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 Price Comparison in the UK
Mounjaro (tirzepatide) costs vary significantly depending on whether you access it through the NHS or privately in the UK. Understanding the pricing landscape, eligibility criteria, and what factors affect cost can help you make an informed decision about this prescription weight management medication. The price depends on your dose level, where you obtain your prescription, and regional NHS availability.
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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 Does Mounjaro Cost in the UK?
Private prescription costs: Mounjaro is typically available through private online prescribing services in the UK, with costs ranging from approximately £129 to £320 per month, depending on your dose and provider. A single KwikPen contains four weekly injections (one month's supply). Starting doses (2.5 mg) are usually less expensive than maintenance or escalation doses (10–15 mg). Private costs may also include the prescriber consultation fee, which varies by service.
- 2.5–5 mg doses: typically £129–£160/month
- 7.5–10 mg doses: typically £180–£240/month
- 12.5–15 mg doses: typically £240–£320/month
NHS access: Through the NHS, Mounjaro is free once prescribed, but access is limited to tier 3 specialist weight management services. Availability varies significantly by region (ICB), and waiting lists can extend several months to years in many areas. Not all NHS services currently offer tirzepatide — some regions still only offer other medications like liraglutide (Saxenda).
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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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What Affects Mounjaro Pricing?
Several factors influence the cost of Mounjaro: dose level is the primary driver — higher doses cost more because they contain more active ingredient. Provider choice affects pricing — different online prescribing services set their own fees, and some include consultations whilst others charge separately. Frequency of purchase may offer bulk discounts with some providers. Regional variation also exists — Scottish services may price differently to English ones. Always check whether your quoted price includes the prescriber consultation and any follow-up support. When comparing providers, consider the total cost including any add-on fees, not just the medication price. Use our free GLP-1 weight loss calculator to project potential outcomes at different doses — this may help justify the investment in a higher dose if clinically appropriate for you.
- 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 available on the NHS in the UK?
Yes, Mounjaro (tirzepatide) has been approved by NICE for NHS use within specialist tier 3 weight management services. However, availability varies significantly by region. Access is not through standard GP prescription — you must be referred to a specialist service. Waiting lists are often lengthy. Check with your local Integrated Care Board (ICB) to see if tirzepatide is available in your area.
How much does a month's supply of Mounjaro cost privately?
Private Mounjaro costs typically range from £129 to £320 per month depending on dose. A KwikPen contains four weekly injections (one month's supply). Starting doses (2.5–5 mg) cost less than escalation doses (10–15 mg). Always confirm whether the quoted price includes the prescriber consultation or if that's an additional fee.
Can I get Mounjaro cheaper through the NHS than private services?
Once prescribed through the NHS, Mounjaro is free. However, NHS access is limited to specialist services with variable availability and long waiting lists in many regions. If you can access NHS tirzepatide quickly in your area, it will be free; otherwise, private prescription may be faster, though more expensive upfront.
Do different private providers charge different prices for the same dose?
Yes. Different online prescribing services and pharmacies set their own pricing for Mounjaro. Prices vary by £30–£50 per month for the same dose. Some providers include consultation fees in the quoted price; others charge separately. Always compare total cost, not just medication price, and check reviews before choosing a provider.
How does Mounjaro price compare to Wegovy?
Both tirzepatide (Mounjaro) and semaglutide (Wegovy) are available privately in the UK at similar price points — typically £129–£320/month depending on dose. Mounjaro's dual GIP+GLP-1 mechanism may offer different results than Wegovy's single GLP-1 action, though both have NHS approval. Individual response varies. Your prescriber can help determine which is more suitable for you.
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