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 Price Increase — What You Need to Know
Mounjaro (tirzepatide) prices in the UK have risen significantly since its launch, reflecting supply demand and manufacturing costs. Whether you're accessing treatment through the NHS or privately, understanding current pricing, eligibility criteria, and your options is essential. This guide explains what's driving costs, how prices compare, and the realistic cost of accessing this prescription-only weight management injection in the UK today.
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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.
UK Mounjaro Pricing — Private and NHS Routes
Private prescription costs for Mounjaro in the UK typically range from approximately £150 to £350 per month, depending on your dose level. The 2.5 mg starting dose is usually at the lower end, while higher maintenance doses (10–15 mg) cost more. Prices vary between different online prescribing services and pharmacies, as they set their own rates. A full treatment course over 12 months could cost £1,800 to £4,200 privately.
NHS access is through tier 3 specialist weight management services following a GP referral. If prescribed on the NHS, Mounjaro is provided at standard NHS prescription costs (currently £11.65 per item in England for eligible patients). However, NHS availability varies significantly by region and integrated care board (ICB). Many areas have substantial waiting lists or limited access, and not all regional services offer tirzepatide yet. Your GP can advise whether your local NHS service provides Mounjaro and your eligibility.
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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.
Why Has Mounjaro Become More Expensive?
Mounjaro price increases reflect several factors:
- Growing global demand exceeding supply in the first years after launch
- Manufacturing scale-up and production costs
- Currency fluctuations affecting import costs into the UK
- Regulatory and distribution expenses
- Increased clinical demand as awareness grows
Wegovy (semaglutide), the alternative GLP-1 injection, generally costs slightly less privately than Mounjaro but faces similar supply pressures. Use our free GLP-1 weight loss calculator to compare potential outcomes between different doses and medications before committing to treatment.
Private prescribing services require an online consultation with a UK-licensed prescriber who will assess your eligibility based on BMI, health conditions, and medical history. If approved, your prescription is sent to a GPhC-registered pharmacy for dispensing. This route bypasses NHS waiting lists but requires you to cover the full cost. Always use services registered with the General Pharmaceutical Council to ensure you're receiving safe, legitimate treatment from qualified prescribers.
- 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 in the UK privately?
Private Mounjaro costs typically range from £150–£350 per month depending on your dose, with annual costs around £1,800–£4,200. Prices vary between different online prescribing services and pharmacies, so comparing providers is worthwhile before starting treatment.
Is Mounjaro cheaper on the NHS?
Yes. On the NHS, Mounjaro costs £11.65 per prescription item for eligible patients. However, NHS access is limited to specialist tier 3 weight management services, and waiting lists can be very long. Many regions have restricted or no access to tirzepatide currently.
Why is Mounjaro so expensive?
Costs reflect high global demand, manufacturing expenses, supply chain factors, and regulatory requirements. As a newer dual GIP/GLP-1 medication, tirzepatide is more complex to produce than older weight loss drugs, contributing to higher pricing.
Can I get Mounjaro cheaper than private prescription prices?
Only through NHS prescription if referred to a specialist service and approved. Private prices are set by individual prescribing services. Comparing different providers may reveal better rates, but significant discounts below £150/month are unlikely at current market prices.
What's the difference between Mounjaro and Wegovy pricing?
Wegovy (semaglutide) typically costs slightly less privately than Mounjaro, roughly £120–£300 per month depending on dose. Both face similar supply pressures. Our GLP-1 weight loss calculator can help you explore outcomes with either medication.
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.