Can I take topiramate while pregnant or breastfeeding?

A plain-words look at what the NHS, the US drug label and LactMed say about topiramate.

In short

Pregnancy: Let your doctor know if you're planning a pregnancy, or become pregnant while you're on topiramate.

Breastfeeding: Let your doctor know if you're breastfeeding.

Your doctor, midwife or pharmacist can help you decide.

What this means for you

Pregnancy

Breastfeeding

When to get help

Talk to your doctor or pharmacist

This page is educational, not advice for your own situation. Talk to your doctor, midwife or pharmacist before you start, stop or change any medicine in pregnancy or while breastfeeding.

The details: what each source says

Topiramate in pregnancy

The NHS says

Let your doctor know if you're planning a pregnancy, or become pregnant while you're on topiramate.

Topiramate taken in pregnancy has been linked with a risk of birth defects, so your doctor will usually move you to a different medicine.

They'll usually only suggest staying on topiramate if you have epilepsy and your seizures are not controlled by other epilepsy medicines. If the benefits outweigh the risks, topiramate may be an option for your epilepsy. Your doctor might sometimes want to change you to another medicine.

If you're a woman who needs topiramate for epilepsy, you must use reliable contraception so that you do not become pregnant. Your doctor will advise you about contraception and will review your treatment at least once a year.

In our words, from the NHS page Topiramate (nhs.uk). Contains public sector information licensed under the Open Government Licence v3.0 (OGL v3.0). The NHS does not endorse this site.

The US drug label says

8.1 Pregnancy Pregnancy Exposure Registry There is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to topiramate during pregnancy. Patients should be encouraged to enroll in the North American Antiepileptic Drug (NAAED) Pregnancy Registry if they become pregnant. This registry is collecting information about the safety of antiepileptic drugs during pregnancy. To enroll, patients can call the toll-free number 1-888-233-2334. Information about the North American Drug Pregnancy Registry can be found at http://www.aedpregnancyregistry.org/. Risk Summary Topiramate can cause fetal harm when administered to a pregnant woman. Data from pregnancy registries indicate that infants exposed to topiramate in utero have an increased risk of major congenital malformations, including but not limited to cleft lip and/or cleft palate (oral clefts) and of being small for gestational age (SGA) [see Human Data] . SGA has been observed at all doses and appears to be dose-dependent. The prevalence of SGA is greater in infants of women who received higher doses of topiramate during pregnancy.

Prescribing label, section “8.1 Pregnancy” (opening excerpt): topiramate (oral), REMEDYREPACK INC. Read the full section on DailyMed. Quoted verbatim; US labels are written for US prescribers and patients.

More on topiramate in pregnancy: Bumps (Best Use of Medicines in Pregnancy) leaflet (external site).

Topiramate while breastfeeding

The NHS says

Let your doctor know if you're breastfeeding.

Your doctor will talk it through with you and may advise you to keep taking topiramate if the benefits for you are greater than the risks for your baby.

If you're taking topiramate while breastfeeding and you're worried about your baby, speak to a healthcare professional or call NHS 111 (in the UK).

In our words, from the NHS page Topiramate (nhs.uk). Contains public sector information licensed under the Open Government Licence v3.0 (OGL v3.0). The NHS does not endorse this site.

LactMed says

Maternal doses of topiramate up to 200 mg daily produce low levels in infant serum. Sedation and diarrhea have been reported occasionally in breastfed infants, but most infants tolerate the drug in milk well. In a few infants, no long-term adverse effects on growth and development have been seen. Monitor the infant for diarrhea, drowsiness, irritability, adequate weight gain, and developmental milestones, especially in younger, exclusively breastfed infants and when using combinations of anticonvulsant or psychotropic drugs.

“Summary of Use during Lactation”, LactMed record “Topiramate” (LM390), quoted verbatim. Everything LactMed reports about Topiramate while breastfeeding.

The US prescribing label says

8.2 Lactation Risk Summary Topiramate is excreted in human milk [see Data]. The effects of topiramate on milk production are unknown. Diarrhea and somnolence have been reported in breastfed infants whose mothers receive topiramate treatment. The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for topiramate and any potential adverse effects on the breastfed infant from topiramate or from the underlying maternal condition.

Prescribing label, section “8.2 Lactation” (opening excerpt): topiramate (oral), REMEDYREPACK INC. Read the full section on DailyMed. Quoted verbatim; US labels are written for US prescribers and patients.

Other names

UK brand names (per the NHS): Topamax.

Sources

  1. NHS, Topiramate (nhs.uk), page last reviewed 29 July 2026. Paraphrased. Contains public sector information licensed under the Open Government Licence v3.0.
  2. US drug label: topiramate (oral), REMEDYREPACK INC., human prescription drug, label effective 1 September 2026, set ID 0c0a6774-e234-47a5-866e-462cfd99744c. DailyMed (National Library of Medicine). Public domain; quoted verbatim.
  3. Drugs and Lactation Database (LactMed), National Institute of Child Health and Human Development (NICHD), via NCBI Bookshelf, record “Topiramate” (LM390), bulk release of 22 September 2026. LactMed on NCBI Bookshelf. Public domain; quoted verbatim. LactMed is a registered trademark of the U.S. Department of Health and Human Services.
  4. Bumps (Best Use of Medicines in Pregnancy), UK Teratology Information Service: Bumps (Best Use of Medicines in Pregnancy) leaflet. Linked, not reproduced.

Sources checked 26 September 2026. How we source and check every page.

Educational summary of named sources, not medical advice.