I was prescribed 25mg Levo-thyroxine after being told that one of the many tests for hypothyroidism had come back 'borderline'. I have been suffering the advanced symptoms of untreated Hypothyroidism for years and currently have very poor quality of life healthwise. However, after seven days I had to stop taking them after I experienced the most agonising pains in my kidneys. This went on for some days even after I had stopped taking them. Perhaps they contained something I am allergic to so it looks like it's back to the drawing board.