Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 10/14/2025

Antibiotics Safe for Breastfeeding

Safe First-Line Antibiotics for Breastfeeding Mothers

  • The American Academy of Dermatology suggests that most β-lactam antibiotics, including penicillins and cephalosporins, are considered safe during breastfeeding and should be used as first-line options when appropriate for the infection 1, 2
  • Amoxicillin and amoxicillin/clavulanic acid are explicitly recommended as safe options for breastfeeding mothers requiring antibiotic therapy 2
  • Cephalosporins, like cephalexin, are generally considered safe during breastfeeding 3
  • First-generation cephalosporins are particularly recommended for skin and soft tissue infections in breastfeeding women 3
  • Cephalosporins have minimal transfer to breast milk and limited impact on the nursing infant 1

Other Safe Antibiotics

  • The Journal of the American Academy of Dermatology suggests that metronidazole is safe for breastfeeding patients 4
  • Rifampin can be used in breastfeeding patients with an approach similar to other patient populations 4

Antibiotics to Use with Caution or Avoid

  • Clindamycin should be used with caution as it may increase the risk of GI side effects in the infant 4
  • Tetracyclines, including doxycycline, should be limited to 3 weeks without repeating courses if no suitable alternative is available 1, 4

Clinical Decision-Making Algorithm

  • Penicillins, such as amoxicillin, and cephalosporins, such as cephalexin, are considered first-line options for breastfeeding mothers 1, 2, 3
  • Macrolides, including erythromycin and azithromycin, are suggested as safe options but should be avoided in the first 13 days postpartum if possible 4, 5

Important Considerations

  • Continued breastfeeding during antibiotic treatment is generally recommended and does not pose significant risks to the infant 5
  • The National Institutes of Health's LactMed database is a valuable resource for checking specific antibiotic safety during lactation 1

Safe Antibiotics for Breastfeeding Mothers

Antibiotics to Avoid

  • Fluoroquinolones should not be used as first-line treatment during breastfeeding, as they may pose risks to the infant, according to the Rhinology guideline society 6
  • Tetracyclines should be avoided beyond a 3-week limit, as they may impact infant development, as recommended by the Rhinology guideline society 6
  • Aminoglycosides should not be used during breastfeeding due to potential risks to the infant, as advised by the Rhinology guideline society 6

REFERENCES

1

maternal sepsis review and update. [LINK]

Mayo Clinic Proceedings, 2025

2

Penicillin Safety During Breastfeeding [LINK]

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2025

3

Cephalexin Safety During Breastfeeding [LINK]

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2025

5

First-Line Antibiotics for Mastitis in Breastfeeding Women [LINK]

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2025