Dextrothyroxine
Risk Factor: C
Class: ANTILIPEMIC AGENTS
Contents of this page:
Fetal Risk Summary
Breast Feeding Summary
References
Questions and Answers
Fetal Risk Summary
Dextrothyroxine is the dextro-isomer of levothyroxine (see also Levothyroxine). Although formerly used to treat hypothyroidism, the drug is now used exclusively for the therapy of hyperlipidemia. In a study of placental passage of dextrothyroxine, approximately 9% of a radiolabeled dose given 28 hours before delivery was found in the cord blood (1). Except for this one report, no mention of its use in human pregnancy has been located.
Breast Feeding Summary
No data are available.
References
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Kearns JE, Hutson W. Tagged isomers and analogues of thyroxine (their transmission across the human placenta and other studies). J Nucl Med 1963;4:45361.
