Can you take tetracycline while breastfeeding?
What LactMed says
The National Library of Medicine’s own summary, quoted in full. We do not write a verdict of our own on this question, and we do not compress theirs into a label.
A number of reviews have stated that tetracycline is contraindicated during breastfeeding because of possible staining of infants’ dental enamel or bone deposition of tetracyclines. However, a close examination of available literature indicates that there is not likely to be harm in short-term use of tetracycline during lactation because milk levels are low and absorption by the infant is inhibited by the calcium in breastmilk. Although the manufacturer recommends avoiding breastfeeding during administration of tetracycline, short-term use of tetracycline is probably acceptable in nursing mothers. As a theoretical precaution, avoid prolonged or repeat courses during nursing. Monitor the infant for rash and for possible effects on the gastrointestinal flora, such as diarrhea or candidiasis (thrush, diaper rash).
Quoted from Tetracycline — Drugs and Lactation Database (LactMed®), National Institute of Child Health and Human Development, revised June 15, 2025.
What LactMed would consider instead
LactMed ends this record by naming the drugs it would consider in place of tetracycline. Whether any of them fits depends on what you are treating — this is the database’s list, not a recommendation from us.
How much tetracycline gets into breastmilk
Maternal Levels. In a study using a microbiologic assay, milk tetracycline levels were in an unspecified number of nursing mothers at 9 am after various dosages of tetracycline during the previous days. Whether they had mastitis and the time postpartum were not stated. Milk levels increased to 2.5 mg/L after a daily dose of 1 gram orally for 3 days. Milk levels increased to 2 mg/L after a daily dose of 1.5 grams orally for 2 days. Milk levels increased to 2.5 mg/L after a daily dose of 2 grams orally for 3 days.
Five women were given oral tetracycline 500 mg 4 times a day for 3 days. Milk levels ranged from 0.43 to 2.58 mg/L (times not specified).
After a single dose of 150 mg of tetracycline orally in 2 women, milk levels of tetracycline averaged 0.7 mg at 2 and 6 hours after the dose and had an average peak of 0.8 mg/L 4 hours after the dose.
Infant Levels. Five women were given oral tetracycline 500 mg 4 times a day for 3 days. Their infants were allowed to nurse and tetracycline was undetectable (<50 mcg/L) in the infants’ serum.
What has been seen in breastfed infants
No adverse effects were noted in an unspecified number of breastfed infants whose mothers were taking oral tetracycline 1, 1.5 or 2 grams daily for 3 days. Ages of the infants and extent of breastfeeding were not stated. In one study, 5 infants breastfed during maternal therapy with tetracycline 500 mg 4 times daily with no adverse effects observed.
In an observational study of 251 women, 23.8% of nursing mothers received tetracycline during breastfeeding. No gross adverse effect occurred in any of the breastfed infants.
Effects on milk supply
Relevant published information was not found as of the revision date.
Frequently asked questions
Can you take tetracycline while breastfeeding?
What the NIH's Drugs and Lactation Database says about Tetracycline while breastfeeding — quoted in full. The full record is quoted on this page, and the decision is one to make with the person who prescribed it — LactMed itself states it is not a substitute for professional judgement.
What can I take instead of tetracycline while breastfeeding?
LactMed lists Doxycycline as alternate drugs to consider. That is the database's own list for this drug — whether any of them suits you depends on what you are treating.
Does tetracycline pass into breastmilk?
LactMed's measured drug levels for tetracycline are quoted in full on this page, under "How much gets into breastmilk".
Do I need to pump and dump after taking tetracycline?
LactMed does not frame its records that way — it reports measured drug levels in milk and what has been observed in breastfed infants, which is what this page quotes. "Pump and dump" advice for a specific drug and dose should come from your clinician or a pharmacist, not from a general rule.
More on tetracycline
LactMed states that the information it presents is not a substitute for professional judgement, and that you should consult your healthcare provider for breastfeeding advice related to your particular situation. Nothing on this page is medical advice.