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Mounjaro ® (tirzepatide) injection
2.5 mg/5 mg/7.5 mg/10 mg/12.5 mg/15 mg
This information is provided in response to your request. Resources may contain information about doses, uses, formulations and populations different from product labeling. See Prescribing Information above, if applicable.
Can Mounjaro® (tirzepatide) be used by a breastfeeding mother?
There are no available data on the effects of tirzepatide on the breastfed infant or on milk production.
See important safety information, including boxed warning, in the attached prescribing information.
Mounjaro Use in Lactation
Risk Summary
In a single-dose clinical lactation study, the concentration of tirzepatide in breast milk was found to be either undetectable or low compared to the maternal administered dose. There are no available data on the effects of tirzepatide on the breastfed infant or on milk production. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for MOUNJARO and any potential adverse effects on the breastfed infant from MOUNJARO or from the underlying maternal condition.1
Data
Following subcutaneous administration of a single 5 mg dose to 11 healthy lactating adult females, the concentration of tirzepatide in breast milk was found to be undetectable (limit of detection in breast milk 4 ng/mL) in 164/171 samples assayed. The cumulative amount of tirzepatide detected in the remaining 7 breast milk samples over the 28-day sampling window was equivalent to less than 0.02% of the maternal administered dose, with the last measurable concentrations occurring 5 days post-dose. The area under the curve (AUC) of tirzepatide in breast milk could not be calculated, due to insufficient quantifiable concentrations.1
Enclosed Prescribing Information
Reference
1Mounjaro [package insert]. Indianapolis, IN: Eli Lilly and Company; 2026.
Date of Last Review: January 14, 2026