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 Pricing in the UK — What You'll Pay for Tirzepatide
Mounjaro (tirzepatide) is a prescription-only weight loss injection available in the UK through private prescribers and NHS specialist services. The cost of Mounjaro varies significantly depending on your dose, the provider, and whether you access it through the NHS or privately. This guide explains UK Mounjaro pricing, how it compares to Wegovy, and what affects the total cost of your treatment. Use our free GLP-1 weight loss calculator to estimate potential results and compare treatment options for your circumstances.
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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.
Mounjaro vs Wegovy — UK Pricing and Mechanism Comparison
Mounjaro (tirzepatide) typically costs between £129 and £320 per month in the UK through private prescribers, depending on the dose strength. The starting 2.5 mg dose is usually at the lower end of this range, while the maximum 15 mg dose costs more. Wegovy (semaglutide) costs roughly £140–£300 per month for private prescriptions, with similar variation by dose.
- Mounjaro mechanism: Dual GIP + GLP-1 receptor agonist — activates two hormone pathways
- Wegovy mechanism: GLP-1 receptor agonist only — single hormone pathway
- Clinical trial weight loss: Mounjaro showed average weight loss of 15–21% body weight; Wegovy showed approximately clinically studied weight loss
- Injection frequency: Both are once-weekly injections
- Dosing schedules: Mounjaro starts at 2.5 mg with increments every 4 weeks; Wegovy starts lower at 0.25 mg with gentler escalation
Neither price difference nor trial data should drive the choice — suitability depends on your individual health profile, which your prescriber will assess.
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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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NHS vs Private Access — Pricing and Availability in the UK
NHS access: Mounjaro is approved by NICE for use within specialist tier 3 and tier 4 weight management services. If you qualify and are referred by your GP, the NHS covers the cost entirely — you pay only the prescription charge (currently £9.90 in England). However, NHS availability varies significantly by region, and waiting times can be months or years in many areas.
Private access: Available without NHS referral through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber. Private prescriptions cost £129–£320 per month depending on dose. This option provides faster access but requires you to pay the full cost. Use our BMI calculator to check your eligibility before consulting a prescriber.
- 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.
How much does Mounjaro cost per month in the UK privately?
Private Mounjaro prescriptions in the UK cost between £129 and £320 per month depending on the dose. Starting doses (2.5–5 mg) are typically at the lower end; maximum doses (10–15 mg) cost more. Prices vary slightly between providers. NHS prescriptions cost only the standard prescription charge (£9.90 in England) if you access treatment through a specialist weight management service.
Is Mounjaro cheaper than Wegovy in the UK?
Mounjaro and Wegovy have broadly similar UK pricing, ranging from approximately £129–£300 per month depending on dose and provider. Direct price comparison varies between pharmacies. The choice between them should be based on clinical suitability and what your prescriber recommends, not cost alone. Both require a prescription and clinical assessment.
What's the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP + GLP-1 receptor agonist; Wegovy (semaglutide) is a GLP-1 agonist only. SURMOUNT trials showed Mounjaro users lost an average of 15–21% body weight; STEP trials showed Wegovy users lost approximately 15%. Both are once-weekly injections. Your prescriber will assess which is more suitable based on your health profile.
Can I get Mounjaro free on the NHS in the UK?
Yes — Mounjaro is approved by NICE and available through NHS specialist weight management services. If you qualify (BMI 30+ or BMI 27+ with weight-related health conditions) and are referred by your GP to a tier 3 service, the NHS covers the full cost. You pay only the prescription charge (£9.90 in England). Availability and waiting times vary significantly by region.
What affects the price of Mounjaro in the UK?
Mounjaro pricing depends on the dose strength (2.5 mg to 15 mg), your provider (NHS vs private), and whether you access it through a specialist service or online prescriber. Each KwikPen contains 4 weekly doses. Private prices range from £129–£320/month; NHS prescriptions cost the standard charge if you access specialist services. Your prescriber will determine which dose is appropriate.
Ready to take control of your weight loss journey?
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