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    Viagra is the trade name for a drug called Sildenafil. Viagra is one of a class of drugs known as PDE-5 (Phosphodiesterase type 5) inhibitors. Viagra and the other PDE-5 inhibitors can help men with erectile dysfunction (male impotence) by enhancing the erectile response when a man is sexually stimulated. Aside from Viagra, the other drugs in this class are Cialis (Tadalafil) and Levitra (Vardenafil). Viagra does not cause a man to be sexually aroused. Viagra is only effective if you are sexually aroused. To understand how it works you need to understand the mechanics of how a man gets an erection. amoxicillin 3000 mg side effects Getting an erection involves your heart, blood vessels, hormones, nerves, and even your mood to be in harmony. But essentially erections mostly boil down to increasing blood flow to the penis and trapping that blood flow in special erectile tissues in the penis. Eventually, this trapped blood gets released, the erection ends, and blood flow returns to normal. Viagra works by interfering with the process that lets blood leave an erect penis. PDE5 is the enzyme that’s responsible for “turning off” erections. It works by relaxing muscles and veins in the penis enough to let blood flow return to normal. If an erection lasts more than a few hours it can damage the penis. (That’s why ED medication has a warning about erections “lasting longer than 4 hours”).

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    April 10, 2000 (Mill Valley, Calif.) -- In his early 40s, Ron Hanson was too young to be having trouble getting and sustaining erections. But like many men, he was too embarrassed at first to talk about the problem. Hanson (not his real name) waited seven years to see a urologist. By the time he spoke up, erectile dysfunction had become a household word, thanks to the popularity of the drug Viagra. But the widely touted drug, Hanson soon learned, doesn't work for everyone. When Viagra (sildenafil) hit the market in 1998, some men thought it was the long-awaited answer to their problems. According to the Grey Clinic in Indianapolis, which specializes in erectile dysfunction, 17% of men between 18 and 55 experience occasional impotence, while 6% have regular erectile difficulties. For men over 55, that number jumps to about one in three. The Texas Rangers slugger is only 37 and won't admit to having erection problems, yet he recently agreed to appear in ads promoting the drug. The deal has made people wonder whether Palmeiro really represents men with erectile dysfunction, or whether Pfizer, the company that makes Viagra, wants to persuade young men to try it for fun. Most Viagra users today, according to Pfizer, are in their early to mid 50s. It's true that erectile dysfunction is more common in older men, but many potential Viagra users are hardly senior citizens: About 40% of 40-year-old men in the U. So it makes sense that the company would want to reach more men around Palmeiro's age. Urologist Myron Murdock, medical director of the Impotence Institute of America, says these men are likely to use Viagra because sexual performance is a high priority for them. A younger man, Murdock says, "wants his V-12 Jaguar working just perfectly," whereas an elderly gent may be content with less dependable erections. What's more, the sexual partners of younger men "are more demanding of their performance," Murdock says. Pfizer denies that it's promoting Viagra for recreational use.

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