methadone 50mgs. every am. the dr. put me back on oxycontin 20 mgs twice a day and i'm worried because i have been told that they have changed oxycontin and oxycodone and put naltrexone in them which with my methadone will cause me to go through withdrawls. yes, i am honest with my dr and he knows i am on methadone. when i got this new oxy's filled the color was the same but instead of having oc 20 they have op20 on them and i don't want to die! will someone please tell me why or if i was given the wrong rx. i was told that there are no generic's for oxycontin .