I have been on hydrocodone/acetom. for almost 4 years for pain. I have had two heart surgeries and the pain didn't begin till the second surgery. The hydro replaced oxycodone, which I did much better on, but doctor did not want me on. Recently a new doctor(VA) decided I should be switched to morphine, extended release 30mg. I took it for 2 days, pain became too intense so I went back to my left over hydro, which is 10mg/500 actem.. For me, my chest pains came back within 6 hours of taking the morphine, restless leg syndrome came back that night, back pain and neck pain not felt before were present on 2nd night. Next morning I went back to old med. VA doctor will not switch me back, only prescribed more morphine, which I refuse to fill as it is ineffective and useless. I did so much better on oxycodone, which I believe is weaker than morphine, so I guess it's ER visits when the chest pains come back.