Viagra is a product containing Sildenafil citrate as an active ingredient. Sildenafil is a class of medications called phosphodiesterase (PDE) inhibitors.
What Viagra is used for?
Viagra is used to treat erectile dysfunction, more commonly known as impotence, in men. This is when a man man cannot get, or keep , a hard erect penis suitable for [...] http://bit.ly/bm4aJl
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