This is a homework question, of course, but kind of confused. Not sure what exactly they're going for here. All I can think of is betamethasone for fetal lung maturity and possibly tocylitics to hault premature labor, and maybe RhoGAM for Rh incompatibilities. I've referenced several books now and honestly don't get the question. It's not like there is a medication to treat placenta previa. Thoughts?