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Zudena 100 mg tablet is a medication used to treat erectile dysfunction (ED) in men. Udenafil works by increasing blood flow to the penis during sexual arousal, helping men achieve and maintain an erection. The medication usually takes about 30 to 60 minutes to take effect and can last for 5 to 6 hours, allowing a sufficient window for sexual activity. Take 1 tablet about 30 to 60 minutes before planned sexual activity. Do not take more than one dose per day. It helps increase blood flow to the penis, leading to a better erectile response when sexually stimulated.