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Drugs and Lactation Database (LactMed) [Internet]. Bethesda (MD): National Library of Medicine (US); 2006-.

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Drugs and Lactation Database (LactMed) [Internet].

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Cloxacillin

Last Revision: January 18, 2021.

Estimated reading time: 1 minute

CASRN: 61-72-3

image 134971202 in the ncbi pubchem database

Drug Levels and Effects

Summary of Use during Lactation

Limited information indicates that cloxacillin produces low levels in milk that are not expected to cause adverse effects in breastfed infants. Occasionally disruption of the infant's gastrointestinal flora, resulting in diarrhea or thrush have been reported with penicillins, but these effects have not been adequately evaluated. Cloxacillin is acceptable in nursing mothers.

Drug Levels

Maternal Levels. No studies have reported milk levels after oral cloxacillin. After a single intramuscular dose of 500 mg of cloxacillin in 2 women, milk levels ranged from 0.1 to 0.3 mg/L between 1 and 6 hours after the dose.[1]

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

Effects in Breastfed Infants

In a telephone follow-up study, 10 nursing mothers reported taking cloxacillin (dosage unspecified). Two mothers reported diarrhea in their infants. No rashes or candidiasis were reported among the exposed infants.[2]

Effects on Lactation and Breastmilk

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

Alternate Drugs to Consider

(Mastitis) Cephalexin; (Methicillin-resistant Staph. aureus) Doxycycline, Linezolid, Minocycline, Trimethoprim-Sulfamethoxazole, Vancomycin

References

1.
Matsuda S. Transfer of antibiotics into maternal milk. Biol Res Pregnancy. 1984;5:57-60.. [PubMed: 6743732]
2.
Ito S, Blajchman A, Stephenson M, et al. Prospective follow-up of adverse reactions in breast-fed infants exposed to maternal medication. Am J Obstet Gynecol. 1993;168:1393–9. [PubMed: 8498418]

Substance Identification

Substance Name

Cloxacillin

CAS Registry Number

61-72-3

Drug Class

Breast Feeding

Lactation

Anti-Infective Agents

Antibacterial Agents

Penicillins

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.

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