Preeclampsia and eclampsia are hypertensive disorders of pregnancy best treated by an anticonvulsive called magnesium sulfate (MgSO4).  While the use of this compound (in injectable form) is not an 'innovation,' it is underutilized because providers are undertrained, protocols don't cover it, and it is unavailable in some countries.  It is a very low-cost drug--and the innovation will lie in novel campaigns, training and potentially packaging & distribution.