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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Mounjaro Maintenance Dose — What You Need to Know
Once you've reached your target Mounjaro dose, you'll move into the maintenance phase — where your injection dose stays the same each week. In the UK, most people stabilise at a dose between 10mg and 15mg per week, depending on their individual response and how well they tolerate the medication. Maintenance is where the real work begins: supporting sustainable weight loss through consistent dosing, lifestyle changes, and ongoing GP oversight. This guide explains how UK Mounjaro maintenance works, what to expect, and how to get the most from long-term 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 Mounjaro Maintenance Works in the UK
Mounjaro maintenance begins once you've titrated through the four dose escalation phases. The standard escalation is: 2.5mg (weeks 1–4), 5mg (weeks 5–8), 7.5mg (weeks 9–12), 10mg (weeks 13–16), 12.5mg (weeks 17–20), and finally 15mg (week 21 onwards). However, your prescriber may recommend staying at 10mg or 12.5mg if you're achieving good results and tolerating the dose well — there's no requirement to reach 15mg.
During maintenance, your tirzepatide KwikPen dose remains constant each week. You'll continue injecting once weekly, rotating your injection site between your stomach, thigh, and upper arm. Your prescriber will monitor your progress through regular check-ins (typically every 3–6 months on the NHS or as arranged with your private prescriber) to assess weight loss, side effects, and whether your dose remains appropriate.
- Maintenance doses typically range from 10mg to 15mg per week
- You may stay at a lower dose if it's working well for you
- Regular GP or prescriber contact is important to monitor progress
- Most people remain on maintenance indefinitely if weight loss goals are being met
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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.
NHS Maintenance and Prescription Support
If you're receiving Mounjaro through the NHS in the UK, your maintenance phase will be managed through your local tier 3 weight management service. They'll review your weight loss, side effects, and overall health at scheduled appointments — typically every 3–6 months. NICE approval means Mounjaro is available within NHS specialist services, though availability varies significantly by region (ICB). Your GP can refer you, but waiting lists can be lengthy in many areas.
Private prescribers managing your maintenance will usually arrange follow-up assessments online or via phone. You'll reorder your KwikPens before they run out — each pen contains four weeks' supply — and your prescriber will confirm your dose continues to be appropriate. Using our free BMI calculator alongside your progress tracker can help you and your prescriber assess your response between formal appointments and keep track of long-term trends.
If you experience new side effects during maintenance or if your weight loss plateaus, contact your prescriber immediately. Adjustments are sometimes needed — either stepping back to a lower dose if side effects become troublesome, or (rarely) escalating if you've been stable at a lower dose and your prescriber recommends a trial at the next level. Weight loss with Mounjaro vs Wegovy varies individually; clinical trials show tirzepatide achieved approximately 20.9% average body weight loss at 15mg in SURMOUNT-1, though results differ per person. Our GLP-1 weight loss calculator can help you estimate potential outcomes at your maintenance dose based on trial data.
- 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.
How long do I stay on Mounjaro maintenance?
There's no set end date — most people continue maintenance indefinitely if they're tolerating the medication well and achieving their weight loss goals. If you stop Mounjaro, weight often returns over time. Your prescriber will review this with you regularly. Duration depends on your personal health goals and how you respond long-term.
Can I reduce my Mounjaro dose during maintenance?
Yes. If you experience troublesome side effects or if your prescriber feels a lower dose is appropriate, stepping back is possible — for example, from 15mg to 12.5mg. This is a decision made between you and your prescriber based on your individual response and tolerance. Weight loss may slow slightly at a lower dose.
What happens if I miss a Mounjaro injection during maintenance?
If you miss your injection within 4 days of your scheduled dose, take it as soon as you remember and continue your normal schedule. If more than 4 days have passed, skip that dose and inject on your normal scheduled day. Never take a double dose. Inform your prescriber if you regularly miss doses.
Do I need regular blood tests during Mounjaro maintenance?
Your prescriber will arrange appropriate monitoring — this typically includes weight, blood pressure, and possibly blood tests (especially if you have diabetes). NHS services and most private prescribers will have a regular review schedule. Ask your prescriber what monitoring is planned for your maintenance phase.
Is Mounjaro maintenance available on the NHS in all UK regions?
Availability varies significantly by region (ICB) and local service provision. NICE has approved tirzepatide for NHS use within specialist tier 3 weight management services, but not all areas have the same level of provision or funding. Ask your GP about tier 3 services in your area, or explore private prescribing options if NHS access is limited.
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.