I had my doubts that CBD would work in place of prednisone but now I'm not sure. I know people have had success with the pain but didn't think that CBD would address the source of the pain in PMR which is inflammation. I did find an article that does support that it might work but I'm not sure.

"CBD may offer an option for treating different types of chronic pain. A study from the European Journal of Pain showed, using an animal model, CBD applied on the skin could help lower pain and inflammation due to arthritis. Another study demonstrated the mechanism by which CBD inhibits inflammatory and neuropathic pain, two of the most difficult types of chronic pain to treat. More study in humans is needed in this area to substantiate the claims of CBD proponents about pain control."
- Cannabidiol (CBD) — what we know and what we don’t: https://www.health.harvard.edu/blog/cannabidiol-cbd-what-we-know-and-what-we-dont-2018082414476