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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How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes, with significantly different costs depending on which path you choose. If you're considering this GLP-1 alternative for weight management, understanding the financial and access routes will help you make an informed decision. This guide breaks down current UK pricing, eligibility criteria, and what to expect from each access route — whether through the NHS or a private online consultation with a licensed prescriber.
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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 and Access
Private prescription costs for Mounjaro in the UK typically range from £140 to £320 per month, depending on your starting dose and where you obtain your prescription. The Mounjaro KwikPen comes in six different doses (2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg), and each contains four weekly injections — meaning one pen lasts approximately one month.
- Starting doses (2.5–5 mg): usually £140–£180/month
- Mid-range doses (7.5–10 mg): usually £180–£240/month
- Higher doses (12.5–15 mg): usually £240–£320/month
Private access involves an online consultation with a UK-licensed prescriber through a GPhC-registered pharmacy. The prescriber will assess your eligibility based on your BMI, health history, and weight-related conditions. If approved, you'll receive a prescription that the pharmacy dispenses and delivers. This route doesn't require an NHS referral and can be faster than waiting for specialist services.
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No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 Access vs Private Routes
NHS access to Mounjaro is free at the point of use but involves a longer pathway. Your GP refers you to a tier 3 specialist weight management service, where a multidisciplinary team assesses your suitability. NICE has approved tirzepatide for NHS use, but availability varies significantly by region — some areas have waiting lists of many months. Once prescribed through the NHS, you pay nothing for the medication itself (though there's a standard prescription charge if you're not exempt).
The private route is faster and doesn't require NHS referral but costs substantially more. Many people use the GLP-1 weight loss calculator on this page to estimate potential outcomes at different doses before committing financially. Use your free BMI calculator above to confirm your eligibility status (BMI 30+, or 27+ with weight-related health conditions).
- 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 available on the NHS for weight loss in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use through specialist tier 3 weight management services. However, availability and waiting times vary significantly by region. Your GP must refer you to your local specialist service first. Once approved, the medication is free, but access can take months depending on demand.
What is the typical monthly cost of Mounjaro on private prescription in the UK?
Private Mounjaro costs typically range from £140–£320/month depending on your dose. Starting doses (2.5–5 mg) cost around £140–£180, mid-range doses (7.5–10 mg) cost £180–£240, and higher doses (12.5–15 mg) cost £240–£320. Each KwikPen contains four weekly injections, lasting approximately one month.
How do I access Mounjaro privately in the UK without NHS referral?
Book an online consultation with a UK-licensed prescriber through a GPhC-registered pharmacy. The prescriber reviews your health details, assesses eligibility, and issues a prescription if appropriate. Your prescription is then dispensed and delivered to you. This route is faster than NHS specialist services but involves private costs.
What health conditions make me eligible for Mounjaro in the UK?
You're eligible if you have a BMI of 30 or above, or a BMI of 27–29.9 with at least one weight-related condition such as type 2 diabetes, prediabetes, high blood pressure, abnormal cholesterol, sleep apnoea, or cardiovascular disease. Your prescriber will assess your individual circumstances.
Does private Mounjaro cost include GP consultations?
No — private prescription fees are for the online consultation and medication supply only. If you're on the NHS or need ongoing GP support for monitoring, that remains separate. Many people combine private prescription access with periodic GP check-ins for blood pressure and metabolic monitoring, which may incur additional costs if done privately.
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.