Wishbone, if the 20 mg Cialis failed you , then you might try going to the daily 5 mg . It should work for you on a consistent basis.. One thing to remember is that you must take it every day. Now , I need to ask if you have visited a urologist on this matter yet? If not I would suggest you do so..
Because if Cialis and other meds fail to work - there could be valve issues in the penis where they will not hold the blood to maintain the erection even with heavy arousalment.