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Viagra is a prescription medication used to treat erectile dysfunction in men. It contains the active ingredient Sildenafil, which belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. By increasing blood flow to the penis during sexual stimulation, it helps men achieve and maintain an erection. This medication is intended for use only under the supervision of a healthcare professional. It does not protect against sexually transmitted diseases and is not intended for use by women or children.