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4.History of Viagra?
In the history of medicine has a lot of facts, when the emergence of miraculous discoveries were the result of random observations or findings. Two of the most striking examples to date - is the opening of X-rays and antibiotics.
In 1895 the German scientist Wilhelm Conrad Roentgen drew attention to the unusual green luminescence in the dark items that had just been some time in the vicinity of high-voltage cathode tube worked. He also drew attention to what is happening zasvechivanie packaged photographic film, which was also close to high-voltage tube worked. These unexpected observations enabled physics genius to suggest there is radiation, which has not previously been known to mankind. Later, as we know, so bold was fully confirmed.
The history of antibiotics is the opening sequence even more amazing coincidence. In 1928, British explorer Alexander Fleming accidentally discovered that a dirty mould destroyed almost all types of bacteria, which he grew for bacteriological experiments. However, rather than expose laboratory utensils for growing bacteria sterilization experiments and start anew, Fleming carefully studied the properties of dirty mould, which we now known as Penicillin. So antibiotics were discovered who committed revolution in medicine.
Invention of Viagra has become, apparently, the third greatest "accidental" discoveries in medicine. This is evidenced by the fact that all of the kind mentioned above, were awarded the Nobel Prize. The same high awards in autumn 1998 was awarded to researchers who find, among other things, the properties of the drug Viagra.
The history of Viagra started in 1992 in Britain, in place Pfayzers sandwich in the course of pharmacological research firm Pfizer. Researchers conducting clinical trials of a new drug substance - Sildenafil citrate , which was developed as a means to treat a number of cardiac ailments. Scientists had hoped that the sildenafil citrate will boost blood to the heart muscle and reduce blood pressure. However, it was noted that sildenafil citrate not have a significant impact on either the blood circulation in heart muscle (myocardium), or on blood pressure. Parallel found that many male patients who participated in the study, refused to return the pills sildenafila, despite the end of the test. The reason for the denial of all these patients had one - they all pointed at the sharp improvement in the quality erektsy. Thus, despite the minimal impact of new drugs on blood circulation in the myocardium, sildenafil caused appreciable inflow of blood to male genitalia.
Researchers Pfizer pharmaceutical company refer to this unexpected properties of sodium sildenafila with due care and were able to recognize in it a powerful tool in the fight against violations erektsy. The new drug was named Viagra - the name was born as a result of a merger would be the words Vigor (power, energy, strength), and Niagara - the most powerful waterfall in North America.
Since 1993, began lengthy clinical trials necessary to demonstrate the properties of Viagra . As a result of these tests has been demonstrated high efficiency Viagra to treat impotence and high safety of the drug. I rather finale - March 27, 1998 the United States Department of Food and Drug approved the use of Viagra.
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