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 on the NHS — What's Changed?
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through NHS specialist services and private prescribing. Like many medications, Mounjaro's cost has been subject to pricing adjustments. Understanding how NHS pricing works, what factors affect availability, and your options for accessing this medication can help you navigate the current landscape. This guide explains the situation clearly and covers what you need to know.
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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.
How NHS Mounjaro Pricing Works
The NHS negotiates drug prices centrally through the Department of Health and Social Care. Mounjaro (tirzepatide) pricing is set by Eli Lilly and reviewed periodically. Unlike some countries where individuals pay directly, NHS patients do not pay for medications prescribed through the NHS — prescription charges are flat-rate (currently £9.90 per item in England, though this varies by nation and exemptions apply).
However, regional availability and funding affect whether Mounjaro is prescribed. Some integrated care boards (ICBs) have stricter budget constraints, which can create waiting lists or limit access to tier 3 specialist weight management services where Mounjaro would typically be initiated. Price increases at the manufacturer level can influence NHS commissioning decisions and funding allocations.
- Mounjaro became available on NHS specialist services following NICE approval in 2023
- Access varies significantly across England, Scotland, Wales, and Northern Ireland
- Prescription costs to patients via NHS are capped at standard prescription charge rates
- Private pricing is set by individual prescribers and pharmacies and may reflect manufacturer costs
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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 Costs and Access Options
If you cannot access Mounjaro through NHS specialist services, or if waiting times are long, private prescription options are available through GPhC-registered online prescribing services. Private Mounjaro costs typically range from £129–£320 per month depending on dose — these prices may reflect Mounjaro's manufacturer cost increases. A licensed prescriber will assess your eligibility following an online consultation, and if approved, your prescription is dispensed by a regulated pharmacy.
Costs are not standardised across providers, so comparing options is worthwhile. Most private providers offer different doses at different price points, and some offer payment plans. Use our free BMI calculator and GLP-1 weight loss calculator above to check your eligibility and estimate potential costs before consulting a prescriber.
- 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.
Has Mounjaro's NHS price actually increased?
Mounjaro's manufacturer list price (set by Eli Lilly) has adjusted over time. The NHS negotiates prices centrally, so the price the health service pays may differ from private pricing. Individual NHS patients do not see these increases directly — prescription charges remain flat-rate. However, cost pressures can affect regional NHS availability and waiting lists.
Why is Mounjaro sometimes unavailable on the NHS?
Regional funding constraints, rather than price alone, often limit Mounjaro availability. Some ICBs have restricted tier 3 specialist services due to budget pressures. High demand for weight management treatment also creates waiting lists. Availability has improved since 2023 but remains inconsistent across the UK.
Is private Mounjaro more expensive than NHS?
Private Mounjaro costs are typically higher than NHS prescription charges, but costs vary by provider. Private prescribers set their own fees, and prices range from roughly £129–£320 per month depending on dose. NHS access is "free at point of care" (standard prescription charges only), but availability may require long waits.
Can I switch between NHS and private Mounjaro prescriptions?
Yes, you can switch between NHS and private prescriptions, though you should inform your GP or prescriber. If you start privately and later access Mounjaro through the NHS, your prescriber will manage the transition. Conversely, if NHS access becomes available, you can move to NHS provision.
What factors affect Mounjaro availability and cost in my area?
Your regional ICB funding, tier 3 specialist service capacity, and local commissioning priorities affect NHS availability. Private costs depend on your chosen provider and your dose. Ask your GP about NHS options first, check waiting times, and research private providers if you wish to access Mounjaro sooner. Use our BMI calculator to confirm your eligibility criteria.
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.