Can I take dipyridamole while pregnant or breastfeeding?
A plain-words look at what the NHS, the US drug label and LactMed say about dipyridamole.
In short
Pregnancy: Dipyridamole is not often used in pregnancy, because little is known about how it may affect your baby.
Breastfeeding: You may be able to take dipyridamole during breastfeeding if your doctor, midwife or health visitor tells you your baby is healthy. However, speak to your doctor or a pharmacist before taking it.
Your doctor, midwife or pharmacist can help you decide.
What this means for you
Pregnancy
- Even so, your doctor may suggest you take it if they believe the benefits are greater than the risks.
- If you're pregnant or trying for a baby, ask your doctor to go through the benefits and possible harms of dipyridamole.
- These depend on how far along your pregnancy is and why you need the medicine.
- Other medicines may suit you better while you're pregnant.
Breastfeeding
- You may be able to take dipyridamole during breastfeeding if your doctor, midwife or health visitor tells you your baby is healthy.
- However, speak to your doctor or a pharmacist before taking it.
- The amount of dipyridamole that reaches breast milk is not known, but it's probably small.
- It's unlikely to give your baby side effects.
- This includes diarrhoea or vomiting (being sick), irritability, bruising or bleeding easily, and skin rashes.
When to get help
- As a precaution, call 111 (NHS 111 in the UK) or speak to your doctor, midwife or health visitor if anything about your baby worries you.
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
Dipyridamole in pregnancy
The NHS says
Dipyridamole is not often used in pregnancy, because little is known about how it may affect your baby. Even so, your doctor may suggest you take it if they believe the benefits are greater than the risks.
If you're pregnant or trying for a baby, ask your doctor to go through the benefits and possible harms of dipyridamole. These depend on how far along your pregnancy is and why you need the medicine.
Other medicines may suit you better while you're pregnant.
In our words, from the NHS page Dipyridamole (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
Pregnancy Teratogenic Effects: PREGNANCY CATEGORY B Reproduction studies have been performed in mice, rabbits and rats at oral dipyridamole doses of up to 125 mg/kg, 40 mg/kg and 1000 mg/kg, respectively (about 1 1/2 , 2 and 25 times the maximum recommended daily human oral dose, respectively, on a mg/m 2 basis) and have revealed no evidence of harm to the fetus due to dipyridamole. There are, however, no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, dipyridamole tablets should be used during pregnancy only if clearly needed.
Prescribing label, section “Pregnancy”: Dipyridamole (oral), REMEDYREPACK INC. Label on DailyMed. Quoted verbatim; US labels are written for US prescribers and patients.
Dipyridamole while breastfeeding
The NHS says
You may be able to take dipyridamole during breastfeeding if your doctor, midwife or health visitor tells you your baby is healthy. However, speak to your doctor or a pharmacist before taking it.
The amount of dipyridamole that reaches breast milk is not known, but it's probably small. It's unlikely to give your baby side effects.
As a precaution, call 111 (NHS 111 in the UK) or speak to your doctor, midwife or health visitor if anything about your baby worries you. This includes diarrhoea or vomiting (being sick), irritability, bruising or bleeding easily, and skin rashes.
In our words, from the NHS page Dipyridamole (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
No published information is available on the use of dipyridamole during breastfeeding, although labeling states that the drug is excreted into human milk. Until more data become available, dipyridamole should be used with caution during breastfeeding, especially while nursing a newborn or preterm infant. If it is used by a nursing mother, monitor the infant for bruising and bleeding.
“Summary of Use during Lactation”, LactMed record “Dipyridamole” (LM1484), quoted verbatim. Everything LactMed reports about Dipyridamole while breastfeeding.
The US prescribing label says
Nursing Mothers As dipyridamole is excreted in human milk , caution should be exercised when dipyridamole tablets are administered to a nursing woman.
Prescribing label, section “Nursing Mothers”: Dipyridamole (oral), REMEDYREPACK INC. Label on DailyMed. Quoted verbatim; US labels are written for US prescribers and patients.
Other names
UK brand names (per the NHS): Attia.
Sources
- NHS, Dipyridamole (nhs.uk), page last reviewed 2 July 2024. Paraphrased. Contains public sector information licensed under the Open Government Licence v3.0.
- US drug label: Dipyridamole (oral), REMEDYREPACK INC., human prescription drug, label effective 29 April 2026, set ID 226099e2-70bb-4b9b-bb52-c20fbca2aec5. DailyMed (National Library of Medicine). Public domain; quoted verbatim.
- Drugs and Lactation Database (LactMed), National Institute of Child Health and Human Development (NICHD), via NCBI Bookshelf, record “Dipyridamole” (LM1484), 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.
Sources checked 26 September 2026. How we source and check every page.
Educational summary of named sources, not medical advice.