Viagra is produced in 25, 50, and 100 mg tablets, which contain, respectively, 25, 59, and 100 mg of sildenafil citrate.
As opposed to other ways of erectile dysfunction treatment which consist in injections into the penis or other medical procedures, Viagra is a simple and easy-to-use preparation. When using Viagra, you just take one pill before having coitus.
The mechanism of Viagra effect is simple: the preparation increases the quantity of blood arriving to the penis. This helps a man to cause natural erection. Viagra has its effect only in thy case when a man is feeling natural sexual arousal, and when the coitus ends, the penis naturally relaxes. In other words, Viagra affects only natural mechanisms of erection and in this there’s its undeniable up-to-dateness and the secret of great popularity.
The discovery of Viagra became the third greatest “accidental” opening in medicine – after the opening of X-rays and penicillin. These discoveries were awarded Nobel Prize. This high award was also given in 1998 to the research people who discovered, in addition, the characteristics of Viagra.
The history of Viagra started in 1992 in Great Britain in the township Pfizer Sandwich in the course of pharmacology research work of Pfizer Corporation. The research people were probing the new pharmaceutical substance – Sildenafil Citrate – which was developed as the remedy for medication of some heart diseases.
The scientists expected that sildenafil citrate will promote increasing blood inflow to the cardiac muscle and lowering blood pressure. But it was noted that sildenafil citrate doesn’t influence much neither blood circulation in cardiac muscle (myocardium) nor blood pressure. At the same time it was found out that many patients of male sex taking part in the testing refused to return sildenafil pills, despite of the ending of the experiment. The reason was one among all the patients – they all noted erection recovery. Thus, in spite of the minimum influence of the new medicine on the blood circulation in myocardium, sildenafil caused perceptible blood inflow to male genital organs.
The research people of the pharmaceutical Pfizer Corporation took this unexpected quality quite seriously and managed to recognize powerful preparation for erection dysfunction combat. The new preparation was named Viagra – the name appeared as the result of junction of the words “Vigor” (power, energy, force) and Niagara – the most massive waterfall in North America.
Since 1993 prolonged clinical trials necessary for proving Viagra characteristics started. As the result of these trials high effectiveness of Viagra and its safety were proved. And after all on the 27th March, 1998 the USA Medical Supply Department approved the use of Viagra. The effect of the preparation was estimated among more than 3000 men from 19 to 87 of age during the research work of erectile dysfunctions held in all the countries of the world. The average duration of dysfunction was about 5 years (from 6 months to 26 years), while the nature of this malfunction was of organic, psychogenic, and combined psychogenic-organic origin.
The results of these research work show that Viagra is effective for erectile function recovery and for the improvement of successful coitus rates among a great number of the patients including those having diabetes, spinal cord injuries, and other concomitant clinical states, as well as among the patients taking a whole number of medicaments.
According to numerous clinical trials and testing the preparation on volunteers suffering from different types of erectile dysfunction, sildenafil citrate is quite effective. But some nuances should be noted.
Unfortunately, there exists no preparation able to treat all the diseases, in this case all the types of erectile dysfunction. Viagra isn’t a panacea either; it can help in the majority of cases, but not all the patients. Viagra is effective among the patients suffering from atherosclerosis, the injury of nerves of penis vessels, or diabetes.
Moderate results are observed among the patients with pathological venous drainage. In each of the enumerated cases only a doctor can organize erectile dysfunction treatment in the right way. He can prescribe the necessary treatment regimen and choose the best medicine.
