Can You Take Mounjaro When Pregnant?

What official guidance actually says, and why it's firm

The Mounjaro Summary of Product Characteristics, published on the electronic Medicines Compendium, states explicitly that tirzepatide should not be used during pregnancy. This isn't a precautionary hedge pending future data; it reflects findings from reproductive toxicology studies in animals where tirzepatide was associated with reduced foetal growth and embryo loss at exposures comparable to therapeutic human doses. Because the mechanism of action affects nutrient uptake and energy balance at a fundamental level, regulators take the risk seriously. There are, at this point, no controlled human studies in pregnant women, and running such a trial would not be ethical. The NHS guidance on tirzepatide is consistent with this position: the medicine is not suitable during pregnancy.

The MHRA and NHS England's weight-management-injections guidance both advise that women who could become pregnant should use reliable contraception throughout treatment. For tirzepatide specifically, there is a further practical consideration: the medicine slows gastric emptying, which can reduce how well oral contraceptive pills are absorbed. That's why clinical guidance recommends adding a non-oral method, such as condoms, for the first four weeks of treatment and for four weeks after every dose increase. If you have questions about contraception on Mounjaro, our clinical team can discuss this as part of your consultation.

What this means if you're pregnant right now

If you discovered your pregnancy while already taking Mounjaro, you may be feeling anxious, and that's completely understandable. The guidance is clear, but a single exposure before you knew is a different situation from continuing throughout a pregnancy. Stop taking Mounjaro immediately and tell your GP or midwife as soon as possible. They will arrange appropriate monitoring and can advise on whether any specific follow-up is needed based on how far along you are and how long you were taking the medicine.

Do not try to restart Mounjaro, switch to a different dose, or manage weight during pregnancy without direct clinical input. Weight management approaches in pregnancy are supervised differently, and the priorities shift entirely. The NHS England guidance on weight-management injections specifically identifies pregnancy as a situation requiring immediate clinical review. A question our prescribers hear regularly is whether you can use Mounjaro when pregnant, and the answer, based on current evidence and licensing, is no. There is no dose of tirzepatide that is approved for use in pregnancy.

Planning ahead: stopping Mounjaro before trying to conceive

If you're not currently pregnant but you're planning to try to conceive, this is the right time to have that conversation with your prescriber or GP. The recommended practice is to stop Mounjaro before attempting pregnancy, and to allow a wash-out period. The prescriber authorising your treatment should give you a specific timeline, since it depends on your dose and clinical picture, this is not something to estimate from a general guide. Our dedicated page on taking Mounjaro when pregnant covers the key considerations around timing and what to discuss with your prescriber before you start trying to conceive. You can find more detail on how Mounjaro relates to pregnancy, including guidance on planning around treatment, in our dedicated overview.

Weight management before and during pregnancy is genuinely important for both maternal and foetal health, and stopping Mounjaro doesn't mean losing all the progress you've made. Many people find that the dietary habits and reduced appetite patterns they developed on treatment carry forward. Your GP or a registered dietitian can help you maintain those gains safely. If you want to understand your options for weight management after pregnancy and the postnatal period, our weight-loss treatment overview explains what's available once it's clinically safe to consider resuming.

Breastfeeding, and returning to treatment after pregnancy

Mounjaro is also not recommended during breastfeeding. Tirzepatide has not been studied in breastfeeding women, and it is not known whether it passes into breast milk or what effect it might have on a nursing infant. If you are wondering whether you can have Mounjaro when pregnant or while nursing, the precautionary position is that treatment should not be used until breastfeeding has ended and your prescriber has confirmed it is appropriate to restart. The NHS tirzepatide medicines page covers this clearly alongside the pregnancy caution.

Once you are no longer pregnant or breastfeeding, returning to Mounjaro (or starting it for the first time) is something a prescriber can assess. Many patients also ask whether it is safe to take Mounjaro while pregnant, and our prescribers can talk through the evidence and your individual circumstances in a consultation. At nume, every consultation is reviewed by a GPhC-registered Independent Prescriber, and they consider your full picture before any treatment is approved. There are no shortcuts in that process, but there's also no waiting list. If you'd like to explore your options when the time is right, you can start a free consultation and a real clinician will review it the same day. In the meantime, if you have questions specific to your situation, our team is available via our support page seven days a week.