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 UK Prices: NHS and Private Costs Explained
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescribing, but costs vary significantly between the two routes. Understanding the pricing difference and how to access Mounjaro on prescription is essential for anyone considering this weight loss injection. This guide explains NHS eligibility, private costs, and what factors affect the price you'll pay in the UK.
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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 Much Does Mounjaro Cost on the NHS?
Access to Mounjaro through the NHS is free at point of use, but availability is limited to specialist tier 3 weight management services. NICE (National Institute for Health and Care Excellence) has approved tirzepatide for NHS use, but prescribing is restricted to specialist multidisciplinary weight management teams, not standard GP prescriptions. Eligibility requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or sleep apnoea.
The major barrier to NHS access is not cost but availability and waiting lists. Many ICBs (Integrated Care Boards) across the UK have limited capacity for specialist weight management services, meaning waiting times can be several months or longer. Regional variation is significant — some areas offer Mounjaro more readily than others. Your GP can refer you to your local tier 3 service, but there is no assures of access or timeline.
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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 Are Private Mounjaro Prices in the UK?
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month depending on the dose (2.5 mg starter through to 15 mg maximum). Each KwikPen contains four doses, so pricing reflects the full month's supply. Higher doses cost more — for example, a 5 mg dose costs significantly less than a 15 mg dose.
Private costs are usually lower than Wegovy at equivalent doses because Mounjaro's dual GIP and GLP-1 mechanism may deliver results at lower doses. Prices vary between GPhC-registered online pharmacies, so comparing quotes is worthwhile. Some private providers offer dose escalation packages or payment plans. Private prescriptions require a clinical assessment, but you don't need an NHS referral to specialist services.
Use our free BMI calculator above to check whether you meet the BMI thresholds for Mounjaro eligibility. Our GLP-1 weight loss calculator can help estimate potential weight loss outcomes at different Mounjaro doses, allowing you to weigh NHS wait times against private costs.
- 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 free on the NHS in the UK?
Yes, Mounjaro is free at point of use through NHS specialist tier 3 weight management services, as NICE has approved it. However, access is limited and varies by region. Waiting lists for specialist services can be several months or longer, and not all ICBs offer the same level of provision.
How much does a private Mounjaro prescription cost?
Private Mounjaro costs typically range from £129 to £320 per month depending on the dose. Each KwikPen contains four doses (one month's supply). Prices vary between GPhC-registered pharmacies, so it's worth comparing quotes before committing.
What's the difference between NHS and private Mounjaro prescribing?
NHS prescribing is free but requires referral to specialist tier 3 services with potential waiting lists. Private prescribing is faster and doesn't require NHS referral, but you pay the full cost. Both require a clinical assessment to confirm suitability.
Can my GP prescribe Mounjaro directly on the NHS?
No, Mounjaro prescribing is restricted to specialist tier 3 weight management services, not standard GP practices. Your GP can refer you to your local specialist service, but they cannot prescribe Mounjaro themselves under current NICE guidance.
Is Mounjaro cheaper than Wegovy in the UK?
Private Mounjaro is generally cheaper than Wegovy at equivalent weight loss outcomes. Because Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, lower doses may achieve similar results to higher Wegovy (semaglutide) doses, making the monthly cost comparatively lower.
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.