This is interesting information, RR. Everyone should educate themselves about pain relief options, and not under the circumstances I was forced to.
I had my knee surgery Monday, and it turned out that the opioid I was prescribed had absolutely no effect on the pain. Even in increasing doses - just made the pain feel more intense. I had to dose myself again at 2 in the morning and knew the shit wasn't working, and so went on the internet to find an alternative. I took 600 mg of ibuprophen and finally got relief. Especially helpful was ibuprophen's ability to reduce swelling, since my freshly stitched up knee was bound and pressing against the hard plastic of my brace no matter how I turned.
Found all this out while in agony in the middle of the night by means of the internet, reading stuff just like this. So thanks, RR.