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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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PDF) Practice patterns in sildenafil prescribing

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Viagra users are 25% less likely to suffer early death

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PDF) Comparison of the efficacy and safety of sildenafil citrate (Viagra®) and oral phentolamine for the treatment of erectile dysfunction

Men who use Viagra are 25% less likely to suffer early death: USC study

Effect of sildenafil added to antifibrotic treatment in idiopathic pulmonary fibrosis

Men who use Viagra are 25% less likely to suffer early death: USC study

Pharmacokinetic profile of sildenafil citrate in healthy Middle Eastern Males: Comparison with other ethnicities - ScienceDirect

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Sildenafil, a phosphodiesterase-5 inhibitor, stimulates angiogenesis and bone regeneration in an atrophic non-union model in mice, Journal of Translational Medicine

Efficacy and dermal toxicity analysis of Sildenafil citrate based topical hydrogel formulation against traumatic wounds - ScienceDirect