildenafil influence that wasn't helpful for blood circulation in the heart but extended it in the male reproductive organs. (more…)

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