@kare1
It sounds like your prednisone dose is a little too low. 10 months of treatment for PMR isn't very long. Google says most people need treatment for 9 to 24 months, but some people need it longer.

Here is quote from Google about who Kevzara is recommended for:
"Kevzara (sarilumab) is recommended for adults with polymyalgia rheumatica (PMR) who have had an inadequate response to corticosteroids (steroids) or cannot tolerate a steroid taper. It is typically used for patients who relapse during, or are dependent on, long-term steroid therapy, as demonstrated in studies showing sustained, steroid-free remission. "

Prednisone, Kevzara, and Actemra are all considered high risk drugs because of their potentially serious side effects. Your doctor might recommend Kevzara if he or she thinks you are going to be on prednisone for a long time or if prednisone isn't working well to treat your PMR.