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Tadalafil, the active ingredient in Vidalista 40 mg, works by inhibiting the enzyme PDE5. Normally, PDE5 breaks down cGMP, a chemical that helps relax the smooth muscles in the penis, which allows blood vessels to dilate. By blocking PDE5, tadalafil increases the levels of cGMP, enhancing blood flow to the penis and helping men with ED achieve an erection when sexually aroused.
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