Np thyroid Pregnancy Warnings
Animal studies have not been reported. Thyroid hormones do not readily cross the placenta. Clinical experience to date does not indicate any adverse effects on the fetus when thyroid hormones are administered to pregnant women. There are no controlled data in human pregnancy.
US FDA pregnancy category A: Adequate and well-controlled studies have failed to demonstrate a risk to the fetus in the first trimester of pregnancy (and there is no evidence of risk in later trimesters).
Use is considered acceptable.
US FDA pregnancy category: A
See references
Np thyroid Breastfeeding Warnings
Caution is recommended.
Excreted into human milk: Yes
Comments:
-Liothyronine (T3) and levothyroxine (T4) are normal components of human milk; if replacement doses are required by the mother, it is not necessarily a reason to discontinue breastfeeding.
-Dose requirements may be increased in the postpartum period compared to pre-pregnancy requirements in women with Hashimoto's thyroiditis.
See references
