In 8/06 I was switched from generic to the brand name LEVOXYL and developed horrible problems. After 4 months I finally connected the dots and went to my doctor to get my levels checked. Sure enough they were too high. After lowering the dose most of the side effects went away but I am still suffering from anxiety and trembling. An all over, full body trembling. Like a haven't eaten. Which of course make the anxiety worse because now I am sure I have MS or Parkinson's. I am still working with my doctor but he seems to be fighting me on the idea that it is the LEVOXYL. We shall see.