If I take methimazole will it harm my baby?

Yes, it may cause harm to the baby. Methimazole is not recommended during pregnancy. It has been assigned to pregnancy Category D by the FDA, which means that there is strong evidence that it can harm your baby if you take it during pregnancy.

Methimazole can cross the placenta and enter the fetus's bloodstream to cause goiter and hypothyroidism after the infant is born, which are risk factors for mental retardation. The goiter could get large enough to block the infant's airway and cause breathing problems. On rare occasions methimazole during pregnancy can cause congenital defects of the scalp, esophagus, trachea, nose and nipples. Pregnant women should take other medicines for hyperthyroidism.

Sometimes when a woman with hyperactive thyroid disease becomes pregnant, her thyroid hormone levels change for the better, so it is possible that methimazole may not be needed. However, if you are planning on becoming pregnant discuss alternate treatment options beforehand. If you discover you are pregnant while you are taking it, notify your doctor as soon as possible.

Nursing is also not recommended, but if you are taking less than 20 mg./day you can minimize the amount your baby gets if you take methimazole when you are done nursing and wait for three to four hours before nursing again. This way your baby gets the least amount possible.

Continue Learning about Endocrine-Metabolic Agent

Why is glucagon important for people with diabetes?
Sigma NursingSigma Nursing
Glucagon is a hormone produced by the pancreas. It is important to know about this hormone if you ha...
More Answers
Does ospemifene have any side effects?
Donna Hill Howes, RNDonna Hill Howes, RN
Side effects may include hot flashes, vaginal discharge, muscle spasms, and excessive sweating.  Os...
More Answers
What is growth hormone treatment?
Jumo HealthJumo Health
Growth hormone treatment is a therapy that may help kids with growth hormone deficiency (GHD) grow t...
More Answers
Who should avoid taking oral bisphosphonates?
David Slovik, MDDavid Slovik, MD
While bisphosphonates are quite effective in preventing fractures, the oral forms may not be the...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.