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Weight loss injections/treatments

Discuss weight-loss injections and treatments, including personal experiences. Mumsnet hasn't checked the qualifications of anyone posting here. You may wish to speak to a medical professional before starting any treatments.

Pregnancy

7 replies

GirlBottle · 20/06/2025 10:33

Has anyone got pregnant on mounjaro? What would happen? I can't find anything conclusive online.

OP posts:
Mrsttcno1 · 20/06/2025 11:08

It is absolutely not recommended. Animal studies suggest harm to the foetus, they will not test the drug on pregnant women in clinical trials obviously but the results from the animal studies were not good.

Octaviathethird · 20/06/2025 11:38

I'm on Mounjaro (NHS prescribed) in order to get to the right weight for IVF. I have to have (specified by my endocrinologist who provides my pre pregnancy and then, hopefully, my pregnancy care) a 2 month "wash out" period once I get to the right weight before I can get pregnant, to make sure there is no Mounjaro left in my system. The weight lose injections can cause (in animals) an aggressive (medullary) type of thyroid cancer, which has been shown to occur in animal studies where the babies end up being born with thyroid cancer. Is it not known whether future human babies born to mums on weight loss injections may be predisposed to medullary thyroid cancer. Personally, if I hadn't already had my thyroid removed, due to follicular (non aggressive) thyroid cancer, I wouldn't take the weight loss injections at all because I would be too nervous about the potential risk of medullary thyroid cancer.
There is real world evidence being gathered about whether these drugs are safe for foetuses because many women are accidentally getting pregnant on them, as rapid weight loss can restart ovulation, but it will take a while for any conclusions to be reached. Personally, I abstain to make sure there is no risk, despite pregnancy being highly unlikely as I have no fallopian tubes and only one ovary remaining. I think if I accidentally got pregnant whilst on Mounjaro, I would have to consider abortion and after what I have been through to try to be able to have another baby, that would absolutely break me, so it's a risk I am unwilling to take.
Please don't try to get pregnant whilst on any type of weight loss injection, and if you have accidentally fallen pregnant, stop taking the weight loss injections immediately and make a GP appointment to get their opinion on the situation.

GirlBottle · 20/06/2025 12:35

Thank you for your replies. Currently feeling sick with worry. No one told me about the pregnancy issues when I started, prescribed by a health care professional aswell!
If anyone has actually got pregnant while on it, please comment

OP posts:
Octaviathethird · 20/06/2025 12:57

I'm so sorry, I absolutely did not want to worry you. Just don't have any more injections and speak to your GP. Many women are going ahead with their pregnancies but your GP is best placed to advise. How far along are you? I would presume the earlier on you are the better, before the placenta is formed, blood will not be being shared between you and the baby. It may be that in animal studies the pregnant rats were exposed all the way through pregnancy, rather than a limited time at the beginning.
Personally, I would complain about the health care provider because they have a duty to inform you of the risks. It's not supposed to be given to women of child bearing age if there is any chance of becoming pregnant.

SilenceInside · 20/06/2025 13:03

Your HCP should have definitely made it very clear that you should not get pregnant whilst on Mounjaro, but it is also clearly mentioned in both patient leaflets that come with the pen in the medication box. If you ordered online most pharmacies highlight it with a section that you need to acknowledge before continuing. But a HCP you have a direct face to face meeting with should be specifically highlighting it and making sure that you are aware.

Mrsttcno1 · 20/06/2025 13:04

Did you not receive or read the leaflets on the medication OP? It is written very clearly on there, and HCP should have mentioned.

WeAllHaveWings · 20/06/2025 13:48

Very important to read patient leaflets for any new medication. They are there for the very purpose of informing you of things like this - never take any medication blindly.

There were no clinical trials on human pg so there is no reliable data. Animal trials showed there were potential risks, a quick google will give more information on the animal studies to help, along with discussions with your GP to base any decisions on.

Good luck.

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