I sometimes get pain in my lower back and my doctor prescribes Flexeril. I get the generic version for $4 for 30 pills at Walmart. There is no high, but the pain goes away. It also will make you a bit drowsy.
A few years ago I had severe carpal tunnel syndrome in both hands and took oxycodin for a few weeks until I had surgery. I found oxy worked great the first week and then I sort of became immune, it would no longer effect me after that.