Avinza, 10/325 Percocet 3XDay, 600MG Neurontin daily. I wanted something cheaper than the Avinza so Dr. put me on Fentanyl 50 which I just started. Was wondering if anyone thought Fentanyl is better than Avinza? Right now I am having severe Sciatic pain. I have had surgery and have 4 fusions with rods and screws still in my back. Thanks for help or advice from anyone. Also have swelling in feet.