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A member asked:
Can it take longer for synthroid (thyroxine) to work vs. levothroid?
A doctor has provided 1 answer
No: They should work in the same time frame. However, it is always good when switching brands of l-thyroxine to recheck thyroid hormone levels about 6 weeks afterwards, to make sure you are stable on the new brand.
Answered 4/8/2013
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