Why Mounjaro Is Not Recommended While Breastfeeding
According to the electronic Medicines Compendium (eMC) product information for Mounjaro, use during breastfeeding is not recommended because it is not known whether tirzepatide is excreted in human breast milk, and a risk to the nursing infant cannot be ruled out. The same caution applies to using Mounjaro while breastfeeding at any stage of a feeding journey.
Semaglutide-based medicines such as Wegovy carry similar restrictions, and the underlying reason is consistent across this class of medicines: the absence of safety data in breastfeeding people means prescribers are advised to err on the side of caution.
What this means in practice
If you were prescribed Mounjaro before becoming a parent and are now breastfeeding, your prescriber or doctor is the right person to advise whether to pause treatment, continue, or explore other options. That decision depends on your individual health history, your reasons for treatment, and your feeding plans — factors only your clinical team can weigh properly.
Breastfeeding itself is associated with gradual, natural changes in body weight for many people, and general guidance around nourishing food, hydration, and activity remains relevant during this period. However, deliberate calorie restriction during breastfeeding is generally approached with caution, since energy needs are typically higher when nursing. Your prescriber or doctor can help you understand what weight-management approach is appropriate for your situation.
For broader context on how Mounjaro works and what it is used for, see our Mounjaro information hub.
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GLP Trackr does not provide medical advice, and nothing in this article should replace the guidance of your own healthcare professional. Any decision about whether to use, pause, or restart Mounjaro while breastfeeding must be made with your prescriber — they know your full picture. If you have concerns about symptoms or your health at any point, contact your healthcare professional promptly.
You may also find it helpful to read about Mounjaro and other hormonal health considerations as part of understanding your broader health context.
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Frequently asked questions.
Current product guidance advises against using Mounjaro (tirzepatide) while breastfeeding, as it is not known whether the medicine passes into breast milk. Speak with your prescriber or doctor before continuing or starting treatment if you are nursing.
Yes. Wegovy (semaglutide) carries similar restrictions during breastfeeding, as safety data for nursing infants is insufficient. Both medicines are prescription-only, and suitability during breastfeeding is a decision for your prescriber or doctor.
Breastfeeding increases energy needs, so significant calorie restriction is generally approached with caution during this period. For personalised guidance on weight management while nursing, talk to your prescriber or a registered healthcare professional.
Contact your prescriber or doctor to discuss your options. They can advise whether to pause treatment, adjust your plan, or explore alternatives based on your individual health history and circumstances. Do not make dose changes without their guidance.
GLP Trackr lets you log wellbeing, mood, food intake, and weight during a treatment break, so you have a clear record to discuss with your prescriber when reviewing your care. The app supports tracking; it does not provide medical advice.