I am now 10 1/2 weeks post op for L4-S1 PLIF. I have been in severe pain for about 2 weeks now (mostly in my left buttocks cheek area). The OS says it is from the bone graft site. However, the pain is just horrible, even with the pain meds. I have been taking Percocet 5/325 since the surgery & was down to only 2 a day before this pain started. I have lately been taking 8 or more a day. Yesterday the OS gave me Oxycontin 20 mg, but it does not seem to be helping.....I realize they are both the same drug, with the Oxycontin being a controlled release, acetaminophen-free form vs. the Percocet being immediate release with the added acetaminophen. I am right now in AGONY. The OS is not in the office today....Does anyone know if it is safe to take both drugs at the same time? I took the Oxycontin at 4:30 AM, but it doesn't feel like I took anything!