Penegra 50 mg is a medication used to treat erectile dysfunction (ED) in men. Its active ingredient is sildenafil citrate, a PDE5 inhibitor that helps improve blood flow to the pill during sexual arousal. It works by relaxing the smooth muscles in the corpora cavernosa, the sponge-like chambers of the pill, allowing them to fill with blood and produce an erection. The effects of Penegra 50 mg usually begin within 30 to 60 minutes after taking the tablet, and the medication can remain effective for up to 4–5 hours. https://www.genericday.com/penegra-50-mg.html