Cenforce 25 mg is a very popular drug used to treat impotence or sexual problems. Sildenafil citrate is the active ingredient in this medicine. The use of this drug allows blood to flow better in the muscles in the body. Excessive use of tablets in the lure of better results can be harmful. The effect of this drug is in 30-40 minutes and lasts for 4-6 hours. This medicine is 100% safe and natural.