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 10mg vs Wegovy — UK Price & Effectiveness Comparison
Looking for the best price on Mounjaro 10mg in the UK? Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only weight loss injections available through UK prescribers, but they differ in mechanism, dosing, and price. This guide compares both medications side-by-side so you can understand the differences and what to expect. Prices vary between providers, and individual suitability depends on your health profile — a clinical assessment is always required before prescription.
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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 Mounjaro 10mg and Wegovy Compare
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, meaning it activates two hormone pathways to regulate appetite and blood sugar. At 10mg, it's an escalation dose typically reached after 12 weeks of treatment. Wegovy (semaglutide) is a GLP-1 agonist only — it works on a single hormone pathway. The 10mg Mounjaro dose is closer to Wegovy's maximum 2.4mg dose in terms of effect, though they cannot be directly compared. In the SURMOUNT-1 clinical trial, Mounjaro 10mg produced average weight loss of approximately 19.5% of body weight over 72 weeks. Wegovy's STEP-1 trial showed average weight loss of around 14.9% at its maximum 2.4mg dose over 68 weeks. Both results were achieved alongside a reduced-calorie diet and increased physical activity — individual results vary significantly.
- Mounjaro: once-weekly injection, doses 2.5mg to 15mg
- Wegovy: once-weekly injection, doses 0.25mg to 2.4mg
- Both require minimum 4 weeks per dose before escalating
- Both are prescription-only and require a 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.
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Cost, Suitability & How to Access
Mounjaro 10mg and Wegovy prices in the UK vary by provider and dose. Private online prescribers typically charge £129–£320 per month depending on dose level — you can compare options before committing. NHS access is through specialist tier 3 weight management services (referral from your GP required), though availability is limited and waiting lists vary by region. Individual suitability depends on your BMI, health history, and any existing conditions. A prescriber will assess whether Mounjaro, Wegovy, or another approach is right for you. You can use our free BMI calculator above to check your starting point, and our GLP-1 weight loss calculator to explore potential outcomes at different doses.
- 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?
Prices vary between providers. Private prescribers typically charge £129–£320/month for either medication depending on dose. Mounjaro 10mg and Wegovy 2.4mg are not directly comparable in price — costs depend on your specific dose and provider. Always compare options before starting treatment.
Why does Mounjaro 10mg cause more weight loss than Wegovy?
Mounjaro uses dual GIP+GLP-1 mechanism versus Wegovy's single GLP-1 pathway. Clinical trials showed different average results, but individual outcomes vary greatly based on genetics, diet, exercise, and metabolism. A prescriber can advise which is more suitable for you.
Can I switch from Wegovy to Mounjaro 10mg?
Yes, switching is possible but must be managed by a prescriber — there is no official conversion chart. Approximate equivalence suggests Wegovy 1.7mg ≈ Mounjaro 10mg, but dosing decisions are individualised. Never switch medications without prescriber guidance.
Is Mounjaro available on the NHS in the UK?
NICE has approved tirzepatide (Mounjaro) for NHS specialist weight management services. Access is through tier 3 specialist teams via GP referral. Availability and waiting times vary significantly by region (ICB). Private access is available without NHS referral.
What if Mounjaro 10mg or Wegovy doesn't work for me?
Weight loss medications work differently for different people. If one isn't effective after 12+ weeks at the target dose, your prescriber may recommend adjusting dose, trying a different medication, or exploring other approaches like GLP-1 combined with lifestyle changes or other interventions.
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.