Can you take Zepbound while breastfeeding?

As GLP-1 medications become more popular for weight loss, many new parents are curious whether they can start (or restart) treatment while nursing. But can you take Zepbound (tirzepatide) while breastfeeding?

There is no clear answer yet. Because Zepbound is still relatively new, researchers do not have enough data to know exactly how the medication affects breastfed babies. The decision to use Zepbound while breastfeeding should be made with a healthcare provider, weighing the benefits of breastfeeding against the need for the medication. Many healthcare providers may recommend waiting until breastfeeding is complete before starting it.

Here's what the research says so far about Zepbound while breastfeeding, whether tirzepatide passes into breast milk, and what to consider if you're trying to manage your weight after having a baby.

Right now, the honest answer is: it depends. Zepbound (tirzepatide) hasn't been well studied during breastfeeding, so there isn't enough research to confirm whether it's safe for nursing infants. Researchers are still working to understand whether tirzepatide passes into breast milk and whether it could affect a nursing infant. 

One small study did find that tirzepatide was undetectable in most breast milk samples after a single dose, and the tiny amounts found in a few samples were less than 0.02% of the mother’s dose. However, there are no data on whether this could affect a breastfed infant or milk production. 

Zepbound side effects are also something to consider when it comes to breastfeeding. Nausea, vomiting, diarrhea, and reduced appetite can make it harder for some people to get enough calories, fluids, and nutrients during a time when the body’s demands are already high. 

Because the research is still limited, the decision to use Zepbound while breastfeeding should be made with your healthcare provider, who can help you weigh the potential risks and benefits based on your situation. Many healthcare providers may recommend waiting until you’ve finished breastfeeding before starting Zepbound because of the limited safety data. 

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Based on limited evidence, very little tirzepatide appears to pass into breast milk. In a clinical lactation study included in the updated Zepbound prescribing information, tirzepatide was either undetectable or nearly undetectable in 171 breast milk samples tested from 11 lactating women after they received a single 5 mg dose of tirzepatide. Similar findings were seen for semaglutide.

One reason experts are cautiously optimistic is the size of the medication itself. Tirzepatide is a large protein molecule, which makes it less likely to transfer into breast milk in significant amounts. Even if small amounts do enter milk, they would likely be broken down in a baby's digestive tract rather than absorbed into their bloodstream.

These findings are reassuring, but they do not provide a definitive answer for all situations. This was a single-dose study at the lowest therapeutic dose (5 mg), and there are still no data on the effects of tirzepatide on breastfed infants or on milk production. Larger studies with repeated dosing are still needed to fully understand whether Zepbound is safe to use while breastfeeding.

We don't know yet. While there's currently no data that Zepbound lowers milk supply, the reality is that researchers simply haven't studied the question enough to know for sure.

However, some experts have raised questions about whether the medication could indirectly affect supply in certain situations.

For example, Zepbound often reduces appetite and can lead to significant weight loss, while breastfeeding increases your body's calorie and nutrient needs. If you're eating substantially less than your body requires, it may become harder to support milk production.

The medication's side effects could also play a role. If nausea, vomiting, diarrhea, or a reduced appetite make it difficult to stay nourished and hydrated, that may affect breastfeeding for some people.

Ultimately, if you're breastfeeding and considering Zepbound, your healthcare provider can help you weigh the potential benefits and unknowns based on your health history, weight-loss goals, and daily nutrition habits.

If you're breastfeeding and waiting to start Zepbound, that doesn't mean weight management has to be put on hold entirely. The postpartum period comes with its own unique challenges, and healthy weight loss often looks different than it did before pregnancy.

Rather than focusing on rapid results, experts generally recommend supporting your body's recovery, meeting your nutritional needs, and building sustainable habits that can carry you through the demands of new parenthood. Here’s what to keep in mind.

Focus on nourishing, balanced meals

Breastfeeding increases your body's energy needs, so this isn't the time for highly restrictive eating patterns. Instead, focus on eating regular meals that include a balance of protein, fiber-rich carbohydrates, healthy fats, and fruits and vegetables.

Protein and fiber can be especially helpful for managing hunger and supporting satiety, while nutrient-dense foods help replenish the vitamins and minerals your body needs during recovery.

Ease back into physical activity

Once you feel ready, gradually increasing your activity level can support both physical and mental well-being.

That doesn't have to mean jumping straight into intense workouts. Walking, strength training, postpartum exercise classes, and other forms of movement you genuinely enjoy can all help support long-term weight management.

Prioritize sleep when possible

New parents hear this advice all the time — and for good reason. Poor sleep is linked to changes in appetite-regulating hormones, increased hunger, and greater cravings for calorie-dense foods.

Of course, uninterrupted sleep isn't always realistic with a newborn. But getting help when possible, resting when you can, and prioritizing sleep as much as your situation allows may support your overall health and weight loss efforts.

Work with your healthcare provider

Postpartum weight changes are highly individual. Factors like breastfeeding, hormone fluctuations, sleep deprivation, stress, medications, and underlying health conditions can all influence how quickly weight comes off after pregnancy.

If you're concerned about your weight or interested in medications like Zepbound down the road, your healthcare provider can help you create a plan that fits your goals, timeline, and overall health needs.

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While the research on Zepbound and breastfeeding is evolving, there are still more questions than answers. Until researchers know more about how tirzepatide affects breast milk and nursing infants, healthcare providers may recommend a cautious approach — though a healthcare provider can help weigh the risks and benefits based on individual health needs.

• Zepbound has limited data during breastfeeding. There are no data on its effects on the breastfed infant or on milk production. While many healthcare providers may recommend caution, a discussion with a healthcare provider can help weigh the risks and benefits of starting it while nursing.

• There is currently no data that Zepbound affects milk supply, but the medication's appetite-suppressing effects and gastrointestinal side effects may make breastfeeding more challenging for some people.

• If you're breastfeeding and hoping to lose weight, focusing on nutrition, physical activity, sleep, and overall postpartum recovery can help support your goals until more safety data become available.

• If you're considering Zepbound after having a baby, talk with your healthcare provider about the timing that's right for you.