Zhewitra 40 mg is a medicine that contains vardenafil 40 mg, a phosphodiesterase type 5 (PDE5) inhibitor used for the treatment of erectile dysfunction (ED) in men. It works by improving blood flow to the penis, helping men achieve and maintain an erection during sexual stimulation. Vardenafil blocks the PDE5 enzyme, which helps maintain levels of cGMP, a chemical that relaxes smooth muscles in penile blood vessels. This allows increased blood flow to the penis when a man is sexually aroused.

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