... and Arthritis and several bulging and herniated disks with edema on the spinal cord and my Doctor added Fibromyalgia to the mix... previous Doctor had me taking Percocet 10/325 ever 4 hours, then do to Insurance switch, I had to get a new Primary and Pain Management, we tried Cymbalta, Lyrica, Savella with 10/325 of Percocet for pain 2 to 3 x day…then Fentanyl (rash all over ), Opana (morphine allergy) and he finally put me on OC 30mg 2x day plus 15 mg oxycodone x 3 day….. have been on that combo for 2 months ( worked great, able to sleep more then 3 hours a night and actually functioning) then on my next refill the pharmacist gave me some of the new and some of the old of the Oxy 30... I did not think anything of it (except the OP does not work as well as the OC), in December I did a routine urine test and it came back showing that I was taking something else... "bitiruate"? Told my Doc. that the only medication I take is what you and my primary Doctor prescribe (Primary gives me Lasix 20 mg and Zanax ) In Jan. my Pain Doc. requested another sample and I just came back from the Doc. Office in shock... he stated that the urine came back positive for "bitiriate" again and he said it was Vicodin ??? and he will not be seeing me as a patient anymore…I told him that the pharmacy has been giving me two different types of pills for the Oxycontin and he said “they are supposed to give you what I write and I don’t care if it’s a new formulation” I went to my Primary immediately and she is trying to get me signed up for a different Pain management…has anyone else had the same experience ? I am not sure why this is happening…