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 1.7 Mg vs Mounjaro — UK Pricing & Access Guide
Wegovy 1.7 mg is approximately equivalent to Mounjaro 10 mg in terms of weight loss effect, though individual results vary significantly. Both are prescription-only GLP-1 and GIP/GLP-1 receptor agonist medications licensed for weight management in the UK. Understanding the cost and access routes for each — whether through NHS specialist services or private prescription — helps you make an informed decision. This guide explains how both medications work, their approximate dose equivalence, typical UK costs, and how to access them.
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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.
UK Private Prescription Costs for Wegovy and Mounjaro
Both Wegovy and Mounjaro are available privately in the UK through online prescribing services. Wegovy costs typically range from £129 to £199 per month depending on your dose and the provider you use. Mounjaro generally costs £149 to £320 per month, reflecting its dual GIP/GLP-1 mechanism and potentially higher clinical efficacy in trials.
At the 1.7 mg Wegovy dose, you can expect to pay around £160–£180 monthly through most UK private providers. The equivalent Mounjaro 10 mg dose typically costs £200–£250 per month. Prices vary between providers because they cover different overheads and clinical assessment models. When comparing costs, remember that you will need an online consultation with a UK-licensed prescriber (usually £40–£80) before your first prescription, and this may not always be included in quoted prices.
NHS access is free if eligible, but availability is extremely limited and varies by region. Most UK adults seeking weight loss treatment currently access these medications privately due to long NHS waiting lists.
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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.
NHS vs Private Routes — How to Access in the UK
NHS route: You would need referral from your GP to a tier 3 specialist weight management service in your area. Access is limited to adults with BMI ≥30 (or ≥27 with weight-related health conditions) and only where local services are available. Waiting lists often exceed 6 months in many regions; some areas have no tier 3 services. Your GP can advise if your local integrated care board commissions specialist weight management services.
Private route: Complete an online health questionnaire and virtual consultation with a UK-licensed prescriber (20–30 minutes). If approved, your prescription is sent to a GPhC-registered pharmacy and delivered to your home. This typically takes 3–5 working days from consultation to delivery. You remain in control of your dose escalation, though you should follow clinical guidance.
Use our GLP-1 weight loss calculator to estimate potential weight loss at different doses and see if either medication aligns with your goals.
- 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 Wegovy 1.7 mg equivalent to Mounjaro 10 mg?
Yes, approximately. Based on clinical experience and SURMOUNT/STEP trial data, Wegovy 1.7 mg and Mounjaro 10 mg produce similar average weight loss of around 15–19% body weight. However, individual results vary significantly. Mounjaro's dual mechanism (GIP + GLP-1) may produce slightly better outcomes in some people, though direct head-to-head trials are limited. Your prescriber can advise which is more suitable.
How much does Wegovy cost privately in the UK?
Wegovy 1.7 mg costs approximately £160–£180 per month through UK private prescribing services, plus an initial online consultation fee (£40–£80). Exact prices vary by provider. The lowest dose (0.25 mg) is cheaper at around £129–£150/month, while the maximum dose (2.4 mg) costs £180–£199/month. Always confirm prices with your chosen provider before committing.
Can I get Wegovy or Mounjaro free on the NHS in the UK?
Yes, both are available on the NHS, but access is very limited and varies by region. You need referral to a specialist tier 3 weight management service, a BMI of 30 or above (or 27–29.9 with weight-related health conditions), and your local integrated care board must commission the service. Waiting times are often 6–12 months or longer. Ask your GP whether your area offers NHS weight management services.
What's the difference between a Mounjaro KwikPen prescription and Wegovy?
Both come as pre-filled injection pens. Mounjaro is the KwikPen (4 weeks supply per pen, once-weekly 2.5–15 mg doses). Wegovy is a similar pre-filled auto-injection pen (once-weekly, 0.25–2.4 mg doses). The KwikPen and Wegovy pen designs are slightly different but function similarly. Mounjaro typically escalates faster (higher maximum dose) and may have a stronger effect, whereas Wegovy has a gentler dose titration.
What happens if I switch from Wegovy to Mounjaro?
Any switch between medications must be managed by your prescriber — there is no official established conversion chart. The approximate equivalences (Wegovy 1.7 mg ≈ Mounjaro 10 mg) are clinical guidance only, not formal protocols. Your prescriber will likely restart you on a low Mounjaro dose and titrate up, as the dual mechanism requires careful individual assessment. Never switch medications without prescriber guidance.
Ready to take control of your weight loss journey?
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