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- 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 Prices Increase in the UK — What's Changing?
Mounjaro (tirzepatide) prices have increased across UK private prescribing services in recent months. If you're considering this weight management injection, understanding the costs and why they're changing can help you make an informed decision. This guide explains the current pricing landscape, factors driving increases, and your options for accessing Mounjaro affordably in the UK.
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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.
Why Are Mounjaro Prices Rising?
Several factors are driving Mounjaro price increases across the UK:
- Manufacturing and supply costs — Eli Lilly has faced global supply chain pressures, particularly as demand for GLP-1 and dual GIP/GLP-1 medications has surged. Production costs have risen, and these costs are reflected in UK pricing.
- Increased demand — Mounjaro has become significantly more popular since its approval for weight management in the UK. Higher demand puts pressure on supply and pricing.
- Currency fluctuations — Mounjaro is manufactured in the US. Changes in the pound-to-dollar exchange rate directly affect UK pricing for imported medications.
- NHS and private sector dynamics — As more people seek private prescriptions due to NHS waiting lists, private providers have adjusted pricing to reflect market conditions.
- Regulatory costs — The medicine retains Black Triangle status (▼), meaning additional pharmacovigilance monitoring, which adds to operational costs for prescribing services.
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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.
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Current Mounjaro Pricing in the UK
Current private Mounjaro prices typically range from £129 to £320 per month, depending on dose and provider. Starting doses (2.5 mg) are generally cheaper; higher maintenance doses (15 mg) cost more. NHS access remains free but is limited to specialist tier 3/4 weight management services, with significant regional variation and waiting lists. Before starting Mounjaro, use our GLP-1 weight loss calculator to project potential outcomes, and try our free BMI calculator to check your eligibility threshold.
- 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.
What is the current price of Mounjaro in the UK?
Private Mounjaro costs range from approximately £129–£320 per month depending on dose. Starting doses (2.5 mg) cost less; higher doses (15 mg) cost more. NHS access is free but limited to specialist services with variable waiting times across regions.
Why has Mounjaro become more expensive?
Price increases reflect manufacturing costs, global supply chain pressures, increased demand, exchange rate changes, and additional regulatory monitoring. As a Black Triangle medicine, Mounjaro requires enhanced pharmacovigilance, adding operational costs.
Is Mounjaro available on the NHS, or is it only private?
Mounjaro is available on the NHS through specialist tier 3/4 weight management services, but access varies by region and involves waiting lists. Private prescribing is available immediately following an online clinical assessment.
How does Mounjaro pricing compare to Wegovy?
Wegovy (semaglutide) typically costs £129–£250 per month privately. Mounjaro is a dual GIP/GLP-1 agonist (vs Wegovy's single GLP-1 mechanism), and pricing is broadly similar, though individual provider pricing varies. Switching between medications requires prescriber guidance.
Can I reduce Mounjaro costs through NHS prescribing?
Yes — if eligible for NHS specialist weight management services, Mounjaro is free. Eligibility requires referral from your GP, assessment by a tier 3/4 service, and demonstration of medical need. Ask your GP about local specialist services and waiting times.
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.