Hello, I have never done this before, so I hope I am clear. I am also quite ill, so I might be confusing. I have been taking loratab at high doses for probably eight to ten years, maybe longer, every day, I am guessing at least four a day or more 10/500. I recently got a new script from a compound st that does not have Tylenol. I switched and have been sicker than a dog. Could the sudden stop of the Tylenol cause me to have the flue like symptoms? Thank you so much! Dana