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 10 mg Cost vs Wegovy — What You Need to Know
When comparing weight loss injections in the UK, cost is just one factor to consider alongside effectiveness, mechanism, and personal suitability. Mounjaro (tirzepatide) at 10 mg and Wegovy (semaglutide) are both prescription-only GLP-1-based medications available through NHS specialist services or private online prescription. Understanding how their costs, doses, and clinical trial results differ can help you discuss the right option with your prescriber. Both require a clinical assessment before prescription. Use our free GLP-1 weight loss calculator to explore how either medication might support your weight loss goals.
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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.
Mounjaro 10 mg vs Wegovy — Mechanism, Dosing, and Trial Data
Mounjaro (tirzepatide) at 10 mg is a dual GIP and GLP-1 receptor agonist — meaning it activates two hormone pathways that regulate appetite and blood sugar. In the SURMOUNT-1 clinical trial, tirzepatide 10 mg resulted in average weight loss of approximately 19.5% body weight over 72 weeks.
Wegovy (semaglutide) reaches its maximum dose of 2.4 mg — a single GLP-1 agonist that activates one pathway. In the STEP-1 trial, semaglutide 2.4 mg showed average weight loss of approximately 14.9% body weight over 68 weeks.
The dual mechanism of Mounjaro may contribute to its higher average weight loss, though individual results vary significantly. Both are once-weekly injections available as pre-filled pens (Mounjaro KwikPen and Wegovy auto-injection). Your prescriber will consider your personal health profile, medical history, and individual suitability when recommending which medication is appropriate for you.
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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.
Cost Comparison and UK Access Routes
Private prescription costs in the UK vary by provider and dose. Mounjaro 10 mg typically costs between £180–£280 per month through private online prescription services, whilst Wegovy at maximum dose ranges from £150–£250 monthly. NHS access is available through specialist tier 3 or 4 weight management services, though availability and waiting times vary significantly by region and integrated care board (ICB).
Neither medication is typically available through standard GP prescription — both require assessment by a specialist or licensed prescriber qualified in weight management. When you access either medication through a UK prescription, you'll receive specific guidance on storage (Mounjaro in the KwikPen, refrigerated at 2–8°C) and injection technique. Your prescriber will also discuss potential side effects and monitor your progress.
Individual suitability is determined by your prescriber, not cost. Both medications require eligibility assessment: you'll typically need a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. Ethnicity matters too — people of South Asian, Chinese, Black African, or Black Caribbean heritage may have lower BMI thresholds and could be eligible at BMI 27.5 or above. Your prescriber will review your medical history, current medications, and weight loss goals to recommend the most appropriate option. Track your progress if prescribed either medication using our free progress tracker, and discuss any concerns with your healthcare provider during regular check-ins.
- 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.
What's the difference between Mounjaro and Wegovy mechanisms?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, activating two appetite-regulating hormone pathways. Wegovy (semaglutide) is a GLP-1 agonist only, activating one pathway. Clinical trials suggest the dual mechanism of Mounjaro may result in higher average weight loss, though results vary between individuals.
How much does Mounjaro 10 mg cost per month in the UK?
Private prescription costs for Mounjaro 10 mg typically range from £180–£280 monthly in the UK, depending on the provider. NHS access is available through specialist weight management services, though regional availability varies. Always confirm exact pricing with your chosen UK pharmacy or prescriber.
Is Mounjaro or Wegovy available on the NHS?
Both are available through NHS specialist tier 3 or 4 weight management services, though access varies by region and integrated care board. Many people access them privately through UK-licensed online prescribers due to NHS waiting times. Your GP can refer you to specialist NHS services, or you can pursue private prescription following a clinical assessment.
How long does it take to reach Mounjaro 10 mg dose?
Mounjaro dose titration is gradual. Starting at 2.5 mg, you increase by 2.5 mg every 4 weeks: weeks 1–4 (2.5 mg), weeks 5–8 (5 mg), weeks 9–12 (7.5 mg), weeks 13–16 (10 mg). Reaching 10 mg typically takes 12–16 weeks. Your prescriber may adjust this timeline based on your tolerance and response.
Who is eligible for Mounjaro or Wegovy in the UK?
Adults with BMI 30 kg/m² or above, or BMI 27–29.9 kg/m² with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease) may be eligible. Lower thresholds apply for South Asian, Chinese, Black African, and Black Caribbean adults. Eligibility is determined following clinical assessment by 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.