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
Free tracker included with every download this week
Does Mounjaro Give You Wind?
Yes, wind and bloating are common side effects of Mounjaro (tirzepatide), though they typically improve over time. Wind and gas occur because Mounjaro slows how quickly food moves through your stomach and digestive system. This is part of how the medication helps you feel fuller for longer, but it can cause abdominal discomfort, bloating, and flatulence, especially during the first few weeks. Most people find these symptoms settle down as their body adjusts to the medication. Understanding what to expect and how to manage wind can help you stay on track with your treatment.
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Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
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.
Common Digestive Side Effects of Mounjaro
Wind and bloating are among the most frequently reported side effects of Mounjaro in clinical trials and real-world use. These symptoms occur because tirzepatide slows gastric emptying—the rate at which food leaves your stomach—which is central to how it helps regulate appetite. Other related digestive side effects include nausea, constipation, diarrhoea, and indigestion.
According to the SURMOUNT-1 trial data, digestive disturbances affect the majority of Mounjaro users, particularly when starting or increasing doses. The good news is that these side effects tend to be temporary. Most people experience the worst symptoms in the first 2–4 weeks on a new dose, with improvement occurring as their gut adjusts. If you're currently taking Mounjaro or considering it, using our free GLP-1 weight loss calculator can help you understand the full picture of what to expect, including realistic timelines for side effect resolution.
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How It Works
Three simple steps to understand your weight and take action.
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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Managing Wind and Bloating on Mounjaro
Several practical strategies can help reduce wind and bloating while on Mounjaro. Eat slowly and chew thoroughly—rushing meals or swallowing large pieces of food increases air intake and digestive discomfort. Choose easily digestible foods like lean proteins, vegetables cooked soft, and wholegrain carbohydrates. Avoid fizzy drinks, excessive fibre at once, and fatty or greasy foods, which worsen bloating. Staying hydrated and taking gentle walks after meals can aid digestion. If wind persists beyond 4–6 weeks or significantly impacts your quality of life, speak to your GP or prescriber—they may suggest dose adjustments, probiotic supplements, or anti-gas medications like simethicone to help manage symptoms.
- 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.
Is wind on Mounjaro normal?
Yes, wind and bloating are very common side effects affecting the majority of Mounjaro users. They typically appear within days of starting or increasing a dose and usually improve within 2–4 weeks as your body adjusts. If symptoms persist beyond 6 weeks, contact your prescriber.
Does wind mean Mounjaro is working?
Wind doesn't directly indicate Mounjaro is working for weight loss, but it does reflect how the medication is affecting your digestive system. Weight loss depends on the medication helping you eat less alongside a reduced-calorie diet and activity. Use our BMI calculator to track your progress objectively rather than relying on side effect intensity.
When does wind stop on Mounjaro?
Most people see digestive side effects settle within 2–4 weeks of starting a new dose. Some experience relief within days, others take longer. If symptoms haven't improved after 6 weeks, or if they're severe, discuss this with your GP or prescriber—dose adjustments or timing changes may help.
Can I take anything to stop Mounjaro wind?
Yes. Eating small, frequent meals, avoiding fizzy drinks, and staying hydrated help. Simethicone (a common over-the-counter anti-gas remedy) can provide relief. Probiotics may also help some people. Always check with your prescriber before adding supplements or medications.
How does Mounjaro compare to Wegovy for digestive side effects?
Both Mounjaro and Wegovy cause similar digestive symptoms including wind because both slow stomach emptying. Mounjaro is a dual GIP/GLP-1 medication, while Wegovy is a GLP-1 agonist only, but clinical data shows comparable digestive disturbances. Individual tolerance varies—your prescriber can advise which suits you best based on your health history.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.