Being on Mounjaro is no joke – I had the most embarrassing side effect & ended up on a corner shop loo…but it gets worse

The Sun

09-07-2025

A MOUNJARO user has candidly opened up on what happened after she used fat jabs for just four weeks.
Despite being 'really happy' with losing two to three lbs a week on the injections, Megan Craze, who is from Wales, recently shared all on her most embarrassing side effect.
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Not only did the brunette find herself on the loo in a local corner shop where the staff could hear everything, but that wasn't the worst of it.
Posting on social media, Megan, who has lost over 16lbs in four weeks on fat jabs, claimed that bowel movements on Mounjaro are "no joke,' as she opened up on "the worst experience on Monjaro."
Being brutally honest, Megan said: 'I was out driving like I normally do, I was about half an hour away from home and I had no warning and oh my god, I needed to s**t.
'It was one of those s***s that if you don't go, you're gonna s**t yourself.'
Mounjaro, which is known as the King Kong of jabs, is now being prescribed on the NHS in the first anti-obesity rollout of its kind.
It is said to suppress the ­ appetite, making people feel fuller for longer.
Such injections are licensed for patients with type 2 diabetes and to assist those who are clinically obese - with a Body Mass Index of 30 or over.
One jab is administered each week but the duration is dependent on a person's weight.
Many Mounjaro users have been candid on experiencing diarrhoea whilst using the jabs - and this is exactly what happened to Megan.
After experiencing a strong urge to go to the toilet whilst driving, the content creator admitted that she pulled over and desperately ran into the first corner shop she could see.
And after begging a staff member if she could use their loo, thankfully he agreed.
But what happened next left Megan mortified, as she confessed that the staff member could hear everything.
She explained: "No joke - the toilet of the corner shop was literally right next to the counter and he could hear me s******g.
'I felt so awkward, I could have literally swallowed the ground up.'
But that wasn't the worst of Megan's embarrassing experience, as just moments later, she found herself in a very similar, but somewhat worse situation.
She shared: 'After that, I got back in the car, travelled another 10 minutes and I had that feeling again - I had to pull over and run into a pub and what made it even worse about the pub was the toilets were so close to the bar, the bar could hear me s******g and they were laughing at me.'
Reflecting on the awkward 'disaster,' Megan begged her followers to not 'laugh' at her.
Mounjaro users react
The TikTok clip, which was posted under the username @ megancraze01, has clearly left many open-mouthed, as it has quickly racked up 52,500 views.
Not only this, but it's also amassed 534 likes, 100 comments and 200 shares in just two days.
But it's not just Megan suffering with unfortunate bowel movements, as numerous Mounjaro users raced to the comments to share their similar experiences.
One person said: 'This is me!!!! It goes ALL DAY.'
Another added: 'I had this so badly I passed out, fell off the toilet and smacked my head on the floor.'
A third commented: 'Ahh this happened to me Sunday and today!! And I'm not joking, the smell! I've also got sulphur burps!'
Meanwhile, one user wrote: 'That can not be healthy for you, I'd stop using it and try different ways to lose weight if that's your goal. Healthy diet in a calorie deficit and exercise will help you.'
But to this, Megan fumed and clapped back: 'Why don't you mind your business and leave me to do my own thing? You're a literal stranger, why are you so bothered?'
Everything you need to know about fat jabs
Weight loss jabs are all the rage as studies and patient stories reveal they help people shed flab at almost unbelievable rates, as well as appearing to reduce the risk of serious diseases.
Wegovy – a modified version of type 2 diabetes drug Ozempic – and Mounjaro are the leading weight loss injections used in the UK.
Wegovy, real name semaglutide, has been used on the NHS for years while Mounjaro (tirzepatide) is a newer and more powerful addition to the market.
Mounjaro accounts for most private prescriptions for weight loss and is set to join Wegovy as an NHS staple this year.
How do they work?
The jabs work by suppressing your appetite, making you eat less so your body burns fat for energy instead and you lose weight.
They do this my mimicking a hormone called GLP-1, which signals to the brain when the stomach is full, so the drugs are officially called GLP-1 receptor agonists.
