Methylene blue-induced hyperbilirubinemia in neonatal glucose-6-phosphate dehydrogenase (G6PD) deficiency.

Methylene blue continues to be used in the gravid female. We report three premature neonates exposed to methylene blue that experienced severe hemolytic reactions requiring exchange transfusions. Two neonates were subsequently diagnosed with G6PD deficiency. Continued caution is warranted prior to the use of methylene blue in the gravid female.