I recently tore my ACL and my MCL in my knee, as well as having suffered some nerve and cartlisge damage. they prescribed me ULTRACET. I have found its side effects to be quite a problem, and it seems to already be habit forming. But it does make the pain go away. WHile on it i am experianceing VErtigo, Confusion, and Euphoria.... I was once addicted to sleeping meidcation and i beleive that this is triggering another addiction... in short, do not take if you have an addictive personality, but it is good for severe pain