sorry mama-- you may want to check into alternatives--- in a quick search this is what I found--
Regarding the safety of breastfeeding in woman taking a coumarin drug: studies have shown that women on warfarin can safely breastfeed, since only minimal amounts of warfarin are secreted into the breast milk. Phenprocoumon is likely also safe for the breastfeeding women, but less data on this drug exist. I am not aware of any data in the literature for the other coumarins.
In the U.S. the term coumadin is often used by physicians and patients as a generic term for the group of drugs called coumarins, even though that is not really correct. When patients and physicians on this
www.fvleiden.org webpage talk about "coumadin", the information is, in most instances, applicable also to the generic warfarin and to other coumarin drugs.
eta source--
http://www.fvleiden.org/ask/26.html
There is a class of drugs, called Indandiones, which are similar to coumarins and also function as "blood thinners" through vitamin K antagonism, but they are more toxic. They are mostly used in France. To this group belong:
* Phenindione (= Dindevan®, Pindione®)
* Fluindione (= Previscan®)