Is Methylene Blue safe while breastfeeding?
Here is what NIH LactMed, the U.S. National Library of Medicine's authority on medicines and breastfeeding, reports about Methylene Blue. This is a summary of that source — not our own verdict.
Effects on the breastfed infant
In an old study, 150 mg of methylene blue was given (presumably intravenously) to nursing mothers on several occasions. The presence of the blue dye was verified in the urine, which it colored intensely. No bluish tint was observed in the milk, indicating that methylene blue was not excreted unchanged. During the day of ingestion and the following four days, the chromogen was sought in the milk using the usual method (acidification with acetic acid, boiling, centrifugation, and examination of the supernatant liquid). No trace of the chromogen could be detected.[ 1 ]
Effects on milk supply
Relevant published information was not found as of the revision date.
Levels in milk
Maternal Levels. Relevant published information was not found as of the revision date. Infant Levels. Relevant published information was not found as of the revision date.
Source: NIH LactMed (National Library of Medicine).
Educational summary of an authoritative source — not medical advice. Never start, stop, or change a medicine while breastfeeding without confirming with your doctor.