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Heparin and breastfeeding

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Low molecular weight heparins (e.g., dalteparin, enoxaparin) are not excreted into breastmilk in clinically relevant amounts (1):

  • any heparin (low molecular weight (LMWH), or unfractionated) can be used during breastfeeding (2)
    • because heparin has an even higher molecular weight of 3000 to 30,000 daltons, it would not be expected to be appreciably excreted into breastmilk or absorbed by the infant

  • dalteparin can be used during breastfeeding. Infant monitoring is still required (2)
    • as a precaution, infants should be monitored for rare bruising on the skin or any unusual bleeding
    • monitoring the infant will quickly pick up any potential issues, but further investigation is usually required before the cause can be attributed to the medicine

  • enoxaparin can be used during breastfeeding. Infant monitoring is still required (2)
    • as a precaution, infants should be monitored for rare bruising on the skin or any unusual bleeding
    • monitoring the infant will quickly pick up any potential issues, but further investigation is usually required before the cause can be attributed to the medicine

Reference:

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