"A systematic examination of the peer-reviewed literature, which included 30 studies, found that most patients seemed to achieve remission of PMR with a starting dose of prednisone at 15 mg/day. A slow tapering of the prednisone, less than 1 mg/month, was associated with fewer relapses. Once prednisone is tapered to 10 mg/day, a further slow taper by 1 mg every 2 months until treatment discontinuation was associated with optimal control of disease activity."
https://emedicine.medscape.com/article/330815-treatment
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It would be better to see what your doctor recommends. However. staying on 5 mg for a month or two is reasonable. You really need to have 1 mg tablets when your dose is less than 10 mg.