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
Is The Price Of Mounjaro Going Down In The UK?
Mounjaro (tirzepatide) pricing in the UK varies depending on whether you access it through the NHS or privately. While we can't predict future price movements, understanding current costs and how they compare to alternatives like Wegovy can help you make informed decisions. This guide explains how NHS and private pricing works, what affects costs, and how the two main weight loss injections compare. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses, and talk to your prescriber about what's most suitable for your situation.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
How Mounjaro And Wegovy Pricing Compare In The UK
NHS access: Mounjaro is available through NHS tier 3 specialist weight management services, but availability and waiting times vary significantly by region. If prescribed through the NHS, you pay standard prescription charges (currently £9.90 per item in England if eligible, or free if exempt).
Private pricing: Through private online prescribing services, Mounjaro typically costs between £150–£250 per month depending on the dose. The Mounjaro KwikPen contains four doses (four weeks supply), so costs reflect the dose strength you're prescribed.
Wegovy comparison: Wegovy (semaglutide) private pricing is broadly similar, ranging from £129–£250 per month depending on dose. Both are once-weekly GLP-1 (or GIP+GLP-1) injections with comparable private market pricing. Tirzepatide in Mounjaro has a dual mechanism (GIP + GLP-1 agonist), whilst Wegovy is a single GLP-1 agonist only — this may influence prescriber choice but does not significantly affect UK pricing parity.
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.
What Affects Mounjaro Costs And Availability
Mounjaro pricing is influenced by supply, demand, MHRA approval status (currently under additional monitoring with Black Triangle ▼), and NHS commissioning decisions. Prices in the private market are set by individual pharmacies and prescribing services, so shopping around can reveal cost variations. Some services offer subscription models that reduce per-dose costs. NHS availability depends on local Integrated Care Board (ICB) budgets and tier 3 service capacity — in many regions, waiting lists for NHS-prescribed weight loss treatment remain very long. Your prescriber will assess your eligibility and discuss which option suits your health needs and circumstances. Use the BMI calculator on this page to check your starting point, and our free progress tracker to monitor outcomes once treatment begins.
- 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.
Will Mounjaro prices fall in the UK soon?
We can't predict future pricing. Mounjaro costs depend on supply, demand, and NICE/NHS commissioning decisions. Private pricing is set by individual services and pharmacies, so costs can vary. Monitor your local NHS services or speak to your prescriber about current availability in your area.
Is Mounjaro cheaper than Wegovy on the NHS?
On the NHS, both are charged at standard prescription rates if prescribed through specialist services. Private pricing is broadly comparable between Mounjaro and Wegovy (both £129–£250/month depending on dose). Your GP will not determine which is "cheaper" — prescriber choice is based on clinical suitability and your individual health profile.
Why does Mounjaro cost more than some other weight loss injections?
Mounjaro is a newer dual GIP+GLP-1 medication, which affects its market pricing. Older GLP-1-only options like liraglutide (Saxenda) may have lower private costs. NHS pricing is standardised via prescription charges. Cost should not be your only factor — clinical effectiveness and suitability matter most.
Can I get Mounjaro free on the NHS?
Yes, if prescribed through an NHS tier 3 specialist weight management service. You'd pay standard prescription charges (or free if exempt). Access varies by region — ask your GP about referral to your local specialist weight management service. Waiting times can be long in some areas.
How do I know which is better value — Mounjaro or Wegovy?
Both are prescription-only and require clinical assessment. Your prescriber will recommend based on your health, not cost. In clinical trials, Mounjaro showed slightly higher average weight loss (15–21% body weight) vs Wegovy (around 15%), but individual results vary greatly. Discuss options and costs with your prescriber.
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.