I have got a script for hydro from my PCP and two days later caller her and told her this was not cutting it and she wrote me a script for Percocet. I took the script to the local drugstore and have never had a problem with them or my insurance. I think as long as you have a new script that is changing the amt per day or changing the amt per dose that is considered different treatment so you should have no troble. I could be wrong, imagine that, but I have never had a problem in this situation.