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Viagra is a drug for older men that have a hard time getting erectile dysfunction to go away. Viagra is a single pill that produces an erection and because of its simplicity, it has had wild commercial success. Viagra was marketed by Bob Dole with some controversy because of the nature, timing, and display of the ad. There are several dangers inherent in using and abusing Viagra. More than 23 million have current prescriptions for Viagra. Viagra faces some stiff competition from Cialis which gives a longer erection duration. Pun intended with the word, stiff, there. buy cialis online

The technical name for Viagra is Sildenafil. It is sold as Sildenafil citrate and Revatio. It is a drug that is used to treat erectile dysfunction and pulmonary arterial hypertension. It was sold by the pharmaceutical company, Pfizer. It has 40% bioavailability as a general rule, hepatic metabolism, a half life of 3 to 4 hours, fecal excretion of around 80%, renal excretion of 13%, a legal status of prescription only, and an oral route to dosing. The Food and Drug Administration approved it in 1998 for the treatment of erectile dysfunction. Peter Dunn and Albert Dunn were said to be the inventors of the drug, but that is something that Pfizer would dispute.

The mechanism of action is very simple, and Levitra and Cialis copy it because it is a PDE5 inhibitor in the corpos cavernosum of the penis which affects the nitric oxide and receptors for that enzyme in the penis. It has several other uses like for sexual dysfunction, pulmonary hypertension, altitude sickness, use in sports, and other uses which are not so apparent, but people and doctors are discovering all the time. Professional sports players sometimes use it to open their blood vessels and enhance their performance, but it is hard to do much athletic work with an erection. generic cialis