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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).
  • Studies in animals and/or humans have demonstrated fetal abnormalities.
  • Fetal risk involved in use of drug, clearly outweighs potential benefit.
  • Contraindicated in women who are or may become pregnant. Don’t use.
FDA Pregnancy Risk Categories

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  • For diagnosis and treatment of thyrotoxicosis
  • Fetal Risk
    Fetal Risk
  • It is a human teratogen.
  • Reported to cause spontaneous abortion when used before conception.
  • Exposure in first trimester was reported to cause congenital anomalies including: microcephaly, hydrocephaly, club foot and hypoplasia of hip joints.
  • Use of radioiodine near the end of first trimester and beyond causes partial or complete destruction of fetal thyroid gland.
  • Therapeutic and diagnostic doses should be avoided during pregnancy.
  • Breast Feeding
    Breast Feeding
  • Excreted and accumulates in milk.
  • Breast feeding is contraindicated after diagnostic and therapeutic doses because of possible damage of infant's thyroid gland.
  • 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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