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Systematic treatment with thyroid hormones is of special importance during pregnancy and the nursing period and must therefore be maintained.
During pregnancy, however, levothyroxine should not be taken together with medication for the treatment of hyperthyroidism (antithyroid drugs) as additional intake of levothyroxine may make a higher dose of the antithyroid drug necessary.
In contrast to levothyroxine, antithyroid drugs cross the placenta and can cause decreased thyroid activity in the unborn infant.
