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Zhewitra 20 mg contains vardenafil, which is a medication primarily used to treat erectile dysfunction (ED) in men. Vardenafil belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors, similar to sildenafil (Viagra) and tadalafil (Cialis). These medications work by increasing blood flow to the penis during sexual stimulation, helping men to achieve and maintain an erection. Zhewitra 20 mg is effective in treating ED by improving blood flow to the penis, which enables men to achieve and sustain an erection sufficient for sexual activity. The typical starting dose of Zhewitra is 10 mg, taken orally about 25 to 60 minutes before sexual activity. However, the dosage may be adjusted based on individual response and tolerability. The maximum recommended dose is 20 mg once daily.