People seem to be reluctant to mix medications for fear of drug interactions. They want a strong dose of one substance.
But nothing has worked for me better than mixing acetaminophen with ibuprofen or with naproxen. All are cheap, available over the counter, and have fewer side effects than prescription pain killers.
I also find that, after the initial pain subsides, I can more quickly reduce the dosage of these drugs than I could with prescription painkillers.
By all means, use oxy if you need it. But please consider trying alternatives first so you can avoid addiction.