Hi zaa, A higher dosage of prednisone is needed to manage GCA. I wqas put up to 40 mg, when the rheumatologist suspected GCA. He took my height and weight into account, 4'11" and 95 lbs. Thirty years ago, my mother-in-law was put on 50 mg for GCA. I think she was on it a long time, and lived to be nearly 100. I'm on a tapering schedule - down 5 mg every two weeks if symptoms don't come back. I'm down to 25 mg now and will go down to 20 mg on Thursday. So far, everything is good. I had a dexa scan a couple of weeks ago and it's consistent for osteoporosis - so I'm now working on that. I've exercised consistently for the last 25 years, but have a strong family history of osteoporosis.
The consequences of GCA can be stroke or blindness so I'm grateful for the higher dosage of the prednisone, despite its side effects. Best to you..