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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How to Stop Mounjaro Safely in the UK
Stopping Mounjaro requires careful planning and GP support. Unlike some medications, you cannot simply stop a Mounjaro UK prescription without medical guidance — your prescriber needs to manage your discontinuation safely. This guide explains NHS withdrawal protocols, what to expect when you stop tirzepatide, and how your weight may be affected. Whether you're accessing Mounjaro through NHS specialist services or privately, understanding the stop process is essential for your ongoing health.
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Calculate Your BMI Instantly
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.
NHS Protocol for Stopping Mounjaro Safely
Stopping Mounjaro should always be discussed with your GP or the prescriber who issued your tirzepatide prescription. The NHS recommends a gradual approach rather than sudden discontinuation. Your prescriber will typically:
- Review your weight loss progress and current health status
- Discuss your reasons for stopping — whether due to side effects, personal choice, or medical reasons
- Check for any weight-related health conditions that may need ongoing support
- Arrange follow-up care through your GP after stopping
- Provide guidance on maintaining weight loss through diet and physical activity alone
If you experience severe side effects that concern you, contact your prescriber immediately rather than stopping abruptly. Many Mounjaro side effects improve after the first few weeks, but your medical team can assess whether continuation is appropriate for you.
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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 Happens to Your Weight After Stopping Mounjaro
Weight regain is common after stopping any weight loss medication, including tirzepatide. Clinical trial data shows that without ongoing lifestyle changes, some people regain weight within weeks to months of stopping. However, this is not inevitable — weight regain depends entirely on whether you maintain the reduced-calorie diet and increased physical activity that supported your initial loss.
Your GP can help you transition to long-term weight management through NHS tier 1 or tier 2 services, which offer diet advice, behaviour change support, and community weight management programmes. Using our free progress tracker can help you monitor your weight during the transition period and stay accountable to 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.
Can I stop Mounjaro suddenly or do I need to taper it?
Do not stop Mounjaro suddenly without GP guidance. While tirzepatide is not physically addictive, abrupt discontinuation can lead to rapid appetite increase and side effect rebound. Discuss stopping with your prescriber, who may recommend a gradual approach depending on your situation and how long you've been taking it.
Will my weight return immediately if I stop Mounjaro?
Not immediately, but weight regain typically begins within weeks if you return to your previous eating habits. The rate of regain varies by individual. Maintaining the lower-calorie diet and physical activity patterns you developed while on Mounjaro is key to preventing rapid weight return. Our GLP-1 weight loss calculator shows projected outcomes — tracking your actual progress with our free progress tracker helps maintain accountability.
Can I restart Mounjaro after stopping it?
Yes, you can restart Mounjaro if appropriate, but this requires a new clinical assessment with your prescriber. You would typically restart at the lowest dose (2.5 mg) and titrate up again. Restarting is not automatic — your prescriber will assess whether it remains clinically suitable for you based on your current health status.
What NHS support is available after I stop Mounjaro?
After stopping, your GP can refer you to NHS tier 1 or tier 2 weight management services, which offer free support including diet advice, behaviour change coaching, and access to community weight management groups. These services help you maintain weight loss through lifestyle changes alone — a sustainable long-term approach.
Does stopping Mounjaro cause withdrawal symptoms?
Mounjaro is not addictive and does not cause clinical withdrawal. However, many people experience increased appetite, food cravings, and hunger shortly after stopping because the medication's appetite-suppressing effects wear off. These sensations are normal and typically peak within days to weeks as your appetite regulation returns to baseline.
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.