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Zhewitra 40 mg is a medication used to treat erectile dysfunction (ED) in men. It contains vardenafil as its active ingredient, which belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. Vardenafil works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which regulates blood flow in the penis. By blocking PDE5, vardenafil helps increase blood flow to the penis during sexual stimulation, leading to the formation and maintenance of an erection.