Penegra is a medication used to treat erectile dysfunction (ED) in men by enhancing blood flow to the penis, helping achieve and maintain a firm erection during sexual activity. It contains sildenafil citrate, a well-known PDE5 inhibitor that works by relaxing blood vessels and increasing circulation in response to sexual stimulation. Penegra is available in various strengths, including 25mg, 50mg, and 100mg tablets, with the typical dose taken 30 to 60 minutes before intercourse. Its effects can last for up to 4–6 hours, depending on the individual.