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Is tetracycline safe during pregnancy?

Answered by MotherToBaby’s teratology specialists, quoted in full — including the questions most pages skip, like whether a father’s exposure matters.

By the pharmaranks editorial teamReviewed against the MotherToBaby fact sheet for tetracycline (OTIS, published via the NIH) sourcesUpdated Jul 21, 2026How we research

The questions people actually ask about tetracycline in pregnancy

Answered by MotherToBaby, the fact sheets written by the Organization of Teratology Information Specialists and published through the NIH. Quoted in full — we do not condense them.

I take tetracycline. Can it make it harder for me to get pregnant?

It is not known if tetracycline can make it harder to get pregnant.

Does taking tetracycline increase the chance of miscarriage?

Miscarriage is common and can occur in any pregnancy for many different reasons. It is not known if using tetracycline can increase the chance of miscarriage. One study looking at filled prescriptions of antibiotics (67 for tetracycline) reported an increased chance of miscarriage. Studies based on filled prescriptions cannot tell if a person took the medication. This makes it hard to know if the study outcomes are related to the medication or other factors.

Does taking tetracycline increase the chance of birth defects?

Every pregnancy starts out with a 3-5% chance of having a birth defect. This is called the background risk. Overall, the available information on tetracycline has not shown an increased chance of birth defects.

Does taking tetracycline in pregnancy increase the chance of other pregnancy-related problems?

If tetracycline is taken after the 4th month of pregnancy, there is a chance for discoloration of the “baby” teeth (baby teeth might be gray or yellowish brown). Although this changes the look of the teeth, it does not seem to change the development of the outer covering, the enamel, or the chance of getting cavities. It is not clear how many babies who are exposed in pregnancy will go on to have tooth staining.

Tetracycline appears to affect the calcification (hardening) of the bones and teeth, and it might also reduce the growth of some bones while the fetus is exposed to the medication. Even though the tooth discoloration is permanent, the bone growth seems to return to usual after tetracycline is stopped.

It has been suggested that tetracycline be avoided after 4 months of pregnancy unless there is a reason for your healthcare provider to prescribe the medication.

Does taking tetracycline in pregnancy affect future behavior or learning for the child?

Studies have not been done to see if tetracycline can increase the chance of behavior or learning issues for the child.

If a male takes tetracycline, could it affect fertility or increase the chance of birth defects?

Studies have not been done to see if tetracycline could affect male fertility (ability to get partner pregnant) or increase the chance of birth defects above the background risk. In general, exposures that fathers or sperm donors have are unlikely to increase risks to a pregnancy. For more information, please see the MotherToBaby fact sheet Paternal Exposures at https://mothertobaby.org/fact-sheets/paternal-exposures-pregnancy/ .

Quoted from MotherToBaby Fact Sheets — Tetracycline, published January 2024. MotherToBaby states its fact sheets should not take the place of medical care and advice from your healthcare providers.

Breastfeeding is a separate question — what LactMed says about tetracycline

This is general reference information, not medical advice. Whether to take any medication in pregnancy is a decision for you and your prescriber; do not start or stop a drug on your own, because an untreated condition can also carry risk.