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How Viagra Works Viagra (Sildenafil) is an oral drug for male impotence (ED). Having been around for a lot longer, Viagra has a great safety track record and proven effects that start acting in 30 minutes and last for about 5 hours. However, it is not a hormone or an aphrodisiac. Viagra, or Sildenafil Citrate, is considered by many as being a wonder drug. Via…