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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Is Mounjaro Coming Down In Price In The UK?
Mounjaro (tirzepatide) pricing in the UK remains relatively stable, though costs vary depending on whether you access it through the NHS or private prescription. Currently, private Mounjaro costs range from £150–£300+ per month depending on dose and provider. Whether prices will drop significantly depends on market factors, patent status, and NHS commissioning decisions. This guide compares Mounjaro pricing with Wegovy and explains your access options 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.
Mounjaro vs Wegovy — Price And Clinical Trial Data
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only weight management injections available in the UK, but they differ in mechanism, dosing, and cost. Mounjaro is a dual GIP and GLP-1 receptor agonist — the dual mechanism may explain why SURMOUNT clinical trials showed average weight loss of 15–21% body weight. Wegovy is a GLP-1 receptor agonist only; STEP trials demonstrated approximately 15% average body weight loss. Private pricing for Mounjaro typically ranges from £150–£320 per month depending on dose (starting 2.5 mg up to 15 mg maximum), while Wegovy costs roughly £130–£250 monthly for the 0.25 mg to 2.4 mg dose range. Both require a prescription following clinical assessment from a licensed UK prescriber. Neither is currently available as a standard NHS prescription in most areas — access is through specialist weight management services with significant regional variation and waiting lists.
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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.
Will Mounjaro Prices Fall, And What Are Your Access Options?
Mounjaro pricing depends on several factors: patent protection (Eli Lilly's patent runs until approximately 2030), NHS NICE commissioning decisions, and market competition. Currently, private Mounjaro KwikPen access requires an online clinical assessment from a UK-licensed prescriber, then dispensing through a GPhC-registered pharmacy. Costs may gradually reduce over time as market maturity increases, but significant price drops are unlikely before patent expiration. NHS access to Mounjaro for weight management is expanding slowly through specialist tier 3 services, but availability remains inconsistent. Try our free GLP-1 weight loss calculator to project potential outcomes, and use the BMI calculator to assess your eligibility based on current NHS thresholds — both tools can help you discuss options with your GP.
- 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.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar — both range from £130–£320 monthly depending on dose and provider. Mounjaro's maximum dose (15 mg) costs more than Wegovy's maximum (2.4 mg), but entry-level doses are comparable. Final cost depends on your dose escalation pathway and specific pharmacy pricing.
Will Mounjaro prices come down in the UK?
Prices may reduce gradually as market competition increases, but significant drops are unlikely before patent expiration around 2030. NHS commissioning may affect availability and reduce costs for eligible patients, but private pricing remains manufacturer-controlled.
Can I get Mounjaro on the NHS in the UK?
Limited NHS access is available through specialist tier 3 weight management services in some regions. Eligibility requires BMI ≥30 or 27–29 with weight-related health conditions. Availability, waiting lists, and regional variation are significant — contact your local ICB for current status.
What is the difference between Mounjaro KwikPen and Wegovy for weight loss?
Mounjaro is a dual GIP+GLP-1 agonist; Wegovy is GLP-1 only. Clinical trials showed Mounjaro produced slightly higher average weight loss (15–21% vs 15%), but individual results vary. Both require prescription and clinical assessment; choice depends on prescriber recommendation and individual suitability.
How much does a month of Mounjaro cost privately in the UK?
Private Mounjaro typically costs £150–£320 monthly depending on dose. Starting dose (2.5 mg) is usually cheaper; maximum dose (15 mg) is more expensive. Prices vary by provider. Always request a full cost breakdown before starting treatment.
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.