I can’t go to work & am scared to move from the loo because of Mounjaro… but people say it’s down to WHERE I’m injecting

Published on July 10, 2025 at 01:29 PM

A MOUNJARO user has claimed that after 19 weeks of injecting, she is “too scared to move away from the toilet”; as a result of her side effects.

Maddy, who has lost 40lbs [2 stone 8lbs] since using the , is now unable to go to work as a result of suffering from .

Woman showing arm injection site side effects.
A young woman has revealed that she has been unable to go to work and is “too scared”; to leave her toilet, after suffering severe side effects on Mounjaro
Woman describing arm side effects from an injection.
Maddy has lost over two stone since using the fat jabs, but has been experiencing sickness, diarrhoea and sulphur burps
Mounjaro (tirzepatide) injection pen and box.
Mounjaro is typically used to treat type 2 diabetes

Posting on , the got candid on her side effects, leaving many open-mouthed.

As she stood in her bathroom, she confirmed that after injecting herself with , which is known as the King Kong of jabs, in her arm, she was very “poorly.”;

Not only did she feel sick, but she also had diarrhoea and too.

Despite this, Maddy confirmed that last Tuesday, she decided to inject in her arm again.

But by Wednesday afternoon, she noticed the re-emergence of sulphur burps – which have been described by many as foul-tasting burps that taste like eggs.

And that wasn’t all, as Maddy continued: “And I know what comes hand-in-hand with sulphur burps – it’s the s***s.”;

So it didn’t come as a surprise when Maddy woke up the following morning with an upset stomach, as she admitted: “I felt rough, but not too bad – I still went to work and then towards the end of the day at work, I felt like s**t, I literally went and slept in my car for half an hour because I just felt rough.”;

Upon returning home from work, Maddy then from 5:30pm until 11pm.

After waking up, the had some dinner and went back to bed, but it wasn’t long before more side effects started, as she confessed: “My belly felt so bubbly and gassy...Woke up two or three times in the night with the s***s and I actually did s**t myself.

“If you’re on Mounjaro, then you know, if you’re not, you won’t understand, so after that I thought, I’m not going to work today, I’m not even going to risk it. It’s not worth it at work.”;

Not only this, but she also revealed: “I’ve been too scared to move away from the toilet all morning because I still feel like s**t.”;

The clip, which was posted under the username @mjwithmad, has clearly left many open-mouthed, as it has quickly racked up 56,100 views, 892 likes and 118 comments.

My belly felt so bubbly and gassy

Maddy

But Maddy isn’t the only Mounjaro user to be experiencing such , as many others flocked to the comments to share their similar experiences.

One person said: “These sulphur burps are something else! I’m week three and I jabbed my arm yesterday. I feel dreadful!”;

Another added: “Did my first injection in my belly last week was fine, did my arm yesterday and today I feel so tired and sluggish, lost half a stone in a week though!”;

A third commented: “Not me seeing this video one day after I decided to jab in my arm for the first time. Now I’m scared.”;

Your choice of injection site can affect the side effects that you can experience when taking Mounjaro

Jason Murphy

Whilst one woman claimed: “Girl, this is so so common on !! More common than I’d like to admit.”;

Meanwhile, someone else wrote: “I was looking forward to trying my arm but now I’m not so sure.”;

What do the experts say?

After numerous complaining of similar side effects following injecting Mounjaro, which is said to suppress the ­, into their arms, we spoke to the experts to get their thoughts on why this might be happening.

Jason Murphy, Head of Pharmacy at Chemist4U told : “Your choice of injection site can affect the side effects that you can experience when taking .

“In a clinical trial, it was revealed that the overall percentage of participants who experienced side effects varied considerably – abdomen: 68.52%, upper arm: 57.41% and thigh: 43.40%.”;

There’s no universally ‘best’ site to inject – just the one that works best for you

Kiran Jones

Not only this, but Roj Helin Parlakyildiz, a Clinician and Clinical Content Lead at Voy, shared: “While the pharmacokinetics of subcutaneous injections like Mounjaro are generally consistent across approved sites (abdomen, thigh, upper arm), local absorption can still vary slightly based on factors like blood flow, fat distribution, and muscular activity in those areas. This may influence how quickly the medication is absorbed.

“For example, the upper arm may have less subcutaneous fat and more variable injection depth compared to the abdomen or thigh, especially if the injection technique is less controlled, as the upper arm can be an awkward site.

“This might lead to faster absorption, potentially triggering more acute gastrointestinal side effects like sulphur burps or diarrhoea in sensitive individuals.”;

Meanwhile, Clinical pharmacist Kiran Jones of Oxford Online Pharmacy also said to us: “While the injection site doesn’t theoretically have much influence on side effects experienced, some users consistently report more nausea with stomach injections.

“We’ve heard similar things from our patients, though we think this feedback is due to small individual differences like body fat distribution, blood flow, skin thickness and personal sensitivity. These can all subtly affect how your body responds, even if the absorption is technically the same.

“At the moment, hasn’t quite caught up with this phenomenon. But just because it isn’t fully explained doesn’t mean it isn’t happening.”;

As a result, this pharmacist stressed the importance of rotating injection sites, as he added: “If you notice more side effects in one area, try a different site next time. Keep a log of your symptoms and discuss any patterns with your pharmacist or healthcare provider.

“There’s no universally ‘best’ site to inject – just the one that works best for you.”;

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