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Drugs and Lactation Database (LactMed®) [Internet]. Bethesda (MD): National Institute of Child Health and Human Development; 2006-.

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Drugs and Lactation Database (LactMed®) [Internet].

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Lactulose

Last Revision: February 15, 2026.

Estimated reading time: 1 minute

CASRN: 4618-18-2

image 403405077 in the ncbi pubchem database

Drug Levels and Effects

Summary of Use during Lactation

No information is available on the clinical use of lactulose during breastfeeding. Because lactulose is poorly absorbed orally, it is unlikely to reach the breastmilk in large amounts. Any lactulose that the infant absorbs from milk is rapidly eliminated in the urine.[1] Some experts consider lactulose to be a laxative of choice during breastfeeding.[2] Lactulose is unlikely to adversely affect the breastfed infant and no special precautions are required.

Drug Levels

Maternal Levels. Relevant published information was not found as of the revision date.

Infant Levels. Relevant published information was not found as of the revision date.

Effects in Breastfed Infants

Relevant published information was not found as of the revision date.

Effects on Lactation and Breastmilk

Relevant published information was not found as of the revision date.

References

1.
Mank E, van Harskamp D, van Toledo L, et al. Simultaneous assessment of intestinal permeability and lactase activity in human-milk-fed preterm infants by sugar absorption test: Clinical implementation and analytical method. Clin Nutr 2021;40:1413–9. [PubMed: 32948350]
2.
Gharehbaghi K, Gharehbaghi DR, Wierrani F, et al. Treatment of chronic functional constipation during pregnancy and lactation. Z Geburtshilfe Neonatol 2016;220:9–15. [PubMed: 26866689]

Substance Identification

Substance Name

Lactulose

CAS Registry Number

4618-18-2

Drug Class

Breast Feeding

Lactation

Milk, Human

Gastrointestinal Agents

Laxatives

Disclaimer: Information presented in this database is not meant as a substitute for professional judgment. You should consult your healthcare provider for breastfeeding advice related to your particular situation. The U.S. government does not warrant or assume any liability or responsibility for the accuracy or completeness of the information on this Site.

Copyright Notice

Attribution Statement: LactMed is a registered trademark of the U.S. Department of Health and Human Services.

Bookshelf ID: NBK618289PMID: 40986680

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