I can only speak from personal experience with Actemra (tocilizumab) which was offered to me 13 years after the onset of PMR. I was able to taper completely off prednisone. I don't know if I would feel the same if I ended up needing prednisone AND Actemra.

My rheumatologist told me before starting Actemra --- if I only needed 3 mg of prednisone, Actemra never would have been offered to me. For Actemra to be approved for me, other alternatives like methotrexate had to be tried.

Vis-à-vis prednisone, I have practically no side effects from being on Actemra for 5 years. Additionally, many of my prednisone side effects resolved after Actemra was started.

There was no guarantee that I wouldn't have any side effects from Actemra. Likewise, there was no guarantee that Actemra would even work for me. My rheumatologist said we wouldn't know these things unless I tried Actemra. The same applies to Kevzara.

I'm glad that I decided to try Actemra and I have no regrets. If I develop side effects or if Actemra stops working, I now know that Actemra can be easily stopped when it wasn't easy to discontinue Prednisone. Now, my rheumatologist says Kevzara is another option for me.

When I was warned about the "potential" side from Actemra. I did a side by side comparison of potential side effects from Actemra with those of Prednisone.
https://www.drugs.com/compare/actemra-vs-prednisone
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You can do something similar with Kevzara.
https://www.drugs.com/compare/kevzara-vs-prednisone
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It is good to get personal experiences from people who have used Kevzara. That would be better because I haven't ever been on Kevzara but I'm told it is similar to Actemra.
https://www.drugs.com/compare/actemra-vs-kevzara
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I wish you luck with whatever you decide.