Can you take inotuzumab ozogamicin while breastfeeding?
What LactMed says
The National Library of Medicine’s own summary, quoted in full. We do not write a verdict of our own on this question, and we do not compress theirs into a label.
No information is available on the clinical use of inotuzumab ozogamicin during breastfeeding. Because inotuzumab is a large protein molecule with a molecular weight of 168,000 Da the amount in milk is likely to be very low. It is also likely to be partially destroyed in the infant's gastrointestinal tract and absorption by the infant is probably minimal. Ozogamicin (N-acetyl gamma calicheamicin) is a small-molecule that causes double-stranded DNA that might enter milk and be absorbed by the infant. Because of the potential for serious adverse reactions in the breastfed infant, the manufacturer recommends that breastfeeding be discontinued during inotuzumab ozogamicin therapy for at least 2 months after the last dose.
Quoted from Inotuzumab Ozogamicin — Drugs and Lactation Database (LactMed®), National Institute of Child Health and Human Development, revised January 15, 2025.
How much inotuzumab ozogamicin gets into breastmilk
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.
What has been seen in breastfed infants
Relevant published information was not found as of the revision date.
Effects on milk supply
Relevant published information was not found as of the revision date.
Frequently asked questions
Can you take inotuzumab ozogamicin while breastfeeding?
No information is available on the clinical use of inotuzumab ozogamicin during breastfeeding. The full record is quoted on this page, and the decision is one to make with the person who prescribed it — LactMed itself states it is not a substitute for professional judgement.
Does inotuzumab ozogamicin pass into breastmilk?
LactMed's measured drug levels for inotuzumab ozogamicin are quoted in full on this page, under "How much gets into breastmilk".
Do I need to pump and dump after taking inotuzumab ozogamicin?
LactMed does not frame its records that way — it reports measured drug levels in milk and what has been observed in breastfed infants, which is what this page quotes. "Pump and dump" advice for a specific drug and dose should come from your clinician or a pharmacist, not from a general rule.
More on inotuzumab ozogamicin
LactMed states that the information it presents is not a substitute for professional judgement, and that you should consult your healthcare provider for breastfeeding advice related to your particular situation. Nothing on this page is medical advice.