I have just received my prescription for Levothyroxine but it is now TEVA - New Formulation. Within hours I was itching and had red pin prick spots all over. My pharmacist said she could not change my brand as it was the only one she used so gave me antihistamen which cools it down but I still itch. I have taken levothyroxine for years without any side effects but this one is unreal. What can I do? I dont want to keep taking the antihistamen. I also felt really unwell and very tired.