Penegra 100 mg is a medication that contains sildenafil citrate, the same active ingredient found in Viagra. It is primarily used to treat erectile dysfunction (ED) in men by improving blood flow to the penis, allowing men to achieve and maintain an erection during sexual activity. Sildenafil inhibits the enzyme phosphodiesterase type 5 (PDE5), which usually breaks down a substance called cGMP that helps relax the smooth muscles in the blood vessels of the penis.

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