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
Mounjaro Maintenance Dose in the UK
Once you reach your target weight loss dose on Mounjaro, you'll enter a maintenance phase where you continue the same injection weekly to sustain your results. In the UK, most adults reach maintenance at either 10 mg or 15 mg once weekly, depending on their response and tolerance. Maintenance isn't about stopping โ it's about staying at an effective dose that keeps working alongside your ongoing lifestyle changes. This guide explains how maintenance works with Mounjaro in a UK context, including NHS prescribing, how long you typically stay on maintenance, and what happens if you need to adjust.
10,000+ calculations today ยท NHS-aligned thresholds ยท 100% free
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/mยฒ).
While BMI isn't a perfect measure โ it doesn't account for muscle mass, bone density, or fat distribution โ 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 โ 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 Mounjaro Maintenance Works in UK Practice
Mounjaro maintenance begins once you've completed the dose escalation phase and reached a dose that's delivering good results. In UK clinical practice and the SURMOUNT trials, most people stabilise at 10 mg or 15 mg weekly. At maintenance, you continue the same dose every week โ there's no further increase. The aim is to keep your weight stable and continue supporting your appetite regulation and metabolic health.
How long you stay on maintenance depends on:
- Your weight loss goals and whether you've reached them
- Your tolerance of the injection (some people experience persistent side effects)
- Your prescriber's assessment of ongoing benefit
- Your personal preference and lifestyle changes
NHS guidance and real-world data suggest most people remain on a maintenance dose for as long as the medicine is working and side effects are manageable. There's no set "maintenance window" โ it can be months or years. Your GP or private prescriber will review this regularly.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care โ from a UK-regulated online pharmacy.
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 โ 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 โ completely free.
NHS Maintenance Prescribing and Stopping Mounjaro
On the NHS, Mounjaro is prescribed through tier 3 specialist weight management services after a full assessment of your eligibility. Once on maintenance, your prescriber will monitor your progress and may continue prescribing if you're maintaining weight loss and there are no safety concerns. If you decide to stop Mounjaro, weight regain is common โ many people regain weight within weeks to months of stopping, particularly if lifestyle changes aren't sustained.
Stopping Mounjaro: You don't need to taper โ you can stop at any dose. However, discuss this with your prescriber first. Some people continue maintenance long-term; others use Mounjaro for a defined period to establish new eating habits and then stop. There's no one-size-fits-all approach. Using our free GLP-1 weight loss calculator can help you understand potential outcomes at different doses before adjusting your plan.
- 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 โ 5mg โ 7.5mg โ 10mg โ 12.5mg โ 15mg
- GLP-1 receptor agonist
- Up to 15โ17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg โ 0.5mg โ 1mg โ 1.7mg โ 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 | 15โ22.5% | 12โ17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20โ32 weeks | 16โ20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | ยฃ150โยฃ250/month | ยฃ150โยฃ300/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 โ 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 dose do most people stay on for Mounjaro maintenance?
Most UK adults stabilise at either 10 mg or 15 mg once weekly, depending on their individual response and tolerance. Your prescriber will recommend the lowest effective dose that delivers results without excessive side effects. Some people reach their target at 7.5 mg and stay there; others need the full 15 mg dose.
How long do you typically stay on a Mounjaro maintenance dose?
There's no fixed duration. You continue maintenance as long as the medicine is working, side effects are acceptable, and you're achieving your health goals. This can be months or years. Your prescriber will review regularly, usually every 3โ6 months, to assess whether to continue, adjust, or stop.
What happens to your weight if you stop Mounjaro?
Weight regain is common after stopping โ many people regain 30โ50% of lost weight within weeks to months. This happens because appetite regulation returns to baseline. The best way to minimise regain is to have established sustainable eating and exercise habits during your time on Mounjaro.
Can you switch doses on maintenance, or stay at the same dose forever?
You can adjust your maintenance dose if needed โ for example, if side effects become too much, your prescriber may reduce you to a lower dose. However, reducing the dose may mean less appetite support. Most people aim to find a stable dose they can tolerate long-term.
Is Mounjaro maintenance available on the NHS in the UK?
Yes, once prescribed through an NHS tier 3 specialist weight management service, maintenance prescribing can continue on the NHS if you meet ongoing criteria. However, availability and duration vary significantly by region. Private prescribing of Mounjaro outside the NHS is also available through online clinical assessments.
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.