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Filagra is a medication used to treat erectile dysfunction (ED) in men, containing sildenafil citrate, which is the same active ingredient found in Viagra. Sildenafil works by inhibiting an enzyme called phosphodiesterase type 5 (PDE5), which regulates blood flow in the penis. By inhibiting PDE5, sildenafil allows for increased blood flow into the penis during sexual stimulation, leading to an erection. The primary effect of Filagra on blood flow is to enhance the circulation of blood into the penis, which facilitates the achievement and maintenance of an erection. This effect occurs by relaxing the smooth muscle tissue in the blood vessels of the penis, allowing them to dilate and increase blood flow. It's important to note that while Filagra can be effective in improving erectile function, it should only be used under the supervision of a healthcare professional, as it can interact with other medications and may not be safe for everyone, especially those with certain medical conditions such as heart disease. Additionally, Filagra should not be used by women or children.