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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Stopping Mounjaro — Your UK Health Guide
Stopping Mounjaro should always be done under medical supervision. Whether you've reached your weight loss goal, experienced side effects, or need to pause treatment, your prescriber will guide you through the process safely. This guide explains what happens when you stop, how to manage the transition, and where to access support in the UK.
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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.
How to Stop Taking Mounjaro Safely
Never stop Mounjaro abruptly without medical guidance. Your prescriber will create a personalised plan based on your individual needs. Mounjaro works as part of a long-term weight management strategy, and stopping suddenly can cause several changes:
- Appetite may return to previous levels within days or weeks
- Blood sugar levels may shift if you have type 2 diabetes
- Weight regain is common once treatment stops without lifestyle support
- Gastrointestinal symptoms may ease gradually as your body adjusts
Your GP or specialist will discuss whether a gradual dose reduction or immediate cessation is appropriate for your situation. If you experience severe side effects like persistent nausea or abdominal pain, contact your prescriber urgently—they may recommend stopping or switching to an alternative like Wegovy or dose adjustment of your current tirzepatide regimen.
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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.
What to Expect After Stopping and Managing Your Weight
After stopping Mounjaro, maintaining your weight loss requires continuing the lifestyle changes you've built—reduced-calorie eating habits and regular physical activity remain essential. Many people find that using our free progress tracker helps them stay accountable without medication support.
Weight regain typically begins within weeks to months after stopping, particularly if diet and exercise patterns return to pre-treatment levels. Some people maintain weight loss long-term through sustained behaviour change; others benefit from restarting treatment or exploring alternatives like Wegovy (semaglutide), which may suit different individuals. Your GP can help you assess whether returning to treatment, lifestyle-only management, or referral to NHS tier 3 weight management services is most appropriate for your goals.
After stopping Mounjaro, maintaining your weight loss requires continuing the lifestyle changes you've built—reduced-calorie eating habits and regular physical activity remain essential. Many people find that using our free progress tracker helps them stay accountable without medication support.
Weight regain typically begins within weeks to months after stopping, particularly if diet and exercise patterns return to pre-treatment levels. Some people maintain weight loss long-term through sustained behaviour change; others benefit from restarting treatment or exploring alternatives like Wegovy (semaglutide), which may suit different individuals. Your GP can help you assess whether returning to treatment, lifestyle-only management, or referral to NHS tier 3 weight management services is most appropriate for your goals.
- 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.
What happens to my appetite when I stop taking Mounjaro?
Appetite typically returns to previous levels within days to weeks of stopping. This is normal—the medication's appetite-suppressing effects wear off as tirzepatide clears your system. Managing this transition with structured meals, hydration, and portion control helps prevent sudden overeating. Your GP or a dietitian can provide practical strategies.
Will I regain all the weight I lost on Mounjaro?
Weight regain varies significantly between individuals. Some people maintain most of their loss through continued lifestyle changes; others regain weight gradually over months. Studies show that without ongoing treatment or sustained behaviour change, many people regain 50-75% of lost weight within 1-2 years. Long-term success depends on maintaining reduced-calorie eating and physical activity.
Can I restart Mounjaro after stopping it?
Yes, you can restart Mounjaro following a new clinical assessment with your prescriber. They'll evaluate whether it remains appropriate for you and whether you need to restart dose titration from 2.5mg or begin at a higher maintenance dose. Restarting requires a new prescription and assessment, so contact your GP or private prescriber to discuss.
What's the difference between stopping Mounjaro and switching to Wegovy?
Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist; Wegovy (semaglutide) is a GLP-1 agonist only. Switching involves stopping Mounjaro and starting Wegovy, which typically requires restarting dose titration. Your prescriber will advise on the transition period and timing. Both are prescription-only and require ongoing clinical assessment.
Should I contact my GP before stopping Mounjaro?
Yes, always contact your GP or prescriber before stopping, even if you're experiencing side effects. They can assess whether stopping is best, discuss temporary pausing, adjust your dose, or recommend alternatives. If you have type 2 diabetes, stopping may affect blood sugar control—medical guidance is essential.
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.