Mounjaro and Pregnancy: Is Tirzepatide Safe During Pregnancy, Onlinepharmaustralia If you are taking Mounjaro (tirzepatide) and are pregnant, planning to become pregnant, or breastfeeding, it is important to speak with your doctor before continuing treatment.
Mounjaro is not recommended during pregnancy. The Australian Product Information states that tirzepatide should not be used during pregnancy because there are not adequate, well-controlled studies in pregnant women. Animal studies have also identified reproductive and developmental concerns.
The decision about stopping or changing treatment should be made with your healthcare professional. Do not make medication changes without medical advice.
Can you take Mounjaro while pregnant?
No. Mounjaro should not be used during pregnancy.
Tirzepatide has not been adequately studied in pregnant women, so its safety during pregnancy has not been established. The Australian Product Information states that treatment should be discontinued if a patient becomes pregnant.
If you discover that you are pregnant while taking Mounjaro, contact your doctor as soon as possible.
Your doctor can advise you about the appropriate next step based on your individual circumstances.
What should I do if I become pregnant while taking Mounjaro?
If you become pregnant while using Mounjaro, contact your doctor or healthcare professional promptly.
Do not take additional doses until you have discussed the situation with your healthcare professional.
Your doctor will consider factors such as:
- When you became pregnant
- When your last Mounjaro dose was taken
- Your current dose
- Why you were prescribed Mounjaro
- Whether you have type 2 diabetes
- Your other medicines
- Your overall health
If Mounjaro was being used to manage type 2 diabetes, your doctor may need to establish an alternative treatment plan to maintain safe blood glucose levels during pregnancy.
Why is Mounjaro not recommended during pregnancy?
The main reason is that there is not enough human pregnancy data to establish that tirzepatide is safe for an unborn baby.
Animal studies have shown reproductive toxicity when tirzepatide was administered during pregnancy-related studies. The Australian Product Information reports effects including increased pregnancy loss, impaired fetal growth and some fetal abnormalities at maternally toxic doses.
Animal findings cannot be directly translated into the same risk for humans. However, because adequate human safety data are unavailable, tirzepatide should not be used during pregnancy.
Can Mounjaro cause problems for an unborn baby?
It is not possible to determine the exact risk to a human pregnancy because adequate clinical studies are unavailable.
The Australian Product Information reports developmental effects in animal studies and states that a direct effect of tirzepatide on the fetus cannot be excluded.
This is why Mounjaro is not recommended during pregnancy.
If you have accidentally taken Mounjaro before discovering that you were pregnant, do not assume that harm has occurred. Contact your healthcare professional so your individual situation can be assessed.
Can Mounjaro affect fertility?
There is not enough evidence to establish that Mounjaro improves or reduces fertility in humans.
However, significant weight loss can affect reproductive health, and fertility may change as body weight and metabolic health change.
If you are trying to become pregnant, tell your doctor before starting or continuing Mounjaro.
Weight-management treatment should be planned differently when pregnancy is being considered.
What if I am planning to become pregnant?
If you are planning a pregnancy, speak with your doctor before stopping or changing Mounjaro.
Your doctor can help you develop a treatment plan that takes pregnancy into account.
This is particularly important if you have type 2 diabetes because blood glucose management remains important before and during pregnancy.
Do not wait until you have a positive pregnancy test to discuss your medication if you are actively planning pregnancy.
How long should you stop Mounjaro before pregnancy?
The appropriate timing should be discussed with your healthcare professional.
Tirzepatide has a relatively long elimination half-life, and its effects do not disappear immediately after the last injection.
The Australian Product Information should be used alongside individual medical advice when planning treatment cessation and pregnancy.
Because pregnancy planning is individual, there is no reason to use a generic internet schedule instead of discussing your situation with your doctor.
Does Mounjaro affect birth control?
Yes, Mounjaro can affect the reliability of oral hormonal contraception during treatment initiation and dose escalation.
Tirzepatide delays gastric emptying, which can affect the absorption of medicines taken by mouth.
The TGA advises people using oral hormonal contraceptives to switch to a non-oral contraceptive method or add a barrier method for 4 weeks after starting tirzepatide and for 4 weeks after every dose escalation.
This advice is particularly important if avoiding pregnancy is a priority while taking Mounjaro.
Can I take the contraceptive pill with Mounjaro?
The oral contraceptive pill may be affected when you first start Mounjaro and after dose increases.
According to current Australian guidance, people using oral hormonal contraception should either:
- Switch to a non-oral contraceptive method, or
- Add a barrier method such as condoms
for 4 weeks after starting Mounjaro and for 4 weeks following each dose escalation.
Speak with your doctor or pharmacist about the most appropriate contraceptive option for you.
What if I am using Mounjaro for weight loss?
Mounjaro should not be used for weight loss during pregnancy.
Weight loss is not recommended as a treatment goal during pregnancy unless specifically managed for a medical reason by an appropriate healthcare professional.
If you become pregnant while using Mounjaro for chronic weight management, contact your doctor to discuss stopping treatment and appropriate pregnancy care.
What if I am using Mounjaro for type 2 diabetes?
