My mom is 87 and recently diagnosed with Rhuematoid Arthritis. The specialist put her on a new RA drug and a daily dose of predisone. Can predisone cause personality changes? She has had a couple of outbursts that are not typical for her since starting the drug a few months ago. She called me tonight and told me that a family member (he lives at her house....keeps an eye on her)set a firecracker off in the house, then she changed the story and said that he had lite something and took it through her house causing the house to smell of smoke....I rushed over and there was absolutely no smell in the house indicating any of this. She claims he "got rid of the smell". I dont know how he would do that as the storm windows are in place and the windows can't be opened, plus fireworks smell doesnt disapate easily. I asked her why her smoke detectors didnt go off...she got mad at me and told me that I didnt believe her.... The family member said that he had no idea why she would think he had set a firecracker off in the house. He said he had purchased some bottle rockets and showed them to her and that he had set one off outside much earlier in the day. I had read somewhere in the med info packet that the drug could have some serious side effects.