My daughter has been showing allergic reactions to her hydrocortisone for 2 years. Bad headaches & itching eyes upon taking a tablet. She has hypopituritsm. Her doctor put her on prednisone which does not seem to be working. We cannot find anything in all brand ingredients which it could be. I'm very concerned as these drugs keep her alive. Is it common for someone to be allergic to the hydrocortisone itself? I'm presuming it is a filler. She also has reactions to dexamethasone. The low cortisol problems make her feel very unwell. She is better when she takes a hydrocortisone tablet but then suffers the side effects. Any suggestions? Many thanks