They slow down digestion and increase insulin production, lowering blood sugar, which is why they were first developed to treat type 2 diabetes in which patients' sugar levels are too high.
Can I get them?
NHS prescriptions of weight loss drugs, mainly Wegovy and an older version called Saxenda (chemical name liraglutide), are controlled through specialist weight loss clinics.
Typically a patient will have to have a body mass index (BMI) of 30 or higher, classifying them as medically obese, and also have a weight-related health condition such as high blood pressure.
GPs generally do not prescribe the drugs for weight loss.
Private prescribers offer the jabs, most commonly Mounjaro, to anyone who is obese (BMI of 30+) or overweight (BMI 25-30) with a weight-related health risk.
Private pharmacies have been rapped for handing them out too easily and video calls or face-to-face appointments are now mandatory to check a patient is being truthful about their size and health.
Are there any risks?
Yes – side effects are common but most are relatively mild.
Around half of people taking the drug experience gut issues, including sickness, bloating, acid reflux, constipation and diarrhoea.
Dr Sarah Jarvis, GP and clinical consultant at patient.info, said: 'One of the more uncommon side effects is severe acute pancreatitis, which is extremely painful and happens to one in 500 people.'
Other uncommon side effects include altered taste, kidney problems, allergic reactions, gallbladder problems and hypoglycemia.
Evidence has so far been inconclusive about whether the injections are damaging to patients' mental health.
Figures obtained by The Sun show that, up to January 2025, 85 patient deaths in the UK were suspected to be linked to the medicines.
At the same time, other Mounjaro users opened up about experiencing constipation whilst using the jabs.
One user admitted: 'I can't even poop on mine.'
A second confessed: 'I wish I had this!!! I'm completely backed up! Have been since I started!'
Whilst someone else acknowledged: 'I'm the opposite. Haven't gone in over a week.'
The reality of fat jabs
Not only have many dealt with mortifying side effects whilst using Mounjaro, but last year it was revealed that Scots nurse Susan McGowan, 58, died after taking low-dose injections of Mounjaro over a fortnight.
A probe also found that nearly 400 people have gone to hospital after taking weight loss drugs.
What are the other side effects of weight loss jabs?
Like any medication, weight loss jabs can have side effects.
Common side effects of injections such as Ozempic include:
Nausea: This is the most commonly reported side effect, especially when first starting the medication. It often decreases over time as your body adjusts.
Vomiting: Can occur, often in conjunction with nausea.
Diarrhea: Some people experience gastrointestinal upset.
Constipation: Some individuals may also experience constipation.
Stomach pain or discomfort: Some people may experience abdominal pain or discomfort.
Reduced appetite: This is often a desired effect for people using Ozempic for weight loss.
Indigestion: Can cause a feeling of bloating or discomfort after eating.
Serious side effects can also include:
Pancreatitis: In rare cases, Ozempic may increase the risk of inflammation of the pancreas, known as pancreatitis, which can cause severe stomach pain, nausea, and vomiting.
Kidney problems: There have been reports of kidney issues, including kidney failure, though this is uncommon.
Thyroid tumors: There's a potential increased risk of thyroid cancer, although this risk is based on animal studies. It is not confirmed in humans, but people with a history of thyroid cancer should avoid Ozempic.
Vision problems: Rapid changes in blood sugar levels may affect vision, and some people have reported blurry vision when taking Ozempic.
Hypoglycemia (low blood sugar): Especially if used with other medications like sulfonylureas or insulin.
The common side effects include nausea, vomiting and diarrhoea, which can lead to severe dehydration.
And if that wasn't bad enough, doctors say they have also seen 'life-threatening complications', including seizures, bowel obstruction and inflammation of the pancreas.
Model Lottie Moss, 27, even said she had a seizure after taking high doses of Ozempic.
The makers of Mounjaro, Lilly UK, said patient safety is its 'top priority'.
Lilly UK stressed: 'Regulatory agencies conduct extensive independent assessments of the benefits and risks of every new medicine and Lilly is committed to continually monitoring, evaluating, and reporting safety data.
'If anyone is experiencing side effects when taking any Lilly medicine, they should talk to their doctor or other healthcare professional.'