I think very little information is available about this medication.
However, it probably has a long half life.  Nevertheless, the amount
the baby would probably get through the milk is very small, and
unlikely to be clinically significant, if it acts as most drugs.  This
drug probably has a very large volume of distribution, which means
that the blood levels are probably very low, but that some will remain
in the body for a long time after the mother stops taking it.

It is conceivable that the baby could have an unpleasant reaction if
the mother does take alcohol. It would be imperative she not take
alcohol.

This baby is at high risk of all sorts of things from not
breastfeeding, just from the social situation.  I would encourage
breastfeeding *and get some data on what happens to the drug in the
milk and in the baby*.  Here's a paper for you.

Jack Newman, MD, FRCPC