<p>Cenforce 100 mg, one of the most popular medicines in the world, is used to treat impotence and erectile dysfunction, or ED. Sildenafil is the active substance in Cenforce. The muscles and blood vessels of the penis are relaxed, which improves blood flow and makes it easier for a man to erect himself. Cenforce should be taken within 60 minutes of sexual activity to make it easier to get erect. Remember that flushing and brief vision issues are typical side effects.</p>