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 Weight Loss Cost in the UK
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS specialist services and private prescription routes. The cost varies significantly depending on how you access it — NHS availability is limited and dependent on your region, while private prescription typically costs between £129 and £320 per month depending on dose. Understanding the different access routes and real costs can help you explore what's available to you and make an informed decision about weight loss treatment options.
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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.
Private Prescription Cost for Mounjaro in the UK
Private Mounjaro prescriptions in the UK typically cost between £129 and £320 per month, depending on your dose and the provider. Most private prescriptions are dispensed by GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber — no face-to-face appointment required.
Cost varies by dose because Mounjaro is a dose-titration medication:
- 2.5 mg dose (starting dose) — typically £129–£150
- 5–7.5 mg doses (mid-range) — typically £160–£210
- 10–15 mg doses (higher/maintenance doses) — typically £240–£320
These are approximate ranges across UK private providers. The final cost depends on the specific pharmacy and prescriber you use. Some providers offer subscription discounts or package deals if you commit to multiple months upfront.
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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 vs Private Access — How to Get Mounjaro in the UK
NHS access: Mounjaro is approved by NICE for use within NHS specialist tier 3 and tier 4 weight management services. However, access is limited and varies significantly by region. You'll typically need a GP referral to a specialist weight management service, and waiting lists can extend several months or longer depending on where you live. Once prescribed through the NHS, Mounjaro is free at the point of use.
Private access: You can access Mounjaro privately without an NHS referral by completing an online consultation with a UK-licensed prescriber. The prescriber will assess your eligibility based on BMI and health history, and if suitable, issue a prescription that can be dispensed by a GPhC-registered pharmacy. This route typically takes 1–2 weeks from consultation to first injection delivery.
To get started with a private prescription, you'll typically upload your height, weight, and medical history online, have a brief consultation with a prescriber (via phone or online assessment), and receive your prescription if approved. Injections are then posted to your home. Calculate your potential weight loss using our GLP-1 weight loss calculator to understand what results might be realistic for your situation — this can help inform your discussions with a prescriber. You can also use our free BMI calculator to establish your starting point and track improvements over time with our progress tracker tool.
- 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 weight loss injection available on the NHS for free?
Yes, Mounjaro (tirzepatide) is approved by NICE for use within NHS specialist weight management services and is free at the point of care if prescribed by the NHS. However, access is limited and varies by region — you'll need a GP referral to a specialist service, and waiting lists can be very long (sometimes several months). Not all NHS areas currently prescribe Mounjaro.
What does Mounjaro cost with a private UK prescription?
Private Mounjaro prescriptions typically cost between £129 and £320 per month depending on dose. Starter doses (2.5 mg) are usually cheaper, while higher maintenance doses (10–15 mg) are at the upper end. Costs vary slightly between providers, and some offer discounts for committing to multiple months upfront.
How do I get a private prescription for Mounjaro in the UK without seeing my GP?
You can access a private prescription by completing an online consultation with a UK-licensed prescriber through a GPhC-registered pharmacy. You'll provide your height, weight, and medical history online, the prescriber will assess your eligibility, and if approved, they'll issue a prescription that the pharmacy dispenses and posts to your home.
Can I use Mounjaro while waiting for NHS access?
Some people do access Mounjaro privately while on an NHS waiting list, then transition to NHS prescription if it becomes available in their area. However, this requires funding the private prescription yourself initially. Your prescriber or GP can advise whether this is a suitable option for your situation.
What's the difference between Mounjaro and Wegovy in terms of cost?
Mounjaro and Wegovy (semaglutide) have broadly similar private prescription costs in the UK — typically £129–£320 per month. The main differences are the mechanism (Mounjaro is dual GIP+GLP-1, Wegovy is GLP-1 only) and clinical outcomes from trials. Both require prescription and clinical assessment regardless of cost.
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.