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Vilitra is a medication used to treat erectile dysfunction (ED) in men. Its active ingredient is Vardenafil, which belongs to the class of phosphodiesterase type 5 (PDE5) inhibitors. Vardenafil works by relaxing the blood vessels in the penis, increasing blood flow during sexual arousal, which helps achieve and maintain an erection. Common side effects include headache, dizziness, flushing, nasal congestion, and upset stomach. Rare but serious effects may include prolonged erections (priapism), severe allergic reactions, or changes in vision, which require immediate medical attention.