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 Discount & Cost Options in the UK
If you're searching for Mounjaro discounts or pricing information in the UK, it's important to understand how tirzepatide is accessed through both NHS and private routes. Mounjaro is a prescription-only, once-weekly injectable medicine for weight management, and cost depends significantly on whether you access it through NHS specialist services or private online prescribing. This guide explains UK eligibility, pricing, and how to explore your options.
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Calculate Your BMI Instantly
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.
NHS Access and Eligibility for Mounjaro in the UK
NICE has approved tirzepatide (Mounjaro) for use within NHS specialist weight management services in England, though access varies significantly by region and local healthcare commissioning decisions. You cannot obtain Mounjaro through a standard GP prescription — it is only available through tier 3 or tier 4 specialist weight management services.
- Eligibility: Adults with a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions (type 2 diabetes, prediabetes, hypertension, sleep apnoea, or cardiovascular disease history)
- Lower thresholds apply for South Asian, Chinese, Black African, or Black Caribbean adults (from BMI 27.5 kg/m²)
- NHS route: GP referral to local tier 3 weight management service; assessment and prescription follow if clinically appropriate
- Waiting lists: Significant delays in many regions; some areas have waiting lists of 6–18 months or longer
NHS Mounjaro is free at point of delivery (standard prescription charge applies in some regions), but access depends on your local integrated care board (ICB) commissioning and service availability.
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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.
Private Mounjaro Access and Costs in the UK
Private access to Mounjaro in the UK is available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. Private Mounjaro costs range from approximately £129–£200+ per month depending on your starting dose (2.5 mg) and whether you progress to maintenance doses (5 mg, 10 mg, 15 mg). Costs typically increase as you titrate to higher doses.
Private prescribing offers faster access — often within days of assessment — but requires paying out of pocket. Some patients use our free GLP-1 weight loss calculator to compare potential outcomes and costs between Mounjaro and alternatives like Wegovy (semaglutide). Combined with lifestyle changes, this helps you make an informed decision about which route and medication suits your circumstances and budget.
- 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.
How much does Mounjaro cost on the NHS in the UK?
Mounjaro is free on the NHS through specialist tier 3 weight management services (standard prescription charge applies in some regions). However, NHS access is limited by regional commissioning and waiting lists can be very long. Not all ICBs fund tirzepatide, and availability varies significantly across the UK.
Can my GP prescribe Mounjaro directly?
No. Mounjaro is only available through NHS specialist weight management services (tier 3 or tier 4), not standard GP prescription. You need a GP referral to your local specialist service, which then assesses eligibility and prescribes if appropriate.
What does private Mounjaro cost per month in the UK?
Private Mounjaro costs typically range from £129–£200+ per month depending on your dose and provider. Starting doses (2.5 mg) are cheaper than maintenance doses (10 mg, 15 mg). Costs are paid out of pocket — private prescriptions are not covered by the NHS.
Is there a Mounjaro discount or patient assistance programme in the UK?
Mounjaro does not have an official UK patient assistance or discount programme. Prices vary slightly between private providers. Your best option is to compare costs across GPhC-registered pharmacies and discuss NHS specialist referral with your GP if you meet eligibility criteria.
How long is the NHS waiting list for Mounjaro in the UK?
NHS waiting times for specialist weight management services vary dramatically by region (ICB). Some areas have waiting lists of 6–18 months or longer. Contact your local tier 3 service through your GP referral to check current waiting times in your area.
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.