Need to find a pharmacy that sells injectable cortizone!

My Dad has a condition that is similar to addison's disease. He needs to take cortizone daily or his condition becomes life threating. He had food poisoning this week and could not keep his medication in his stomach and his situation became life threatening ang 911 was placed and he was rushed to the emergency room where they injected him emmediatly with cortizone and was better in minutes. He has a perscription for injectable cortizone but we canot seem to be able to get it. There are no pharmacies in our area that sell injectable cortizone. Does any one have suggestions of where I could find it? Thanks in advance