Synthroid for hypothyroidism

My nursing son is 12 months old. I have been taking Synthroid for hypothyroidism since I was eight months pregnant. I would like to discontinue the Synthroid and take nutritional supplements instead. Have you heard of adverse side effects in nursing babies? Do you think it's safer to just continue the Synthroid?

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Debbi Donovan

Debbi Donovan is a Board Certified Lactation Consultant, as well as a retired La Leche League Leader. For more than a decade, Debbi... Read more

Synthroid (levothyroxine) is secreted into human milk, though most likely in very low levels (Hale 1997). "Use of proper amounts of thyroid hormones by mothers has not been shown to cause problems in nursing babies" (InteliHealth US Pharmacopeia 1996).

Your baby's thyroid function can be monitored if levels are a concern. When testing, it should be remembered that thyroxine levels are significantly higher in breastfed babies than in formula fed babies, so testing should include measurement of both T4 and TSH concentrations (Riordan, Auerbach, 1993).

It is my feeling that before you make any changes in your medication, you need to discuss this with your Health Care Provider. If you are very interested in trying a natural remedy he may suggest a way for you to wean yourself off your medication, and schedule regular blood tests to check your thyroid function as you make these changes. Best wishes!

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