"i had been on hydrocodone for quite a few years for a  repaired again (3rd time) left knee, and un repairable right shoulder (rotator cuff) work related. i along with my new doctor (recently moved), decided that with the tightening of regulations and seems more and more of a stigma associated with hydrocodone, decided to try the ultracet. first, i had no withdrawals from the switch off of hydrocodone( which was a big concern of mine because of how long my previous doctor had prescribed hydrocodone). second, the pain is controlled just as well with ultracet. i thought it would not do as good of a job. third, whether it is believed or not, my head is much clearer. i do not  feel like i am impaired (at all).great medication!"