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Zhewitra 20 mg is a medicine that contains vardenafil 20 mg, a phosphodiesterase type 5 (PDE5) inhibitor used for the treatment of erectile dysfunction (ED) in men. It helps improve blood flow to the penis, supporting the ability to achieve and maintain an erection during sexual stimulation. Vardenafil blocks the PDE5 enzyme, which helps increase levels of cGMP, a chemical that relaxes smooth muscles in penile blood vessels. This allows more blood flow to the penis when a man is sexually aroused. Zhewitra 20 mg does not increase sexual desire and will not cause an erection without sexual stimulation.