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Research shows that typical generic sildenafil products from the internet contain impurity levels higher than allowed in the U.S. In addition, the generic products are made to be similar in appearance to those from legitimate drug manufacturers.

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Pharmacokinetics of a Novel Sildenafil Orodispersible Film Administered by the Supralingual and the Sublingual Route to Healthy Men

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PDF) The ENDOTRIAL Study: A Spontaneous, Open-Label, Randomized, Multicenter, Crossover Study on the Efficacy of Sildenafil, Tadalafil, and Vardenafil in the Treatment of Erectile Dysfunction

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Which is better, Viagra, Cialis or Levitra for better and longer performance? - Quora