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Methimazole during pregnancy

Methimazole is an antithyroid agent. It is prescribed by doctors to treat over production of the thryroid hormone by the thyroid gland, or hyperthyroidism.

How methimazole works

Methimazole controls the production of thyroid hormoneA compound secreted by the thyroid gland containing iodine. Thyroid hormones increase the rate of the metabolism, regulate body temperature, protein, fat and carbohydrate catabolism, control secretion of growth hormone, the maturation of the skeleton, cardiac rate, force and output, stimulate enzyme synthesis and are necessary for muscle tone and vigor.
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by interfering with the body's ability to use iodine in its manufacture.

Methimazole and pregnancy

An overdose of methimazole during pregnancy may lead to problems with the fetus. Control over the prescribed dose and its administration along with careful monitoring will minimize the risk of potential problems.

Methimazole passes into the breastmilk. Your doctor may allow you to breastfeed your baby if your requirements are sufficiently small and the infant is carefully monitored.

There is no evidence that use of methimazole by infants and children causes more side effects that it does in adults.

Known food interactions

Your doctor will want to ensure that you are eating a low iodine diet while you are using methimazole.

Consult your doctor about potential interactions when consuming alcohol while using methimazole.

Disease interactions

Consult your doctor before taking methimazole if you have a history of liver disease since this organ removes the medication from the body.

Drug interactions

Consult your doctor before taking methimazole if you are taking any of the following drugs, medications or supplements.

  • amiodarone
  • iodinated glycerol
  • potassium iodide
  • anticoagulants
  • digitalis drugs
Reasons to consult your doctor

  • Contact your doctor immediately if you experience any of the following symptoms:
  • coughing
  • continuing or severe fever or chills
  • general feeling of illness
  • hoarseness
  • mouth sores
  • pain
  • redness in the joints
  • swelling
  • throat infection
  • yellow discoloration of the skin or eyes
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