This may not work in your case; insurance companies are so complicated, and state laws vary. But when my pharmacy didn't have the prednisone (my doctor had sent in the prescription by computer), I was able to go to another pharmacy (from Kroger to Sam's club) and have Sam's club pharmacy call the Kroger pharmacy to get the prescription transferred. I think I may have had to give the Kroger pharmacy permission first. But anyway, I was able to get the two pharmacies to transfer the digital prescription between them.
It may not work in your case, but hopefully you won't ever run into that situation again. It's so frustrating. And I definitely agree, common asthma meds like prednisone and Xopenex should be readily available, especially this time of year. I've been on a lot of asthma meds this summer, and it seems like I've had difficulty getting several of them.