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 for Diabetes on the NHS
Mounjaro (tirzepatide) is approved in the UK for type 2 diabetes management, though NHS access is limited compared to weight management indications. It works by activating GIP and GLP-1 hormone pathways to improve blood sugar control and may support modest weight loss as a secondary benefit. This guide explains how Mounjaro is used in diabetes care, NHS availability, and how it differs from other diabetes medications. If you have type 2 diabetes, your GP can discuss whether Mounjaro might be suitable alongside your current treatment plan.
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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 Works for Type 2 Diabetes
Mounjaro is a dual GIP and GLP-1 receptor agonist, meaning it activates two natural hormone pathways that regulate blood sugar. When you eat, GIP and GLP-1 hormones signal your pancreas to release insulin in response to food, helping keep blood sugar stable. Mounjaro amplifies these signals, making your body's natural glucose control more effective.
Unlike insulin injections, Mounjaro doesn't replace insulin — it helps your own pancreas work better. It also slows how quickly food leaves your stomach, which can help reduce appetite and support gradual weight loss. Clinical evidence shows tirzepatide (the active ingredient in Mounjaro) improves HbA1c (long-term blood sugar control) more effectively than some other injectable diabetes medications, and studies suggest an average weight loss of 5–15% body weight as a secondary benefit.
Mounjaro is delivered via a once-weekly KwikPen injection, making it simpler than daily insulin or other injectable medications.
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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.
Mounjaro and NHS Type 2 Diabetes Management
Mounjaro is approved for type 2 diabetes management in the UK, but NHS prescribing for diabetes is not yet routine across all areas. NICE (National Institute for Health and Care Excellence) guidance has reviewed tirzepatide for diabetes, but commissioning decisions vary by region and specialist tier. Most commonly, Mounjaro for diabetes is prescribed through NHS specialist endocrinology services or diabetes clinics, typically for adults whose blood sugar remains inadequately controlled on other medications.
Access depends on your local ICB (Integrated Care Board) and whether your diabetes team has tirzepatide available. Your GP can refer you to a specialist diabetes service, where a consultant will assess whether Mounjaro is appropriate based on your HbA1c, existing treatments, and any weight-related complications. Private access is also available following an online clinical assessment with a UK-licensed 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.
Is Mounjaro approved for diabetes on the NHS?
Yes, Mounjaro is approved for type 2 diabetes in the UK. However, NHS prescribing is not yet universally available and varies by region. It's typically offered through specialist diabetes services for adults whose blood sugar remains high despite other medications. Your GP can refer you to a local diabetes clinic to discuss suitability.
How is Mounjaro different from Ozempic for diabetes?
Both contain GLP-1 agonists, but Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, offering a different mechanism. Clinical trials suggest tirzepatide may improve blood sugar control more effectively than semaglutide (Ozempic) alone. Your diabetes specialist will recommend whichever is most appropriate for your situation.
Can Mounjaro replace my insulin injections?
Mounjaro does not replace insulin — it helps your pancreas produce more of its own insulin in response to food. If you're on insulin, your dose may need adjusting when you start Mounjaro. Any medication changes must be managed by your GP or diabetes specialist.
What weight loss can I expect from Mounjaro for diabetes?
Weight loss is a secondary benefit, not the primary goal of diabetes treatment. Clinical trials showed average weight loss of 5–15% body weight, but results vary. Your main goal will be improving HbA1c. Use our free BMI calculator and GLP-1 weight loss calculator to track your health metrics.
How do I access Mounjaro for diabetes through the NHS?
Speak to your GP about referral to a specialist diabetes service or endocrinology clinic. They'll assess your blood sugar control, current medications, and whether Mounjaro is appropriate. Wait times vary by region. Private prescribing is available as an alternative through online consultations.
Ready to take control of your weight loss journey?
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