One medication that aids in the treatment of male impotence or erectile dysfunction (ED) is cenforce 100 mg. Sildenafil Citrate is the medication's active component. Men with erectile dysfunction are unable of getting and maintaining an erection. This medication is administered either 30 minutes or 1 hour prior to sexual activity. This medication takes four to six hours to take effect. Take this medication as directed by your physician. This medication is only to be used by men who are at least eighteen years old.