The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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Why Does Mounjaro Make You Burp?
Burping and belching are common side effects reported by people taking Mounjaro (tirzepatide) for weight management. This happens because of how the medication works in your digestive system. Understanding why it occurs, how long it typically lasts, and what you can do about it may help you manage this side effect more effectively. If burping persists or becomes bothersome, your GP can offer practical advice or consider adjusting your dose.
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What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
How Mounjaro Affects Your Digestion
Mounjaro is a GIP and GLP-1 receptor agonist — a dual-action medication that works differently to other weight loss injections. One of its key mechanisms is slowing gastric emptying, which means food moves through your stomach more slowly than usual. This delayed digestion can trap air in your stomach and cause excess gas production, leading to burping, bloating, and wind.
The medication also reduces appetite signals in your brain, which may mean you eat smaller meals or chew food differently. These changes to eating patterns can introduce more air into your digestive tract. Additionally, Mounjaro may alter how your gut bacteria function, which can produce extra gas. Burping is typically mild and improves over time as your body adjusts to the medication, usually within the first 4–8 weeks of starting treatment or after a dose increase.
- Slowed stomach emptying traps air and causes gas build-up
- Smaller meal sizes and changed eating habits introduce more air
- Gut bacteria changes can increase gas production
- Most commonly occurs in the first few weeks of treatment
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Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
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Managing Burping While on Mounjaro
Several practical strategies may help reduce burping whilst taking Mounjaro. Eat slowly and chew food thoroughly — this reduces the amount of air swallowed. Opt for smaller, more frequent meals rather than large portions, and avoid fizzy drinks, which add gas directly to your stomach. Stay upright after eating and limit foods that commonly cause bloating, such as beans, cruciferous vegetables (broccoli, cabbage), and high-fat foods.
If side effects persist beyond 8 weeks, contact your GP — they can assess whether your mounjaro dose titration schedule needs adjusting or whether a different approach is needed. In most cases, as your body adapts to the medication, burping naturally decreases. Staying hydrated and taking gentle exercise like walking may also support digestion. Remember that prescription weight loss medications like Mounjaro work best alongside a reduced-calorie diet and increased physical activity.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
How long does Mounjaro burping typically last?
Burping usually improves within 4–8 weeks as your body adjusts. If it persists beyond this, speak to your GP about dose adjustments or strategies to manage it. Most people find it becomes less bothersome over time.
Is burping a sign that Mounjaro is not working?
No. Burping is a side effect of how Mounjaro slows digestion — it does not indicate whether the medication is effective for weight management. Clinical trials and NHS guidance confirm that side effects and weight loss outcomes are separate.
Can I reduce burping by changing my diet?
Yes. Eating slowly, chewing thoroughly, avoiding fizzy drinks, limiting high-fat and gas-producing foods (beans, cabbage), and eating smaller meals can all help reduce burping whilst on Mounjaro.
Should I stop taking Mounjaro if I experience burping?
No — do not stop without speaking to your GP first. Burping is a common, usually temporary side effect. Your prescriber can discuss whether dose adjustments, lifestyle changes, or other support might help you manage it.
How does Mounjaro burping compare to Wegovy?
Both are GLP-1-based medications that slow digestion, so both can cause burping. Mounjaro uses a dual GIP/GLP-1 mechanism, whilst Wegovy (semaglutide) uses GLP-1 only. Individual side effect experience varies — some people report burping with one but not the other.
Ready to take control of your weight loss journey?
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