There are many different pain meds, and you have to work with your doc to figure out the best combo for YOU. It can take years to figure it out.

Generally the best idea is to start with a low dose Extended Release opiate. Dosages and amounts are steadily increased until you get to a level where you're at your highest level of function--where the side effects of the meds such as drowsiness don't make you sleep too much for example.

Then, an Immediate Release opiate can be added in to help with pain spikes.

You must work with a doc that is experienced with RSD and or severe pain patients. To do otherwise could be dangerous. It's a good idea to find a pharmacist that will pay attention to your RXs, and will refuse to fill if they're written wrong or if it would be dangerous to take as prescribed. Docs are human and make mistakes!