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 Discounts in the UK: How It Compares to Wegovy
If you're considering Mounjaro for weight management in the UK, cost is an important factor. Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only weight loss injections available through NHS specialist services and private prescribers. Understanding the pricing differences, available discounts, and how to access each medication can help you make an informed decision alongside your healthcare provider.
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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 and Wegovy Pricing Compare in the UK
Mounjaro pricing typically ranges from £129 to £320 per month depending on your dose, with costs generally increasing as you escalate from 2.5mg to the maximum 15mg once-weekly injection. Wegovy pricing generally falls in a similar range, though some providers offer slightly different pricing structures. Both medications require monthly repeat prescriptions, and costs accumulate over time if you continue treatment. NHS access to both medications is through specialist tier 3 weight management services—access is free but involves waiting lists that vary significantly by region. Private prescribers often offer package discounts when purchasing multiple months in advance, and some providers run promotional pricing at specific times of year. It's essential to use our GLP-1 weight loss calculator to project potential costs alongside expected results at your intended dose, as this helps contextualise the investment in your weight loss journey.
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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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Mounjaro vs Wegovy: Clinical Data and Individual Suitability
The SURMOUNT-1 trial showed Mounjaro (tirzepatide) achieved average weight loss of approximately 20.9% at the maximum 15mg dose, whilst the STEP-1 trial showed Wegovy (semaglutide) achieved approximately 14.9% at 2.4mg. However, individual results vary significantly—some people respond better to one medication than the other. Mounjaro is a dual GIP and GLP-1 receptor agonist, whilst Wegovy is a GLP-1-only agonist, which may explain different response rates. Your prescriber will assess which medication suits your health profile, existing conditions, and medical history. Both require a clinical assessment before prescription, and both should be combined with dietary changes and increased physical activity for best results. Cost alone should not be the deciding factor—clinical suitability is paramount.
- 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 is the average cost of Mounjaro in the UK privately?
Private Mounjaro costs typically range from £129 to £320 per month depending on your dose level. Starter doses (2.5mg–5mg) are usually at the lower end, whilst higher doses (10mg–15mg) cost more. Many providers offer discounts for purchasing 3 or 6 months in advance, potentially reducing the per-month cost.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is broadly similar between Mounjaro and Wegovy, with both generally ranging £129–£320 monthly depending on dose and provider. Direct price comparison is difficult as different prescribers set different rates. It's worth comparing quotes from multiple providers, but clinical suitability should guide your choice more than cost.
Can you get Mounjaro free on the NHS in the UK?
Yes, Mounjaro can be prescribed free through NHS specialist tier 3 weight management services if you meet eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions). However, waiting times vary significantly by region, and access is not assured everywhere. Private prescription is faster but costs £129–£320 monthly.
What's the difference between Mounjaro and Wegovy mechanism?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, activating two hormone pathways. Wegovy (semaglutide) activates GLP-1 only. This dual mechanism may explain why clinical trials showed Mounjaro achieved slightly higher average weight loss, but individual responses vary—some people respond better to Wegovy.
How can I estimate my Mounjaro costs before starting?
Use our free GLP-1 weight loss calculator to project your intended starting dose and escalation plan, then multiply monthly cost by the expected duration. Most people spend 3–6 months escalating doses before reaching maintenance. Factor in lifestyle changes and use our progress tracker to monitor results alongside costs.
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.