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Sildenafil citrate, which is what Viagra is, is a drug that was created by Pfizer in the late 1990s. It helps men get and keep an erection when they are sexually aroused by improving blood flow to the penis. Because it works so well, Viagra quickly became a familiar name. It was also approved by top medical bodies like the US Food and Drug Administration (FDA). A lot of people choose this treatment first because they know it is safe and effective. . S( N; A% l) j% I
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