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Penegra 50 is a medication that contains the active ingredient sildenafil citrate, which is commonly used to treat erectile dysfunction (ED) in men. Sildenafil citrate is a phosphodiesterase type 5 (PDE5) inhibitor, and it works by increasing blood flow to the penis when a man is sexually aroused, allowing for the achievement and maintenance of an erection. Penegra 50 contains sildenafil citrate, which is the same active ingredient found in other well-known ED medications, such as Viagra.