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 Doses for Type 2 Diabetes in the UK
Mounjaro (tirzepatide) was originally approved in the UK for managing type 2 diabetes before its approval for weight management. If you have diabetes and are considering Mounjaro, understanding the dosing schedule is important. This guide explains the NHS-recognised dosing regimen, how the medication works in diabetes management, and how diabetes doses differ from weight management doses. Always consult your GP about whether Mounjaro is appropriate for your individual situation.
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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.
Mounjaro Diabetes Dosing Schedule and Titration
Mounjaro is a dual GIP and GLP-1 receptor agonist that helps regulate blood sugar in type 2 diabetes by stimulating insulin release and improving glucose control. The diabetes dosing schedule follows a slower titration than weight management dosing:
- Weeks 1–4: 2.5 mg once weekly (starting dose)
- Weeks 5–8: 5 mg once weekly
- Weeks 9–12: 7.5 mg once weekly
- Weeks 13–16: 10 mg once weekly
- Weeks 17–20: 12.5 mg once weekly
- Week 21+: 15 mg once weekly (maximum dose)
Each dose is maintained for a minimum of 4 weeks before escalation. Your prescriber may adjust your individual schedule based on your blood sugar response and tolerance. The medication works alongside diet, exercise, and often other diabetes medications including metformin or SGLT2 inhibitors.
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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.
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How Mounjaro Diabetes Doses Differ from Weight Management
Mounjaro is licensed in the UK for both type 2 diabetes and weight management, but the dosing approaches differ. For diabetes, the focus is on blood sugar control rather than weight loss alone, though many patients experience weight reduction as a secondary benefit. The titration is gradual to allow your body to adjust and to monitor HbA1c levels (your average blood sugar over 3 months). Weight management dosing follows a similar schedule but the clinical goal is different. Your NHS diabetes team or GP will assess which dosing pathway is appropriate for you based on your HbA1c level, kidney function, and other health factors. Use our free GLP-1 weight loss calculator to explore potential outcomes, and discuss individual targets with your prescriber.
- 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.
What is the starting dose of Mounjaro for type 2 diabetes?
The standard starting dose is 2.5 mg once weekly via injection. This dose is maintained for 4 weeks before gradual escalation. Your GP or diabetes specialist will monitor your blood sugar response at each stage and adjust if needed based on your individual tolerance and HbA1c levels.
How long does it take to reach the maximum Mounjaro dose?
It typically takes 20–24 weeks to reach the maximum dose of 15 mg once weekly, assuming you escalate by 2.5 mg every 4 weeks without interruption. However, some patients stabilise at lower doses if their blood sugar control is adequate, so the final dose depends on your individual response.
Is Mounjaro for diabetes the same as Mounjaro for weight loss?
Mounjaro contains the same active ingredient (tirzepatide) regardless of indication, but the dosing pathway, clinical goals, and monitoring differ. Diabetes dosing focuses on HbA1c control, while weight management dosing focuses on weight loss. Your prescriber will determine which pathway is appropriate for you.
Can I switch between Mounjaro and other diabetes medications?
Yes, Mounjaro can be used alongside or instead of other diabetes medications like metformin or SGLT2 inhibitors. However, if you're taking sulphonylureas or insulin, dose adjustments may be needed because Mounjaro can lower blood sugar. Always inform your GP of all medications before starting.
Where can I get a Mounjaro prescription for diabetes in the UK?
You can request a Mounjaro prescription from your GP or diabetes clinic. NHS access depends on your local integrated care board (ICB) and availability. Private prescriptions are also available through UK-licensed online prescribers following a clinical assessment. Your GP can advise on NHS availability in your area.
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