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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Cheapest Mounjaro 10mg in the UK — How It Compares to Wegovy
Finding affordable Mounjaro 10mg in the UK involves understanding both medication costs and effectiveness. While pricing varies between private prescribers, both Mounjaro (tirzepatide) and Wegovy (semaglutide) are available through NHS specialist services or private online prescription routes. This guide compares the two GLP-1 medications side-by-side, covering trial data, mechanisms of action, and practical considerations to help you understand which might suit your needs. Your prescriber will assess which is appropriate for your individual health situation.
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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 Trial Data and Mechanism Differences
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — it activates two hormone pathways rather than one. In the SURMOUNT-1 clinical trial, participants at the 10mg dose lost an average of approximately 19.5% of their body weight over 72 weeks, alongside reduced-calorie diet and increased physical activity. Individual results vary significantly.
Wegovy (semaglutide) is a GLP-1-only agonist, activating a single hormone pathway. In the STEP-1 trial, participants at the maximum 2.4mg dose achieved average weight loss of approximately 14.9% body weight over 68 weeks, again with lifestyle changes. The dual mechanism of Mounjaro may account for slightly higher average weight loss in trials, though prescriber choice depends on individual suitability, not trial averages.
- Mounjaro: dual GIP+GLP-1; 10mg typical mid-range dose
- Wegovy: GLP-1 only; 2.4mg is the maximum approved dose
- Both reduce appetite and support feeling fuller after meals
- Both require prescription and clinical assessment
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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
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Cost, Suitability, and NHS Access
Pricing for Mounjaro 10mg and Wegovy varies significantly across private prescribers in the UK, typically ranging from £129 to £320 per month depending on dose and provider. NHS access through specialist weight management services may be available but varies by region and often involves waiting lists. Use our free GLP-1 weight loss calculator to estimate potential results at different doses — both medications work best alongside reduced-calorie diet and increased physical activity.
Your GP or licensed prescriber will assess which medication suits your health profile, not simply the cheapest option. Factors include other medications you take, any existing health conditions, and individual response. Both are prescription-only and require clinical assessment before prescribing. Switching between them is possible but must be managed by your 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.
Is Mounjaro 10mg cheaper than Wegovy in the UK?
Costs vary between private prescribers. Mounjaro 10mg and Wegovy 2.4mg (maximum dose) typically fall in similar price ranges, £150–£300 monthly depending on provider. Direct price comparison isn't straightforward — individual prescriber pricing differs. Always check current costs with your chosen provider.
What's the main difference between Mounjaro and Wegovy?
Mounjaro is a dual GIP+GLP-1 agonist (two hormone pathways), while Wegovy is a GLP-1-only agonist (one pathway). This dual mechanism may explain Mounjaro's slightly higher average weight loss in trials, though both require healthy lifestyle changes for best results.
Can I get Mounjaro 10mg on the NHS in the UK?
Potentially, through specialist tier 3 weight management services, though availability varies significantly by NHS region and there are often substantial waiting lists. Private online prescription routes may offer faster access. Contact your GP to discuss NHS options in your area.
Which weight loss injection is better — Mounjaro or Wegovy?
Both are effective, and "better" depends on your individual health situation. Your prescriber will assess which suits you based on other medications, existing conditions, and contraindications. Trial data shows both support meaningful weight loss with lifestyle changes.
What's included in the "cheapest" Mounjaro cost?
Cost typically includes the medication and the prescription. Check whether your provider includes consultations, follow-ups, or side effect support. Some private providers bundle these; others charge separately. Compare full service offerings, not just medication price alone.
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.