I have pain resulting from a bad accident in 1995. I have been taking hydrocodone oxycodone for quite a few years. It has gotten to the point that it isn t working anymore. I am taking 7.5/325 one or two every four to six hours. My leg pain is so bad that at times I take up to 12 a day. They say it is siatica. Is there any thing else available, maybe by injection or IV, that would have a longer term effect? I have COPD, emphysema, A-Fib, A-Flutter.