Hello @betsyhase, I saw your other discussion that mentioned you were recently diagnosed with PMR and started on 12 mg prednisone and you found out you had really bad pain the next morning and you have been trying to figure out how to split the dosage to help. I never really tried splitting the dosage but my starting dose was enough to quell the pain until the next mornings dose of prednisone. For both occurrences of my PMR, my starting dose was 20 mg. I think the average starting dose is 15 to 20 mg.

I wonder if the following discussions might be helpful:
-- Do I need a higher dose?: https://connect.mayoclinic.org/discussion/do-i-need-a-higher-dose/
-- How to Slowly and Safely Taper Off Prednisone but ... no set rules.
https://connect.mayoclinic.org/discussion/how-to-slowly-and-safely-taper-off-prednisone-but-no-set-rules/
You mentioned having brain fog. I didn't have brain fog with prednisone treatment of either of my PMR occurrences but I think it's something you should discuss with your doctor if you haven't already to see if there may be an alternative treatment.