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Zhewitra 10 mg belongs to the class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. These drugs work by blocking the action of the PDE5 enzyme, which is responsible for the breakdown of cyclic GMP (a substance that helps relax the blood vessels). By inhibiting PDE5, Vardenafil allows the relaxation of the blood vessels in the penis, leading to increased blood flow and the ability to achieve an erection during sexual activity.