Respiratory distress furosemide

Pregnancy Category B (ethacrynic acid, torsemide) Category C (furosemide, bumetanide). Since furosemide may increase the incidence of patent ductus arteriosus in preterm infants with respiratory-distress syndrome, use caution when administering before delivery. 

Green TP, Johnson DE, Bass JL, Landrum BG, Ferrara TB, Thompson TR. Prophylactic furosemide in severe respiratory distress syndrome blinded prospective study. J Pediatr 1988 112(4) 605-12. 

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