Hypothyroidism (underactive thyroid)

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    Todd B. Nippoldt, M.D.

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Question

Hypothyroidism: Can calcium supplements interfere with treatment?

Can calcium supplements interfere with hypothyroidism treatment?

Answer

from Todd B. Nippoldt, M.D.

Yes. Calcium supplements can interfere with your body's absorption of levothyroxine (Levothroid, Synthroid, others), a synthetic thyroid hormone. But this problem primarily occurs when you take calcium supplements and levothyroxine at or near the same time. To avoid an interaction, take calcium supplements at least four hours before or after you take levothyroxine.

Next question
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References
  1. Synthroid (prescribing information). North Chicago, Ill.: Abott Laboratories; 2008. http://www.accessdata.fda.gov/drugsatfda_docs/label/2008/021402s017lbl.pdf. Accessed Aug. 31, 2009.

AN01181

Oct. 17, 2009

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