<s>[INST] Had metal put in my arm last year, had it taken out in january due to massive infection.Hydrocodone used to do wonders for my pain, but does nothing anymore. Doctor tried putting me on oxycodone, but I don't feel it at all. My arm hurts all the time. What can I do? [/INST] HI WelcomeYes you can start  Oxycodone, It is better than Hydrocodone .How1-5 mg Oxycodone=7.5 mg Hydrocodone.2-Oxycodone has Anti Depressant effect3-Does not cause Euphoria.4-Oxycodone could be used without Paracetamol but Hydrocodone not.5-Safer for liver in long run.In my opinion Tramadol is to be used for mild to moderate pain & Oxycodone for severe pain. Take any medicine all are harmful.Don't take any medicine  without discussing with your doctor.Thanks for query. </s>