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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Best Price For Mounjaro UK — Cost & Comparison Guide
If you're looking for the best price for Mounjaro in the UK, you'll need to understand that this is a prescription-only medicine, and cost depends on where you get it — NHS specialist services or private online prescribing. Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are weight loss injections licensed in the UK, but they differ in mechanism, dosing, and pricing. This guide explains what affects the cost of each, how to access them, and what to expect.
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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 Pricing Works in the UK
Mounjaro is available through two main routes in the UK:
- NHS specialist services: Free at point of care if prescribed through tier 3 or tier 4 weight management services. However, NHS access is limited by regional availability and specialist service capacity — many areas have long waiting lists.
- Private online prescribing: Costs typically range from £129 to £320 per month depending on the dose. Each KwikPen contains 4 weeks of injections (one dose per week), so monthly cost is your primary expense. Pricing varies between different GPhC-registered online pharmacies.
The Mounjaro dose affects cost — higher doses (10mg, 15mg) are more expensive than starting doses (2.5mg, 5mg). Most people titrate up gradually over several weeks, so initial costs are lower. Your GP cannot prescribe Mounjaro on the NHS except through specialist services; standard primary care prescriptions are not available. Private prescribers assess eligibility during an online consultation and issue a prescription if appropriate — you then pay the pharmacy price. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses.
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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 — Price & Clinical Differences
Both Mounjaro and Wegovy are prescription-only weight loss injections, but they differ in mechanism and cost. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — it activates two hormone pathways. Wegovy (semaglutide) is a GLP-1-only agonist. Clinical trials showed Mounjaro users lost an average of 15–21% of body weight, while Wegovy users lost approximately 15% — though individual results vary significantly.
Private pricing for Wegovy is typically similar to Mounjaro at comparable doses, ranging from £129 to £280 per month. Both require a clinical assessment by a UK-licensed prescriber before prescription. Neither is available as a standard NHS GP prescription — both require referral to specialist weight management services for NHS access. The "best price" depends on your individual eligibility, the dose your prescriber recommends, and which online pharmacy you choose.
- 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 typical cost of Mounjaro in the UK on the NHS?
Mounjaro is free when prescribed by NHS specialist tier 3 or tier 4 weight management services. However, NHS access is limited — waiting lists can be very long in many areas, and not all ICBs (Integrated Care Boards) commission the service equally. Your GP can refer you to your local specialist service, but availability varies significantly by region.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129 to £320 per month depending on the dose. Prices vary between GPhC-registered online pharmacies. Starting doses (2.5mg, 5mg) are cheaper than higher maintenance doses (10mg, 15mg). Each KwikPen provides 4 weeks of injections. Always check the specific price at your chosen pharmacy before consultation.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing for Mounjaro and Wegovy is very similar in the private market — both typically range from £129 to £280 per month depending on dose and pharmacy. The actual cost difference is usually minimal. Clinical trial data suggested Mounjaro may produce slightly greater average weight loss, but individual results vary. Your prescriber will recommend the most suitable option based on your health profile.
Can I get Mounjaro on prescription from my GP?
Standard GP prescription of Mounjaro in primary care is not available in the UK. Mounjaro is only available through NHS specialist tier 3 or tier 4 weight management services (by referral) or through private online prescribing following clinical assessment. Your GP can refer you to your local specialist service, but cannot prescribe it directly in most areas.
What affects the price I pay for Mounjaro?
The main factors are: (1) the dose — higher doses cost more; (2) the pharmacy — different GPhC-registered pharmacies set different prices; (3) whether you're on NHS or private; (4) your region (NHS availability varies). Starting doses are cheaper than maintenance doses. Use our GLP-1 calculator to understand your likely dose trajectory and discuss costs with your prescriber. ```
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