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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Wegovy vs Mounjaro Cost in the UK
If you're considering GLP-1 weight loss injections in the UK, cost is a significant factor. Wegovy and Mounjaro are both prescription-only weight management medications, but they differ in pricing, mechanism, and how they're accessed on the NHS and privately. This guide breaks down the real costs, eligibility requirements, and what you can actually expect to pay depending on your route to treatment.
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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 Much Do Wegovy and Mounjaro Cost in the UK?
Private prescribing costs: On the private market, both medications are available through GPhC-registered online prescribers following a clinical assessment. Wegovy (semaglutide) typically costs £129–£289 per month depending on dose, while Mounjaro (tirzepatide) costs £149–£319 per month depending on dose and provider. These are approximate ranges — prices vary between providers. Both require initial consultations (usually £30–£50), and ongoing prescriber reviews are typically £20–£40 per appointment. Unlike some medications, these injections often have no additional pharmacy markup above the prescriber cost.
- Wegovy 0.25–0.5mg: typically £129–£169/month
- Wegovy 1mg–2.4mg: typically £199–£289/month
- Mounjaro 2.5–5mg: typically £149–£199/month
- Mounjaro 10–15mg: typically £249–£319/month
NHS access: If prescribed through the NHS, these medications are free at the standard prescription charge (currently £11.90 in England for those not exempt). However, NHS access is strictly limited to specialist tier 3/4 weight management services, and availability varies dramatically by region and waiting lists can be 6–18+ months in many areas.
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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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Key Differences: Mechanism, Doses, and Suitability
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — it activates two hormone pathways, which may explain slightly higher average weight loss in clinical trials (~20.9% at maximum dose in SURMOUNT-1). Wegovy (semaglutide) is a GLP-1-only agonist, with average weight loss of approximately 14.9% in STEP trials. Individual results vary significantly, and which medication suits you best depends on your personal health profile, not cost alone. Your prescriber will assess your eligibility, medical history, and other medications to recommend the most appropriate option. Try our free GLP-1 weight loss calculator to explore potential outcomes, and use the BMI calculator to understand your starting point before any consultation.
- 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 cheaper than Wegovy in the UK?
Costs are very similar — both typically range £129–£319/month depending on dose. Mounjaro may be slightly more expensive at higher doses, but differences are usually £20–£50/month. Price varies between private providers, so it's worth comparing. On the NHS, both are free at prescription charge.
Why is Mounjaro more expensive than Ozempic?
Mounjaro is a newer dual GIP+GLP-1 medication (tirzepatide), while Ozempic is semaglutide approved for diabetes, not weight management. Mounjaro's newer mechanism and weight-specific licensing justify higher pricing. Wegovy (also semaglutide, weight-specific) costs similar to Mounjaro.
Can I get Wegovy or Mounjaro free on the NHS in the UK?
Yes, if prescribed through an NHS specialist weight management service (tier 3/4), both are free at the standard prescription charge (£11.90 England). However, NHS access is limited, regional variation is significant, and waiting lists are often very long. Private access is faster but costs £129–£319/month.
What's included in the monthly cost of these injections?
The monthly cost covers the medication itself (4 weekly doses for both Wegovy and Mounjaro). Prescriber consultations (initial and ongoing reviews) are additional costs (£30–£50 initial, £20–£40 per review). Some providers bundle these; others charge separately.
Does insurance in the UK cover Wegovy or Mounjaro for weight loss?
Most private health insurance policies in the UK do not cover weight loss medications. Some may cover them if prescribed for diabetes-related indications, but weight management alone is rarely covered. Always check your specific policy. NHS prescription charges apply if accessed through the NHS.
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.