It is possible that chlorpromazine might cause some sleepiness in the
baby, but not in the usual doses of chlorpromazine used to increase milk
supply.  It is not contraindicated for nursing mothers.  The baby will
get some though.

It is a dopamine antagonist, like metoclopramide (Reglan) and
domperidone (Motilium), but with more side effects for the mother.

Jack Newman, MD, FRCPC (Just back from New Hampshire where there is
still snow in the shade of farm houses).