Mounjaro and Pregnancy: Safety, Timing, and What to Discuss With Your Doctor

Mounjaro is a prescription-only, once-weekly injectable medicine containing tirzepatide, a dual GIP and GLP-1 receptor agonist. According to the product information held in the electronic Medicines Compendium (eMC), tirzepatide is not recommended during pregnancy. This is because there is insufficient data on its use in pregnant people to establish safety for the developing baby, and animal studies have raised concerns that warrant caution.

If you become pregnant while taking Mounjaro

If you discover you are pregnant while using Mounjaro, contact your prescriber or doctor promptly. They will advise on whether to discontinue treatment and will support you with alternative approaches to managing your health during pregnancy. This is not a decision to make independently — your prescriber knows your full medical history and is best placed to guide you.

Does Mounjaro affect contraception or fertility?

Some people ask whether Mounjaro or similar medicines interfere with contraception or fertility. For information on how Mounjaro may interact with fertility considerations, see the dedicated page on how Mounjaro may affect fertility. It is worth noting that GLP-1 medicines can slow gastric emptying, which may in theory affect the absorption of oral medications — something worth raising with your prescriber if you take oral contraceptives. A similar question arises with Wegovy (semaglutide) and pregnancy, and the same principle applies: use during pregnancy is not recommended, and any questions should go to your healthcare professional.

Weight loss during pregnancy: a separate question

Intentional weight loss during pregnancy is generally not recommended, as the body has increased nutritional demands to support fetal development. Whether any degree of weight change is safe for you personally during pregnancy is something only your prescriber or doctor can assess based on your individual circumstances. GLP Trackr does not provide medical guidance on this — your healthcare team does.

After pregnancy: returning to Mounjaro

Some people search for information about using Mounjaro after pregnancy or during breastfeeding. Current guidance advises against use while breastfeeding, as it is not known whether tirzepatide passes into breast milk. Any decision about restarting Mounjaro following pregnancy or after breastfeeding has ended should be made in discussion with your prescriber, not independently. For context on how safety considerations are assessed for a related medicine, you may find it useful to read about how Wegovy's safety profile is evaluated, as both medicines share similar classes of consideration.

GLP Trackr is a tracking and journaling app — it does not provide medical advice and is not a substitute for your prescriber's guidance, particularly on a topic as important as pregnancy. What it can do is help you stay organised and informed throughout your GLP-1 journey at the times when you are using the medicine under your prescriber's direction.

Logging side effects and symptoms to share with your doctor

One of the most useful features during any stage of your treatment is the side-effect tracker. If you are in a phase of treatment — for example, after pregnancy when your prescriber has restarted Mounjaro — logging how you feel each day creates a clear, dated record you can bring to appointments. Rather than trying to recall weeks of symptoms from memory, you have a timeline to discuss. You can also log mood, energy, and sleep through the daily check-in, which many people find valuable when navigating the physical and emotional demands of the postnatal period.

For broader context on how tirzepatide works in the body, the page on how Mounjaro works covers its mechanism in plain language.

Tracking weight and progress after pregnancy

For people who restart Mounjaro after pregnancy and are focusing on weight management, GLP Trackr's weight and body tracking tools — including weekly progress charts and measurement logging — help you see the full picture of your journey, not just the number on the scale.

Important: if you are pregnant, think you may be pregnant, or are breastfeeding, please contact your prescriber or doctor before making any decision about Mounjaro. Any symptoms that are severe, persistent, or concern you should be discussed with a healthcare professional promptly. GLP Trackr helps you record information to support those conversations — it is not a replacement for them.

If your prescriber has cleared you to use Mounjaro and you want a simple way to track your journey — logging how you feel, monitoring your progress, and keeping a clear record for appointments — GLP Trackr is free to try for 7 days. Download it on the App Store or Google Play and see how it fits into your routine.