I Saw My Pain Management Doctor Today And Am Having

I saw my pain management doctor today and am having spine surgery on the 24th of this month. I have been on percocet for over a year and I want to say that he said he will write a prescription for a stronger pain medication for after the surgery. I didn't write it down but I think I remember him saying something like "dia" something. Dialotin, but still not sure. I just wanted to research this drug before I take it. Can you help?