Can a mother with hyperthyroidism continue to take hyperthyroidism medication while breastfeeding? I am posting this question to help more people. Oral antithyroid drugs can be taken during breastfeeding, but with the following precautions: 1) Methimazole is preferred and propylthiouracil is not used as much as possible (potential for serious liver toxicity); 2) The total daily dose of methimazole should not exceed 20-30 mg and the total daily dose of propylthiouracil should not exceed 300 mg; 3) Each time you take the medication, take it immediately after breastfeeding and do not Do not breastfeed for a short time after taking the medicine.