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Zhewitra 20 mg is a medication used to treat erectile dysfunction (ED) in men. It contains vardenafil, a potent phosphodiesterase type 5 (PDE5) inhibitor that works by increasing blood flow to the penis during sexual stimulation, helping men achieve and maintain a firm erection. Vardenafil enhances the effects of nitric oxide, a natural chemical the body produces during arousal. This relaxation of smooth muscle and increased blood flow leads to improved erectile response. Sexual stimulation is required for the medication to be effective.