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Zenegra 100 mg is a medication used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate, which belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. Here are some key points to know about Zenegra 100 mg:sildenafil citrate works by inhibiting the enzyme PDE5, which regulates blood flow in the penis. By blocking PDE5, sildenafil citrate allows the blood vessels in the penis to relax and widen, increasing blood flow during sexual stimulation. This helps men achieve and maintain an erection sufficient for sexual activity.