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Viagra is a drug that can cause erections in men with ED, erectile dysfunction. It is given for the problems associated with age impairment of erectile function that usually accompanies all men in their 50s and 60s. This drug is not indicated for people with heart conditions or with several conditions that accompany old age and may interact negatively with the drug and cause a host of heart problems like heart failure. Several problems can occur if people take nitrates for chest pain along with Viagra because the two just don’t mix and can cause a host of problems that the person may be unprepared for, like heart failure.
Viagra is excreted through fecal excretion of around 80% and renal excretion of around 13%. It has a 40% bioavailability with hepatic metabolism, and it is available by prescription only, and it is taken through oral routes. It was advertised directly to consumers on television in a bit of stirring controversy with Bob Dole even though it was a prescription drug. At one time, in the year 2000, Viagra had 92% of the market in erectile dysfunction medication. In England, men between the ages of 30 and 65 would be able to buy Viagra and take it over the counter after a consulation with a pharmacist without a prescription. This drug works by protecting the cyclic guanosine monophosphate from degradation by cGMP specific phosphodiesterase type 5. buy cialis
Viagra pills can be distinguished because of their diamond shape, blue color, and the words Pfizer engraved on one side and VGR xx engraved on the other with either 25, 50, or 100 in the place of the xx. There are several contraindications for men who should not take Viagra, and these include severe hepatic impairment, severe impairment in renal function, hypotension and low blood pressure, recent stroke or heart attack, or hereditary degenerative retinal disorders like genetic disorders such as retinal phosphodiesterases.