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Generic Name
Trade Name
Risk Category
  • Positive evidence of human fetal risk exists.
  • Potential benefits may warrant use of the drug in pregnant women despite potential risks (e.g. life threatening situations or serious illness).
FDA Pregnancy Risk Categories

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  • Antithyroid.
  • Fetal Risk
    Fetal Risk
  • Crosses the placenta. Suggested association with scalp defects (aplasia cutis), umbilical defects, skin defects and hypospadias.
  • May cause fetal hypothyroidism so the lowest dose to control maternal disease should be given.
  • Breast Feeding
    Breast Feeding
  • Excreted into milk. Safe in breast-feeding if given in small doses (10-15 mg /day or less) and in fant’s thyroid function is closely monitored.
  • Other Trade Names
    The information on this Web site is not intended as a substitute for the advice and care of your doctor or other health-care provider. Always consult your doctor if you have any questions about exposures during pregnancy and lactation, and before you take any medications. Please read the Terms and Conditions before using this website.
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