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  1. Sildenafil works by blocking an enzyme in the body called PDE5, which helps relax certain blood vessels. For erectile dysfunction, it increases blood flow to the penis when aroused. This makes it easier to get and keep an erection.
    www.webmd.com/drugs/2/drug-7418/sildenafil-oral/details/
    www.webmd.com/drugs/2/drug-7418/sildenafil-oral/details/
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