One medication used to treat impotence is Cenforce 100mg. For erectile dysfunction, this medication works incredibly well. Take this medication half an hour prior to sexual activity so that you can enjoy quality time with your partner. An ingredient in this medication called sildenafil helps men's penile tissue receive more blood flow. This medication takes four to six hours to take effect. Take this medication orally with water and avoid breaking or chewing it. As prescribed by your physician, you should take this medication. Avoid taking this medication with alcoholic beverages or high-fat foods. Only men who are at least eighteen years old can use this medication.