Whether believe or not, Viagra is a mistake. In fact it was a mistake, better say an accident. Once upon a time, a rather embarrassing clinical research regarding a new treatment for angina has started. "We were looking for a drug that would dilate coronary arteries," the Pfizer scientists explained. "More blood, more oxygen, less angina—better lifestyle." Doctors and nurses were prepared to see reluctant people fighting to swallow the pills. Inspite of their black expectations, cheerfulness embraced all volunteers involved in this clinical study.
Why this high spirit was ?One by one the subjects of study confessed to medical stuff that after taking pills a wonderful thing had happened: suddenly, their sex life had dramatically improved. During clinical studies, one of the most important task assigned to doctors is to report any unexpected side effect, and reports regarding this unexpected kind of "side effects" kept pouring in. As many times before, when scientists looking for a certain thing discovered another thing, an outstanding medicine was born: Viagra, the best solution for men's erectile dysfunction (impotence). Originally developed to boost blood flow by relaxing and expanding coronary arteries, Viagra was found by ulterior studies to be effective in increasing blood flow to the male corpus cavernosa as well. Since its FDA approval in 1998, over 30 million scripts had been written in the US alone. This is a real proof that this drug allows men suffering by sexual dysfunction to perform normally within six hours after taking it.
As I said before Pfizer's scientists were looking for a drug to fight angina by dilating coronary arteries. During the studies they had found in the blood a substance, named cGMP, that caused arteries to dilate. At the same time, investing cGMP molecules, they discovered an enzyme, PDE5, that broke it down. Scientists observed that with PDE5 around, cGMP was destroyed and arteries shrank thin. By consequence a poor flow blood circulation was allowed. Viagra works as a PDE5 inhibitor. By its presence in humas body, the action of cGMP is stimulated causing relaxation in penis arteries. First the arteries in the penis expand allowing more blood to flow into the penis. Then the veins that usually carry blood out from the penis become compressed. Obviously, with more blood flowing in and less flowing out, the male genital enlarges, resulting in a strong erection.One more thing. Viagra will not increase sexual drive because it is not an aphrodysiac. No man will get an erection just by taking the pill. It works only when the man is sexualy aroused. Once the stimulation ends or the man completes sexual activity, the erection goes away. The conclusion is clear: Viagra is not a cure. You don’t have to take it everyday if you're not thinking on having sexual relations. Viagra is rapidly absorbed by the body. The maximum concentrations in the blood are reached within 30 to 120 minutes (generally 60 minutes) of oral administration on an empty stomach. When it is taken with a high fat meal, the rate of effectiveness is reduced, but individual results may vary. No alcohol is allowed. Many studies demonstrate that Viagra effects lasts up to 4 hours in human body while the man may perform one or more intercourses. As a conclusion, take Viagra with 60 minutes before expected sexual activity and be prepared to be in a good shape for about 4 hours. I think that you are ready now to start a new life together with this great pill.