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 Codes and Costs in the UK
There are no official Mounjaro discount codes available in the UK. However, understanding how Mounjaro is accessed through the NHS or privately can help you find the most affordable route. Mounjaro (tirzepatide) is a prescription-only weight management injection available to eligible adults in the UK. Access depends on whether you pursue NHS specialist services or private prescription through a licensed UK prescriber. This guide explains your options, eligibility criteria, and realistic costs to help you make an informed decision.
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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.
NHS Access to Mounjaro and Eligibility Criteria
The NHS has approved tirzepatide (Mounjaro) for weight management through NICE guidance, but availability is limited to specialist tier 3 and tier 4 weight management services. Access is not through your standard GP appointment. You must be referred by your GP to a specialist weight management service in your region — these services are managed by Integrated Care Boards (ICBs).
You may be eligible if you have:
- BMI of 30 kg/m² or above, or
- BMI of 27–29.9 kg/m² with at least one weight-related health condition (type 2 diabetes, high blood pressure, sleep apnoea, cardiovascular disease)
- For South Asian, Chinese, Black African, or Black Caribbean adults: eligibility may start at BMI 27.5 or above due to higher health risks at lower weights
NHS prescription costs are £9.65 per item (standard prescription charge in England), regardless of dose. However, waiting lists for NHS specialist services can be very long — in some areas, several months to over a year. Regional availability also varies significantly.
Clinically BackedWeight Loss
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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 Prescribing and Costs
Private access to Mounjaro is available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. This route does not require an NHS referral. Private costs typically range from £129 to £320 per month depending on the dose — costs increase as you titrate up from 2.5 mg to 15 mg. Some private providers offer payment plans or package discounts for longer courses. Always verify the pharmacy is GPhC-registered before purchasing. Private prescribing allows faster access than NHS routes but requires you to pay directly. Use our free GLP-1 weight loss calculator to estimate potential results at different doses, and our BMI calculator to check your starting point.
- 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.
Are there real Mounjaro discount codes available in the UK?
No official discount codes exist for Mounjaro in the UK. Prices are set by licensed pharmacies. Some private providers offer package discounts when you commit to multiple months of treatment upfront, or payment plans to spread costs, but there are no "voucher" or "promo code" discounts. Always buy through registered UK pharmacies only.
How much does Mounjaro cost on the NHS?
NHS prescriptions cost £9.65 per item in England (standard prescription charge). This applies to any dose of Mounjaro. However, accessing Mounjaro on the NHS requires referral to a specialist tier 3 weight management service, which has limited availability and long waiting lists in many regions.
What's the difference between NHS and private Mounjaro costs?
NHS costs £9.65 per prescription (if you can access specialist services) but involves long waits. Private costs range from £129–£320 per month depending on dose but offers faster access without NHS referral. Private is more expensive upfront but quicker. NHS is cheaper but has significant waiting times and limited availability by region.
Can I get Mounjaro cheaper through patient assistance programmes?
Eli Lilly (the manufacturer) does not operate a formal UK patient assistance scheme for Mounjaro. Some private clinics offer payment plans or multi-month discounts. Check directly with GPhC-registered pharmacies about their pricing options, but there are no manufacturer rebates available.
Is Mounjaro available as a KwikPen in the UK, and does the format affect cost?
Yes, Mounjaro is supplied as a pre-filled KwikPen device in the UK at all doses. The format does not change the cost. Each KwikPen contains 4 weeks' worth of doses (one injection per week). Costs are per pen, regardless of the dose strength contained within it.
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.