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Zhewitra 40 mg contains Vardenafil, a medication used to treat erectile dysfunction (ED) in men. It belongs to the class of PDE5 inhibitors, which work by improving blood flow to the pill, helping men achieve and maintain an erection during physical activity. During physical arousal, the body releases nitric oxide (NO) in the penile tissue. NO activates cGMP (cyclic guanosine monophosphate), which relaxes smooth muscles in the blood vessels of the pill. This relaxation allows more blood to flow into the erectile tissue, causing an erection. Normally, the enzyme PDE5 breaks down cGMP, ending the erection.

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