Viagra, a brand name for sildenafil citrate, is a medication well-known for its role in treating erectile dysfunction (ED) in men.
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Viagra belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. It works by blocking the enzyme PDE5, which can restrict blood flow to the penis. By inhibiting PDE5, Viagra enhances the effects of nitric oxide, a natural chemical the body produces to relax muscles in the penis. This relaxation increases blood flow, allowing an erection to occur in response to sexual stimulation.