Clomiphene (Clomid) is not contraindicated during breastfeeding, but it
could cause the milk to "dry up". I have had a few mothers far along that
did not seem to be affected by it, when it was taken far along, as in this
case, but it could, at least in theory, decrease the milk supply
considerably.
The half life has nothing to do with it.
Jack Newman, MD, FRCPC