Men who suffer from erectile dysfunction take the medication filagra. This medication might be the best one for treating erectile dysfunction. An element in this medication known as sildenafil aids in boosting blood flow to men's penile tissues. This medication is taken half an hour prior to sexual activity so that you can enjoy sexual activity with your partner. This medication can be used either before or after food. This medication takes four to six hours to take effect. Only men between the ages of 18 and 65 may use this medication.