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Nitric oxide plays a crucial role in the action of Vidalista Professional, which contains the active ingredient Tadalafil. Nitric oxide is naturally produced in the body and acts as a signaling molecule, causing relaxation of smooth muscles in blood vessel walls, including those in the penis. When a person takes Vidalista Professional, Tadalafil inhibits the action of an enzyme called phosphodiesterase type 5 (PDE5). This inhibition leads to increased levels of nitric oxide in the blood vessels of the penis, enhancing its effects. As a result, there is increased blood flow into the penis, leading to an erection. In summary, nitric oxide helps to initiate and maintain an erection by relaxing the smooth muscles in the blood vessel walls, and medications like Vidalista Professional enhance its effects by preventing the breakdown of cyclic guanosine monophosphate (cGMP), a compound that is essential for vasodilation and erectile function.