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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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Omadacycline

Last Revision: June 15, 2025.

Estimated reading time: 1 minute

CASRN: 389139-89-3

image 135263120 in the ncbi pubchem database

Drug Levels and Effects

Summary of Use during Lactation

No information is available on the use of omadacycline during breastfeeding. It is unknown how much omadacycline is excreted into breastmilk, but the drug is only about 35% absorbed orally under optimal circumstances, and is probably less from milk because of its calcium content. Although the manufacturer recommends avoiding breastfeeding during administration of omadacycline and for 4 days after the last dose, short-term use of omadacycline is probably acceptable in nursing mothers. If an infant is breastfed, monitor the infant for possible effects on the gastrointestinal flora, such as diarrhea, candidiasis (e.g., thrush, diaper rash) or rarely, blood in the stool indicating possible antibiotic-associated colitis. As a theoretical precaution, avoid prolonged or repeat courses during nursing.

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.

Substance Identification

Substance Name

Omadacycline

CAS Registry Number

389139-89-3

Drug Class

Breast Feeding

Lactation

Milk, Human

Anti-Infective Agents

Antibacterial Agents

Tetracyclines

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: NBK535602PMID: 30601611

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