Drug allergy: Levothyroxine is the generic name of a type of thyroid hormone, which several different companies make. It is possible that you are allergic to one of the nonactive ingredients (filler/coloring) in one maker's pill, but not another, especially if you took this medicine in past without difficulty. Ask your pharmacy if generic maker was changed recently. Rarely, u could be allergic to levothyroxine
Answered 3/31/2015
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