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 Price Going Up — Comparing Mounjaro and Wegovy in the UK
Mounjaro pricing has fluctuated in the UK private market, and many people wonder whether costs are increasing and how it compares to Wegovy. Both tirzepatide (Mounjaro) and semaglutide (Wegovy) are prescription-only weight management injections available in the UK through NHS specialist services or private prescribing. Understanding the pricing landscape alongside the clinical differences between these two medications can help you make an informed decision with your GP or prescriber. This guide explains the mechanisms, trial data, and what affects the cost of both treatments.
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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.
Clinical Evidence and How They Work Differently
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, meaning it activates two natural hormone pathways simultaneously. In the SURMOUNT-1 clinical trial, participants using Mounjaro lost an average of 20.9% of their body weight at the maximum 15 mg dose over 72 weeks, alongside a reduced-calorie diet and increased physical activity.
Wegovy (semaglutide) is a single GLP-1 receptor agonist. In the STEP-1 clinical trial, participants lost an average of 14.9% of their body weight at the maximum 2.4 mg dose over 68 weeks under similar lifestyle conditions.
Both medications slow gastric emptying and reduce appetite, but Mounjaro's dual mechanism may explain the slightly higher average weight loss in trials. However, individual results vary significantly—some people respond better to one medication than the other. Our GLP-1 weight loss calculator can help you explore potential outcomes at different dose levels.
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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.
Pricing and Eligibility Factors
Private Mounjaro pricing in the UK typically ranges from £129–£320 per month depending on dose. Wegovy private pricing is broadly similar. NHS access is free but requires referral to a tier 3 specialist weight management service, with significant regional variation in availability and waiting times.
Both medications require a BMI of 30 or above, or 27 or above with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. Eligibility is assessed individually by your prescriber—there is no automatic access based on BMI alone. Your GP can discuss which medication might suit your individual health profile, as prescriber preference, local commissioning, and individual response all influence which is recommended for you.
- 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.
Why does Mounjaro have higher average weight loss than Wegovy in trials?
Mounjaro activates both GIP and GLP-1 pathways, whereas Wegovy activates GLP-1 only. This dual mechanism may contribute to greater appetite suppression and weight loss in clinical trials. However, individual responses vary—some people achieve excellent results with Wegovy alone. Your prescriber will assess which is more suitable for you.
Is Mounjaro more expensive than Wegovy in the UK?
Private pricing is broadly similar for both medications, typically £129–£320 per month depending on dose. NHS access is free through specialist services but availability varies by region. Costs depend on dose, provider, and whether you access treatment privately or through the NHS. Ask your prescriber about current pricing options.
Can you switch from Mounjaro to Wegovy or vice versa?
Yes, switching is possible and sometimes necessary due to side effects, lack of response, or availability. Approximate dose equivalence is 5 mg Mounjaro ≈ 0.5 mg Wegovy and 15 mg Mounjaro ≈ 2.4 mg Wegovy. Any switch must be managed by your prescriber—never change medications without clinical guidance.
What does the NHS say about Mounjaro pricing and availability?
NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use in NHS specialist tier 3 weight management services. NHS pricing is not public, but treatment is free to patients. Availability varies significantly by region and ICB (Integrated Care Board). Contact your GP about local specialist services.
How can I estimate my potential weight loss with either medication?
Use our free GLP-1 weight loss calculator on this page to explore projected outcomes at different doses. This gives you a practical starting point for discussions with your prescriber. Remember that trial averages do not assures individual results—your actual weight loss will depend on diet, exercise, adherence, and individual response.
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.