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Zenegra 100 mg is a prescription medication used to treat erectile dysfunction (ED) in men. Its active ingredient is sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil helps relax blood vessels and increase blood flow to the penis during sexual stimulation, allowing men to achieve and maintain an erection. It does not increase sexual desire or treat the underlying causes of ED.