skip to main content

brainstorm askiatroX medicines

simulations beta

loading page…

learn & practise

exams international doctors free questions Socratic Tutor rounds stat clinical connections academy journal tool guides

clinical reference

askiatroX knowledge centre medicines UK / NICE guidance international guidance calculators q&a library

trust & support

how it works methodology account & support frequently asked questions about us clinical safety consultancy

legal

mobile app · scan to download

Medicines LevothyroxineQuestion & answer

Levothyroxine · Medicine question

Does levothyroxine pass into breast milk?

iatroX medicinesPublished 8 November 2026

The answer

Answer

Yes, levothyroxine passes into breast milk in low concentrations, and whether this can interfere with neonatal screening is disputed.

Sources for this answer

Levothyroxine 25 micrograms TabletsWockhardt UK Ltd · emc · SmPC §4.6 Fertility, pregnancy and lactation · Version 11Document updated 11 July 2023

Sources checked 8 November 2026

Explore this learning need in CPDTake this topic to CPD, then choose your learning context and available question library.

The full medicine guide

Levothyroxine

More questions about Levothyroxine

Why is combining levothyroxine with antithyroid medicines for hyperthyroidism not indicated during pregnancy?Can levothyroxine cause temporary hair loss in children?How does levothyroxine affect cell metabolism?How does levothyroxine affect warfarin's anticoagulant effect?How does orlistat affect levothyroxine absorption?What condition is levothyroxine used to treat?

Read the wider context, including uses, precautions and the sources behind this medicine guide.

Read the Levothyroxine guide

More clinical questions?

Explore the tools and reference material available on iatroX.

Explore askiatroX