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The quaternion viva voce PDE5 inhibitors commercially available in the U.S.
are sildenafil (Viagra, Pfizer), Levitra (Vardenafil and Staxyn, Bayer/GlaxoSmithKline), tadalafil (Cialis, Eli Lilly), and a more than lately approved drug,
avanafil (Stendra, Vivus). The enlargement of this social class has allowed for greater tractableness in prescribing founded on item-by-item reply. http://lm360.us/