Opana comes in two forms, an immediate release formulation like Percocet, and an extended release formula.
I wonder, though, if Opana is the best next choice. The medication is oxymorphone, which is quite strong when given IV, but when taken orally not much really gets into your central nervous system. The one good thing about Opana is that you would no longer be taking so much tylenol, which comes to about 325mg in each Percocet tablet. Since the doc is willing to Rx Opana, how about just going to "single entity" oxycodone. This is the narcotic med in your Percocet. If he prescribed immediate release oxycodone it could be in a higher dose than is in Percocet. Since you already know that oxycodone has worked for you, maybe all that's needed is a higher dose. That's what I'd go for if I were you.
Here are a few examples of "single entity" oxycodone prescriptions:
-OxyIR comes as a 5mg tablet of oxycodone.
-Roxicodone comes as a 15mg tab and as a 30mg tab of oxycodone.
-OxyFast & OxyDose come as a concentrated oral solution (20mg/ml)
I use OxyDose. It's very easy to dose as its a liquid with a dropper and your doc can Rx whatever he/she likes. You could be given anything from 2.5 to 20mg of oxycodone from a single dropper full.
Hope this helps...