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 Wegovy Cheaper Than Mounjaro in the UK?
Both Wegovy and Mounjaro are prescription-only weight management injections available in the UK, but their costs differ significantly depending on where you access them. Neither medication is routinely available on the NHS — most UK adults access them through private prescribing. The price you pay depends on the dose, the provider, and whether you're using NHS specialist services (if available) or private online prescribing. Understanding the cost differences can help you make an informed choice about which medication might suit your needs and budget.
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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 UK Pricing Compares Between Wegovy and Mounjaro
Wegovy (semaglutide) typically costs between £129 and £280 per month in the UK through private online prescribing, depending on your dose. The dose range is 0.25 mg to 2.4 mg once weekly. Mounjaro (tirzepatide) generally costs between £149 and £320 per month privately, with doses ranging from 2.5 mg to 15 mg once weekly. The actual price varies by provider and dose — lower doses cost less, and higher maintenance doses cost more. Key cost factors include:
- Your current dose level (starting doses are cheaper than maximum doses)
- The online prescribing provider you choose (prices vary between services)
- Whether you need dose escalation over time (which increases monthly cost)
- Bulk purchasing options some providers offer
On average, Mounjaro tends to be slightly more expensive than Wegovy, particularly at maximum maintenance doses, though the gap is relatively small — typically £10–40 per month depending on the provider and dose.
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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.
Why Does the Cost Differ and What About NHS Access?
The price difference reflects the different mechanisms: Mounjaro is a dual GIP and GLP-1 receptor agonist, whilst Wegovy is a single GLP-1 agonist only. This complexity in manufacturing and formulation can affect cost. Neither medication is routinely funded by the NHS for weight management — access through NHS specialist tier 3 weight management services varies by region and can involve significant waiting lists. If you qualify for NHS access in your area, the cost would be covered, but availability is limited. Most UK adults currently access these medications through private prescribing, where cost is your responsibility. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different dose levels, and discuss costs directly with your prescriber when considering which medication suits your budget.
- 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 always more expensive than Wegovy in the UK?
Generally yes, but the difference is small — typically £10–40 per month depending on dose and provider. At starting doses, costs are closer. Price varies by online prescribing service, so comparing quotes is worthwhile before committing.
Can I get Wegovy or Mounjaro free on the NHS?
Neither is routinely available on the NHS for weight management. Access through NHS specialist services varies by region and availability is limited. Most UK adults access them privately. Ask your GP about NHS tier 3 services in your area.
Which is cheaper at the maximum dose?
Mounjaro typically costs more at maximum dose (15 mg) — usually £280–320 per month. Wegovy at 2.4 mg costs around £220–280 per month. However, prices vary between providers, so request quotes.
Why does Mounjaro cost more if it's more effective?
Mounjaro is a dual GIP+GLP-1 medication, which is more complex to manufacture. Clinical trials showed greater average weight loss, but both medications are effective. Cost reflects formulation complexity, not superiority alone.
What affects the monthly cost of either injection?
Your current dose (starting doses are cheaper), the online prescriber you use (prices vary by provider), dose escalation schedule, and any bulk purchase discounts. Get quotes from multiple UK providers before deciding.
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.