Can you take oxytetracycline 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 tetracyclines are contraindicated during breastfeeding because of possible staining of infants’ dental enamel or bone deposition of tetracyclines. However, available literature indicates that there is not likely to be harm in short-term use of oxytetracycline 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 oxytetracycline, short-term use of oxytetracycline 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 Oxytetracycline — 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 oxytetracycline. Whether any of them fits depends on what you are treating — this is the database’s list, not a recommendation from us.
How much oxytetracycline gets into breastmilk
Maternal Levels. In an old study using a microbiologic assay, 5 women in the first week postpartum were given oxytetracycline in dosages ranging from 2 to 4 grams daily in single or divided doses. Oxytetracycline generally did not appear in milk for the first 24 hours. Concentrations then ranged from 0.25 to 1 mg/L until about a day following discontinuation of the drug.
In another old study using a microbiologic assay, milk oxytetracycline levels were in an unspecified number of nursing mothers at 9 am after various dosages of oxytetracycline during the previous days. Whether they had mastitis and the time postpartum were not stated. Milk levels increased to as high as 3 mg/L after a daily dose of 1.5 grams orally for 3 days. Milk levels increased to 3 mg/L after a daily dose of 2 grams orally for 3 days.
Two women were given 1.5 grams daily of oral oxytetracycline. Milk levels ranged from 0.7 to 1.1 mg/L with the peak occurring 7 hours after the dose. The authors estimated that a breastfed infant would receive 300 mcg daily of oxytetracycline in milk.
Infant Levels. Relevant published information was not found as of the revision date.
What has been seen in breastfed infants
No adverse effects were noted in an unspecified number of breastfed infants whose mothers were taking oral oxytetracycline 1.5 or 2 grams daily for 3 days. Ages of the infants and extent of breastfeeding were not stated.
Effects on milk supply
Relevant published information was not found as of the revision date.
Frequently asked questions
Can you take oxytetracycline while breastfeeding?
What the NIH's Drugs and Lactation Database says about Oxytetracycline 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 oxytetracycline while breastfeeding?
LactMed lists Doxycycline, Tetracycline 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 oxytetracycline pass into breastmilk?
LactMed's measured drug levels for oxytetracycline are quoted in full on this page, under "How much gets into breastmilk".
Do I need to pump and dump after taking oxytetracycline?
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 oxytetracycline
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.