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
How Do You Stop Taking Mounjaro?
Stopping Mounjaro (tirzepatide) should always be done under the guidance of your GP or prescriber, rather than stopping suddenly. Unlike some medications, there is no formal "tapering" schedule — most people simply stop their weekly injections — but your prescriber needs to monitor you during this transition. This guide covers NHS protocols for safely discontinuing Mounjaro in the UK, what happens after you stop, and why medical supervision matters.
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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.
NHS Guidance on Stopping Mounjaro Safely
There is no official gradual tapering schedule for Mounjaro. Because tirzepatide is a once-weekly injection, you and your prescriber simply agree to stop administering the weekly dose. However, stopping should always be a planned decision made with your GP or the specialist team managing your care — never stop abruptly without discussion.
- Your prescriber will review your progress and reasons for stopping
- They may recommend a final injection to clear your system
- You should discuss timing — ideally after a routine weekly injection date
- NHS tier 3 weight management services will document your discontinuation and follow-up plan
- If you developed side effects, your team may suggest stopping rather than dose reduction
- Blood sugar and blood pressure monitoring may be recommended post-discontinuation if you have diabetes or hypertension
The dose titration that brought you onto Mounjaro took 16–20 weeks; stopping is typically much faster, with effects beginning to wear off within days as the injection clears your system.
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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 After You Stop Mounjaro?
After your final Mounjaro KwikPen injection, the medication typically clears your body within 7–10 days. You may notice appetite returning gradually, and any weight lost on the medication may start to return if diet and exercise habits are not maintained. This is why NHS guidance emphasises that Mounjaro works alongside lifestyle changes, not instead of them.
- Appetite and hunger signals gradually return to baseline
- Nausea and GI side effects resolve within days
- Weight regain is common without continued dietary discipline
- Any improvements to blood sugar or blood pressure may decline
- Your GP may continue monitoring if you have diabetes or cardiovascular risk factors
- Use our free progress tracker to monitor changes and maintain accountability post-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 whenever I want?
You should always discuss stopping with your GP or prescriber first. While Mounjaro doesn't require gradual tapering like some medications, stopping should be a planned decision. Your team will check your reasons for stopping and discuss your plans to maintain weight loss through diet and exercise.
Will I regain weight after stopping Mounjaro?
Weight regain is common after stopping unless you maintain the dietary and lifestyle changes you made during treatment. Clinical evidence shows that without ongoing behavioural support, most people gradually return to their pre-treatment weight. Your GP can discuss ongoing support options.
Do I need to taper Mounjaro doses before stopping?
No — there is no official tapering schedule for Mounjaro. Unlike some medications, you simply stop the weekly injections after a planned discussion with your prescriber. Effects typically wear off within 7–10 days as the medication clears your system.
What should I do if I want to stop due to side effects?
Contact your GP or prescriber immediately. Common side effects like nausea often improve with time or dose adjustment. If side effects are intolerable, your prescriber may recommend stopping rather than reducing the dose, and will discuss alternative weight management approaches.
Can my NHS GP prescribe Mounjaro, or only specialist services?
Mounjaro is typically prescribed through NHS tier 3 specialist weight management services following referral from your GP. Availability varies significantly by region. Your GP can discuss whether you are eligible for specialist referral or whether private prescribing options are appropriate for you.
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.