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Penegra 100 mg is a medication commonly used to treat erectile dysfunction (ED) in men. It contains sildenafil, which is the same active ingredient found in Viagra. Sildenafil works by increasing blood flow to the penis, helping to achieve and maintain an erection when sexually stimulated. Common side effects include headaches, flushing, dizziness, upset stomach, and nasal congestion. If you experience sudden vision loss, hearing loss, or an erection lasting more than 4 hours (priapism), seek medical help immediately.