Pregnancy does not mean that diabetes treatment can simply be stopped without a replacement plan.
If you have type 2 diabetes and become pregnant while taking Mounjaro, contact your healthcare professional promptly.
Your doctor may need to change your diabetes treatment and monitor your blood glucose more closely.
Keeping blood glucose under appropriate control is important during pregnancy, so do not stop diabetes medicines without professional guidance.
Can you take Mounjaro while breastfeeding?
The Australian Product Information states that it is unknown whether tirzepatide passes into human breast milk. A risk to newborns or infants cannot be excluded.
The Australian Mounjaro Consumer Medicines Information advises people who are breastfeeding or intend to breastfeed to discuss treatment with their doctor.
Your doctor can help weigh the potential benefits of treatment against the potential risks to the infant.
Is Mounjaro safe while breastfeeding?
There is currently not enough information to establish the safety of tirzepatide during breastfeeding.
Because it is unknown whether tirzepatide passes into human milk and the potential risk to a newborn or infant cannot be excluded, breastfeeding and Mounjaro treatment should be discussed with a healthcare professional.
Do not start, restart or continue Mounjaro during breastfeeding without discussing it with your doctor.
What happens if I accidentally take Mounjaro while pregnant?
Accidentally taking Mounjaro before realizing you are pregnant does not mean that a pregnancy will necessarily have a problem.
However, you should tell your doctor or pregnancy care professional.
Provide useful information such as:
- The date of your last Mounjaro injection
- Your Mounjaro dose
- How many doses you took after becoming pregnant, if known
- The date of your positive pregnancy test
- Other medicines and supplements you use
Your healthcare professional can determine what monitoring or follow-up is appropriate.
Can Mounjaro be restarted after pregnancy?
Possibly, but the timing depends on your individual circumstances.
If you are breastfeeding, your doctor will need to consider the limited information about tirzepatide in human milk and the potential risk to the infant.
If you are no longer breastfeeding and want to restart Mounjaro, your doctor can assess whether treatment remains appropriate and whether you need to restart at a lower dose.
Do not restart an old Mounjaro prescription without medical advice.
Mounjaro and pregnancy: what women should know before starting treatment
If pregnancy is possible, discuss contraception with your healthcare professional before starting Mounjaro.
This is particularly important because the TGA has issued specific advice concerning oral hormonal contraceptives during Mounjaro initiation and dose escalation.
Before starting treatment, tell your doctor if:
- You are pregnant
- You think you may be pregnant
- You are trying to become pregnant
- You recently stopped contraception
- You are breastfeeding
- You plan to breastfeed
- You use an oral contraceptive
This allows your treatment plan to be tailored appropriately.
Mounjaro and pregnancy: key points
The most important points are:
Mounjaro should not be used during pregnancy.
If you become pregnant while taking Mounjaro, contact your doctor promptly.
If you are planning pregnancy, discuss Mounjaro with your doctor before trying to conceive.
The effect of tirzepatide on pregnancy has not been adequately studied in humans.
Animal studies have identified reproductive and developmental concerns.
It is unknown whether tirzepatide passes into human breast milk.
Oral contraception requires additional precautions for 4 weeks after starting Mounjaro and 4 weeks after each dose increase.
Do not stop or restart other prescription medicines without medical advice.
Frequently Asked Questions
Can I take Mounjaro if I am pregnant?
No. Mounjaro should not be used during pregnancy. The Australian Product Information states that there are insufficient human data to establish its safety during pregnancy.
What should I do if I become pregnant on Mounjaro?
Contact your doctor or healthcare professional as soon as possible. Your doctor can advise whether treatment should be discontinued and whether alternative treatment or monitoring is needed.
Can I take Mounjaro while breastfeeding?
The safety of tirzepatide during breastfeeding has not been established. It is unknown whether tirzepatide passes into human milk, so discuss treatment with your doctor.
Does Mounjaro make birth control less effective?
Mounjaro may reduce the effectiveness of oral hormonal contraception when treatment is started or the dose is increased. Australian guidance recommends a non-oral method or an additional barrier method for 4 weeks after initiation and after each dose escalation.
Can Mounjaro improve fertility?
There is insufficient evidence to say that tirzepatide directly improves fertility. Changes in weight and metabolic health can affect reproductive health, so discuss pregnancy plans with your doctor.
Can I use Mounjaro while trying to lose weight before pregnancy?
If you are planning to become pregnant, discuss your weight-management treatment with your doctor. Mounjaro should not be used during pregnancy.
Can I take Mounjaro after giving birth?
This depends on whether you are breastfeeding, your medical circumstances and why Mounjaro is being prescribed. Your doctor can determine when treatment is appropriate.
The Bottom Line
Mounjaro is not recommended during pregnancy, and current Australian information does not establish its safety for an unborn baby.
If you are planning pregnancy, become pregnant while taking Mounjaro, or are breastfeeding, speak with your doctor before making treatment decisions.
If you are using an oral contraceptive, remember that Australian guidance recommends additional contraceptive precautions for 4 weeks after starting Mounjaro and for 4 weeks after every dose increase.
For a prescription medicine such as tirzepatide, pregnancy planning should always be part of the conversation with your healthcare professional.