I was taking 2 10mg oxycontins but the cost is too expensive, the percacets are covered for me unlike the oxycontins im wondering if i started taking 4 percacets would it be the same as taking the 2 oxycontins or would they be worse for me/not as good pain relief? What about the acetaminophen in them is that harmful for long term use? I use them for chornic neck/back pain