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American Academy of Family Physicians - Using Viagra
Describes the drug, its application, the side effects and who should not take it.
MedlinePlus: Sildenafil
Features information about dosage, usage, warnings, and side effects.
Viagra
Pfizer's official site for this drug, with information for both patients and medical professionals.

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September 26, 2015 at 5:57:14 UTC
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