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Male impotence can be caused by a variety of factors. A common reason, particularly among older men, is male impotence caused by reduced blood flow to the penis. As a PDE5 inhibitor, Viagra relaxes the muscles in the penis, allowing the vessels to dilate and fill with blood. The result is improved blood flow that facilitates an erection once you become sexually aroused. Viagra has been shown to work well for most men, regardless of age, even if you have had male impotence for several years. levitra voucher In those patients who are stable on alpha-blocker therapy, PDE5 inhibitors should be initiated at the lowest recommended dose.Viagra does not cure erectile dysfunction and it does not protect you or your partner from acquiring any sexually transmitted diseases. lack or loss of strength

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Not particularly impressed by the clinical usefulness of Cialis for daily use, Utz readily admits that the marketing campaign has been a success. "I mean I had five or six people today ask me about this," Utz lamented. "I'm just to the point of nausea on this direct-to-consumer advertising."Guanylate Cyclase (GC) Stimulators

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Levitra - Clinical PharmacologyPfizer won’t say how much money they lose on fake Viagra, but the drug is one of the company’s blockbusters, pulling in more than $2 billion in 2012. Viagra isn’t Pfizer’s only counterfeit headache: in 2008, according to John Clark, vice president of global security for the company, about 20 different Pfizer medicines and products were being counterfeited around the world. Today, that number is up to 60—everything from Lipitor and Centrum Vitamins to, bizarrely, ChapStick.