Can you take demeclocycline 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. However, available literature indicates that there is not likely to be harm in short-term use of demeclocycline 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 demeclocycline, short-term use of demeclocycline 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 Demeclocycline — 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 demeclocycline. Whether any of them fits depends on what you are treating — this is the database’s list, not a recommendation from us.
How much demeclocycline gets into breastmilk
Maternal Levels. In 9 women, colostrum levels of demeclocycline ranged from 50 mcg/L to 1 mg/L during a dosage regimen of oral demeclocycline 600 mg daily for 1 to 5 days. Low levels of the drug were detectable in milk for up to 6 days after discontinuation of the drug.
Thirty-six women were studied after receiving oral demeclocycline 300 mg daily for 1 to 9 days after delivery. Demeclocycline was undetectable in milk after a single dose of 300 mg. After repeated doses, milk levels ranged from undetectable to 1.4 mg/L at various times after the dose.
Using the data above, it is estimated that a breastfed infant would receive a maximum of 200 to 300 mcg daily.
Infant Levels. Relevant published information was not found as of the revision date.
What has been seen in breastfed infants
Relevant published information was not found as of the revision date.
Effects on milk supply
Relevant published information was not found as of the revision date.
Frequently asked questions
Can you take demeclocycline while breastfeeding?
What the NIH's Drugs and Lactation Database says about Demeclocycline 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 demeclocycline 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 demeclocycline pass into breastmilk?
LactMed's measured drug levels for demeclocycline are quoted in full on this page, under "How much gets into breastmilk".
Do I need to pump and dump after taking demeclocycline?
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 demeclocycline
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.