Cenforce FM 100 is one drug used to treat erectile dysfunction or impotence. The sildenafil component of this medication helps to increase blood flow to the penis. To ensure that you have quality time with your partner, take this medication 30 minutes before engaging in sexual activity. Check out our store's Cenforce Side Effects. When taking a tablet with water, avoid chewing, breaking, or ripping it. It takes four to six hours for this medication to start working. Because this medication has some side effects as well, take it as prescribed by your physician. You can take this medication with or without food.