Filitra 40 mg contains Vardenafil, a PDE5 inhibitor. PDE5 inhibitors work by blocking the enzyme phosphodiesterase type 5, which leads to increased levels of cyclic guanosine monophosphate (cGMP) in the blood vessels. Elevated cGMP levels result in smooth muscle relaxation and vasodilation, improving blood flow to specific areas, notably the penis. This mechanism is similar to other PDE5 inhibitors like Viagra (Sildenafil) and Cialis (Tadalafil), but with variations in potency and duration.

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