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Vigora 50 mg is part of a class of medications known as PDE5 inhibitors. PDE5 inhibitors work by blocking the action of an enzyme called phosphodiesterase type 5 (PDE5), which is responsible for constricting blood vessels in the penis. When this enzyme is inhibited, the blood vessels relax, allowing more blood to flow into the erectile tissue. This increased blood flow helps to achieve and maintain an erection when sexually aroused.