Their probably isn't a man on the planet that doesn't know what Viagra is. The anti-impotence drug Viagra, produced by the U.S. pharmaceutical giant Pfizer, first became available in 1998 and since then has helped more than 16 million men around the world, who suffer from varying degrees of Erectile Dysfunction (ED) or impotence, to enjoy a healthy and satisfying sex life. As the arteries in the Penis expand and harden, the veins that normally carry blood away from the area become compressed, restricting the blood flow out of the shaft. If you can identify the cause, this condition can be successfully treated, so allowing normal sexual function to return of its own accord. With more blood flowing in and less flowing out, the Penis enlarges, resulting in an erection. Most men will have a problem getting an erection at some time in their lives. Very often it's another medical condition, possibly one you don't even know you have, that is causing ED. Such is the popularity and apparent efficacy of the drug that 9 tablets are dispensed every second worldwide and over 600,000 doctors recommend Viagra for the treatment of ED. However, certain physical or psychological factors can interfere with this natural process

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