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 Wean Off Mounjaro Safely
Stopping Mounjaro (tirzepatide) should always be discussed with your prescriber—never stop abruptly without guidance. While there is no formal "weaning" protocol like some other medications, a structured approach to stopping helps manage your transition and supports continued weight management. This guide explains what you need to know about discontinuing Mounjaro in the UK and what to expect when you stop. Always consult your GP or prescriber before making any changes to 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.
How To Stop Mounjaro — Prescriber Guidance
There is no official "weaning" schedule for Mounjaro in the way some medications require gradual dose reduction. However, you should never stop Mounjaro suddenly or without discussing it with your prescriber first. Your GP or the healthcare provider managing your tirzepatide prescription will advise the best approach for you personally.
- Contact your prescriber first. Whether you access Mounjaro through NHS specialist services or a private online prescriber, inform them you wish to stop before your next injection.
- Arrange your final dose. Your prescriber will confirm when to take your last Mounjaro KwikPen injection. Some people stop immediately; others may space out final doses.
- Discuss your plan. Talk about continuing dietary changes and physical activity to help maintain weight loss after stopping.
- Plan follow-up support. Ask about ongoing monitoring, dietary advice, or alternative weight management strategies if needed.
Stopping Mounjaro is your choice, but medical guidance makes the transition safer and more effective for long-term weight management.
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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 Mounjaro
After stopping Mounjaro, many people experience a gradual return of appetite and food cravings over several weeks as the tirzepatide leaves their system. This does not mean your weight loss is lost—the lifestyle changes you have made (dietary habits, physical activity) remain valuable. Weight regain is possible if you return to previous eating patterns, but many people maintain significant weight loss through sustained behavioural changes.
Some side effects (like nausea or constipation) typically resolve within days to weeks of stopping. Your GP can discuss strategies to manage your weight without medication, including NHS weight management programmes, dietary support, or consideration of alternative approaches. Our free GLP-1 weight loss calculator and progress tracker can help you plan and monitor your ongoing health journey after treatment.
- 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 immediately or must I wean off gradually?
Unlike some medications, Mounjaro does not require a formal weaning schedule. However, you should never stop without speaking to your prescriber first. They will confirm the safest approach for you. Some people stop after their final dose; others may taper. Always get medical guidance before stopping.
What happens to my weight when I stop Mounjaro?
Weight loss you have achieved typically remains stable if you maintain dietary changes and physical activity. Appetite may gradually return as tirzepatide leaves your system. Weight regain occurs mainly if eating patterns return to pre-treatment levels. The lifestyle changes you have built are key to long-term success.
Why shouldn't I just stop taking Mounjaro on my own?
Your prescriber needs to know you are stopping to monitor your health, discuss alternative support strategies, and help prevent rapid weight regain. Medical guidance ensures a smoother transition and may include referral to NHS weight management services or other support options.
How long does it take to feel normal after stopping Mounjaro?
Most side effects (nausea, stomach issues) resolve within days to weeks. Appetite returns gradually over 2–4 weeks as the medication clears your system. Energy levels typically normalise quickly. Your GP can advise on what to expect based on your individual situation.
Should I do anything special diet-wise when I stop Mounjaro?
Continue the dietary habits and physical activity you have built during treatment. These are your foundation for weight stability. Discuss a personalised plan with your GP or a dietitian. NHS weight management services can also provide ongoing support if you access Mounjaro through the NHS.
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.