Below 5 mg. the adrenals have to pick up the slack and restart producing cortisone. Decreasing Prednisone slowly is a good idea. My experience is that it is difficult to distinguish pmr pain from prednisone withdrawal. I have finished 3 weeks at 2 mg. and dropped to 1.5 mg. but don't have the same energy I did when I started at 20 mg. suggesting to me that my adrenals aren't up to the challenge. It took me 15 months to drop to 5 mg. At 75 years old there are aches and pains that I cannot blame on the lack of meds 🙂