Treatments and tests

Pregnancy and breastfeeding while taking warfarin

If you plan to become pregnant or think you are pregnant, you must talk to your doctor about taking warfarin.


Warfarin is not safe to take during pregnancy. It may harm your unborn baby.

If you are able to become pregnant, talk to your doctor about birth control options before you start taking warfarin.

If you plan to become pregnant talk to your doctor who will discuss treatment options.

If you think you are pregnant, contact your doctor.


Current evidence suggests that women may breastfeed while taking warfarin.

Trace amounts of warfarin have been found in breast milk however the amounts are too small to reduce the blood clotting in a baby.

You will need to make sure that your doctor knows that you take warfarin if you intend to breastfeed.

Where to get help


Western Australian Therapeutic Advisory Group | The WA Medication Safety Group

This publication is provided for education and information purposes only. It is not a substitute for professional medical care. Information about a therapy, service, product or treatment does not imply endorsement and is not intended to replace advice from your healthcare professional. Readers should note that over time currency and completeness of the information may change. All users should seek advice from a qualified healthcare professional for a diagnosis and answers to their medical questions.

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