The history of viagra
Viagra, perhaps, is the most famous, popular, and promoted product for the treatment of the erectile dysfunction. This is a pill containing citrate of sildenafil. One of the benefits of treatment ed using viagra is that no need of injections into the penis or other medical procedures, you should just eat the pill before sexual intercourse. 
The essence of the drug is extremely simple and at the same time very effective: viagra can increase the amount of blood that flows into the penis – that’s how viagra helps man to create a natural erection, and that is “simple” and “natural” processes that are the main innovation and product’s advantages as against ed proucys of competitors.
The history of viagra takes start in 1992 in the nice small city of United Kingdom – Sandwich city. During the pharmaceutical research of the new drug substance – “sildenafil citrate” – by the company “Pfizer”, the new drug’s unusual properties were identified. Initially, the drug was developed for treatment of some kinds of heart ailments. Viagra – Sildenafil fistly was to help to increase blood flow to the heart muscle and reduce the blood pressure. But, it was found, that sildenafil citrate doesn’t have significant effect neither on blood circulation in the heart muscle, nor on the blood pressure. At the same time it was found that a lot of patients of male sex, who participated in the experiments, refused to return the sildenafil pills, despite of the end of experiments. And there was one main reason of rejection – all of them pointed the high improvement of erection! Thereby, despite of the minimal impact of new medicament on blood circulation in myocardium, sildenafil caused significant blood flow into genitals of the men. The opening of the Viagra pill became the third greatest accidental discovery in the medicine – after the discovery of X-rays and penicillin. These discoveries were awarded with a Nobel Prize. The same high award was given to researchers who discovered, among other things, the properties of the viagra pill in autumn of 1998. Since 1993 the extensive clinical trials were organizated, that was necessary to demonstrate and approve the magic properties of viagra. As the result of these tests the high effectiveness of viagra for treating of male impotence and high safety of this drug were confirmed. On 27 march, 1998 U.S. Department of Food and Drug approved using of viagra. The action of the drug was evaluated in more than 3000 men aged from 19 to 87 years old in experiments connected with treating of erectile dysfunction, held all over the world. The time of suffering from erectile disorders of tested patients was ranged from 6 months to 26 years, and the disorders of erection had organic, psychogenic and mixed organic and psychogenic nature. The results of these tests showed that viagra is effective for the restoration of erectile function and improvement of the performance of successful sexual intercourses for a large number of patients, including a range of diabetic patients with spinal cord injury and other associated clinical conditions, as well as in patients receiving a lot of medicines simultaneously.
So, viagra pill is the most effective way to treat erectile dysfunction nowtimes, nevertheless the existence of other ed medicaments for ed treating: cialis and levitra for example, which are the main competitors of viagra. After huge numbers of tests and experiments, a lot of stories of happy people treated ed – i think the reputation of viagra speaks for itself. All you need to do is to take one pill of viagra about an hour before sexual activity. After about 30-60 minutes the effect of viagra starts and lasts for four – six hours. It’s the best way to take viagra before eating, as in this case it will act faster. The action of viagra have such feature that you need to take it only when you want to perform sexual intercourse. Viagra should not be taken more than once a day especially if you refer to the people suffered from illness of cardio-vascular system: congestive heart failure, cerebrovascular accident (heart pain, impaired memory and mental abilities) – you should be very careful if have mentioned diseases and you should know that there are already several cases of death using viagra registered. You should consult with your doctor about the advisability of using viagra.
