Penegra helps men who have erectile dysfunction. This medication inhibits PDE-5, which inhibits the enzymes that lead to erectile dysfunction. It improves blood flow to the muscles by relaxing the blood vessels. These tablets are available for purchase on our website, where you can also read Penegra user reviews. The medication can be taken four hours prior to an exercise. The dose of this medication will change according on the patient. Your doctor could also change your dose if needed.