Everything You Need To Know About Mounjaro During Pregnancy

Summary

• It is not recommended to take Mounjaro (tirzepatide) if you are pregnant or when you are trying to conceive.
• Make sure that you are using a reliable contraception while you are undergoing Mounjaro, most especially taking oral contraceptives. According to MHRA, it is advisable to have extra backup methods.
• You need to stop taking Mounjaro for at least a month before your planned pregnancy.

What You Will Learn

By the end of the article, you will be able to learn the following:

• You will learn to understand how Mounjaro works and what it is all about.
• You will learn how to be aware of your safety in pregnancy and breastfeeding in relation to Mounjaro.
• You will learn to recognise the different possible risks, fertility implications, and interactions with contraception.
• You will learn about the different practical steps such as knowing when to stop, what are the safer alternatives, and you can discuss options with your healthcare professionals.

Read more: How Long Does Mounjaro Take to Work? A Comprehensive Guide to Expectations

What You Need To Know About Mounjaro

It is a medication that works by mimicking two natural gut hormones which are GLP-1 and GIP. This dual-action effect makes it highly efficient in lowering blood sugar and reducing body weight through the slowing down of digestion and sending signals to the brain to make you feel full. In the UK, Mounjaro is licensed in treating Type 2 Diabetes and for treating Chronic Weight Management for adults with a high BMI and have weight-related health conditions.

Mounjaro is also classified as a Prescription-Only Medicine POM in the UK. It means that it should be initiated by a healthcare professional only after a thorough clinical assessment. As of 2026, it is still under the “additional monitoring”. It means that this allows regulatory bodies like the MHRA in closely tracking any new or possible rare side effects as the medication becomes more widely used in the market.

Read more: Everything You Need To Know About Mounjaro As A First-Time User

The Relationship of Mounjaro and Pregnancy: What Are The Key Considerations

Pregnancy will naturally change the process of how the body works and it can also significantly change how a woman’s body processes future medication. This is because Mounjaro affects the insulin levels and nutrient absorption of your body. Therefore, there are various concerns that could possibly affect the delicate hormonal balance that is required in sustaining a healthy pregnancy. Furthermore, Mounjaro’s primary function is actually to lose weight loss and it is not generally not recommended during pregnancy. This is because the developing foetus will require a steady and increasing supply of calories and nutrients which might greatly affect if considered to take Monjaro during pregnancy.

However, up to date, there is still limited study about it because traditionally, pregnant women are typically excluded from clinical trials.

In laboratory studies, it usually involves pregnant rats and rabbits, which high doses of tirzepatide were linked to in order to lower fetal body weight and its structural abnormalities.

Up to date, experts do not have any large-scale human data yet in confirming if these risks would actually translate directly into humans.

The Effects of Mounjaro on Pregnancy

The primary concern of this is developmental toxicity. It happens when the mounjaro crosses the placenta and its effect on growth hormones which could potentially lead to the following:

There might be some growth restrictions. This happens when the foetus might not gain weight at a standard healthy rate.

There could be some congenital abnormalities. However, while there is no confirmed effect in humans yet, the data from the animal testing suggests that there is a potential risk for skeletal or organ malformations if it is exposed during the foetus’ critical development windows.

For the mothers, when you choose to stay or undertake Mounjaro while you are pregnant, you might experience several clinical challenges such as:

Malnutrition: You might experience severe nausea and a lack of appetite which could prevent you from consuming the essential vitamins like folic acid and other calories that your baby needs.

Blood Sugar Instability: For individuals dealing with diabetes, the pregnancy itself is already making the blood sugar harder to control. It is why using a strong medication like Mounjaro could possibly lead to dangerous hypoglycemia or having low blood sugar if it is not managed appropriately.

What Are The Mounjaro Pregnancy Risks

One of the most critical risks that you need to understand in 2026 in relation to pregnancy to Mounjaro is that it can make oral contraceptives less effective than its standard purpose. The reason behind this is that it works by slowing down how fast your stomach empties which birth control pills might not be able to absorb it properly into your bloodstream enough to work reliably. This is more visible and seen when you are just starting the medication or every time that you increase your dose. To make sure of your safety and the safety of your child, some doctors recommend switching to non-oral methods such as IUD, implant, or injection. It could also help to add a backup barrier method like condom for at least four weeks after every dose adjustment needed.

Because Mounjaro works by staying in your system for a long period of time, you cannot simply stop the effect of its medication on the day you decide to try to conceive a child. The current standard clinical guidance is to stop taking Mounjaro for at least 2 months or 8 weeks before you decide to stop using any contraception. In this washout period, it fully ensures that the medication is completely out of your system before any pregnancy attempt begins. This is also to protect the foetus during the most sensitive early stages of human development.

How Mounjaro Affects Fertility

For the majority of women, Mounjaro might actually help in increasing their fertility indirectly. Health conditions like Polycystic Ovary Syndrome (PCOS) are typically linked to insulin resistance and weight. When it improves your insulin sensitivity and helps with weight loss, it can also help resetting your hormonal balance. This often leads to a more regulated ovulation. This is why the majority of women who typically struggled in conceiving would often find themselves having surprise pregnancies while they are taking the medication.

While yes there is a metabolic boost, there are still a lot of studies needed to ensure the safety of Mounjaro in relation to pregnancy. Clinical experts still do not have any long-term studies yet on how Mounjaro actually affects the egg quality or the lining of the uterus. Because Mounjaro is such a powerful medication, there is a significant concern that the rapid weight loss in the early stages of the pregnancy could possibly stress the mother’s reproductive system.

How To Navigate Pregnancy with Mounjaro

The only medical advice you need in this matter is this: You should not take it during your pregnancy or stop taking Mounjaro during your pregnancy. If you have discovered that you are pregnant while you are under medication, the first thing you need to do is immediately stop any injections and contact your healthcare provider right away. Your doctor will most likely perform an early scanning and monitoring of your pregnancy closely. However, in usual scenarios, the risk of it to the baby is typically considered lower if the medication is immediately stopped as soon as you confirm that you are pregnant.

Conclusion

Mounjaro is still quite new in the market that’s why the 2026 medical guidelines from the NHS and MHRA are very cautious about its proper usage during pregnancy. Clinical experts strongly advise mothers to stop taking Mounjaro if they are pregnant, breastfeeding, or even planning to conceive a child in the near future. The reason is because there isn’t enough human data and study yet that could prove that it’s safe to use. What the experts have right now are data coming from animal studies which have shown that it could potentially cause low birth weight or structural issues for the development of the baby. If you are already taking Mounjaro and recently found out that you are pregnant, you need to stop it immediately and consult your doctor. They will tell you the next steps that you need to take and make sure to tell them everything that you might be feeling during that period so they could also be informed.