I have been allergic to NSAIDS for some time now, but my Dr prescribed Fiornal for headaches related to MS. I asked him a million times if this was ok to take because of my allergies and he said it would be fine. Well, I ended up in the emergency room with hives and swelling from my head to my toes!! If you cant take any NSAIDS (Non Steroidal Anti Inflammatory Drugs) stay away from this!!!!!!!!