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
Free tracker included with every download this week
How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. Private prescription costs typically range from £129 to £320 per month depending on your dose, whilst NHS access is free at the point of prescribing but availability is extremely limited and varies by region. Understanding both routes and what affects the cost can help you make an informed decision about weight management treatment. Use our free GLP-1 weight loss calculator to explore projected outcomes before considering treatment 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.
Private Mounjaro Costs in the UK
Private prescription pricing for Mounjaro in the UK typically follows this structure:
- Starting doses (2.5 mg–5 mg): approximately £129–£180 per month
- Mid-range doses (7.5 mg–10 mg): approximately £200–£260 per month
- Higher doses (12.5 mg–15 mg): approximately £280–£320 per month
Each KwikPen contains 4 doses (4 weeks' supply). Prices vary between GPhC-registered online pharmacies depending on their operating costs and sourcing. Some providers offer subscription discounts or multi-month packages that reduce the per-dose cost. Always verify you're using a GPhC-registered pharmacy to ensure the medication is genuine and safe. Compare private prescribing services to find competitive rates, but remember that the cheapest option isn't always the safest — regulatory compliance matters more than the lowest price.
Clinically BackedWeight Loss
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 vs Private Access: Route Comparison
NHS access to Mounjaro is free but highly restricted. It's only available through specialist tier 3 weight management services following a GP referral. Waiting lists can be months or years in many regions, and availability varies significantly by Integrated Care Board (ICB). Some areas have no current access at all.
Private access is faster — typically within days of online consultation — but costs £129–£320 per month depending on your dose. You'll need a UK-licensed prescriber to complete an online clinical assessment. Private treatment requires you to self-fund, whilst NHS treatment (if you can access it) is free. Your GP can discuss both options and advise which route is most suitable for your individual health needs.
- 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.
Can I get Mounjaro on the NHS in the UK?
Yes, but access is severely restricted. It's only available through specialist tier 3 weight management services with a GP referral, and many regions have long waiting lists or no current availability. Contact your local ICB to check eligibility and waiting times.
What's included in the Mounjaro private prescription cost?
The quoted price is typically for the KwikPen only. You may also need to pay a consultation fee (usually £40–£75) for the initial clinical assessment and ongoing prescriber fees if required. Always check the total cost upfront before ordering.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar — both typically cost £129–£320 per month privately depending on dose. Mounjaro may be slightly more expensive at higher doses because the maximum dose (15 mg) is stronger than Wegovy's maximum (2.4 mg). Compare specific providers for current pricing.
What happens if I stop paying for Mounjaro treatment?
If you stop your private prescription, you'll simply discontinue treatment. There's no contractual obligation to continue. However, stopping suddenly after reaching a stable dose isn't ideal — discuss discontinuation with your prescriber to minimise potential weight regain.
Does the cost of Mounjaro include GP follow-up?
No. Private Mounjaro prescriptions don't include NHS GP monitoring. You're responsible for arranging any health monitoring with your GP, though many GPs will review you if you ask. Your private prescriber can provide support, but ongoing care is separate from the medication 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.