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Viagra is one - probably the best known - of a group of medications that are used to treat Erectile Dysfunction.

What is Viagra?

Pharmacologically called Sildenafil, it belongs to a group known as Phosphodiesterase Five inhibitors (PDE5-Inhibitors) that act in the human body by inhibiting an enzyme called PhosphoDiesterase 5. Inhibition of the action of PDE5 causes the arteries carrying blood to the sexual organs to dilate and so allows satisfactory blood flow to the penis - blood flow adequate to engorge the penis and result in it becoming erect.

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