I am just now reading this for the first time and apologize for missing it. I hope the vet will be able to find the root cause quickly. You had said "prednisolone" was the medicine and I think others may be confusing it with Prednisone (a steroid). I am assuming the prednisolone is an allergy medicine?

Anyway, no matter what the medicine, I certainly hope that Pepper will get some relief quickly. Give him a kiss on his cute little furry head from me and my gang and please do keep us posted. {{{hugs to Pepper}}}