<prompt> Drug that is used for fetal lung maturity isDexamethasoneFolic acideclomethasoneone  <response>: Betamethasone and dexamethasone are coicosteroids, also called glucocoicoids, that are given before bih antenatally to speed up a preterm fetuses lung development. Either is used when a mother is in preterm labor and bih may occur in 24 to 48 hours REF : DUTTA BOOK OF OBESTETRICS 