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
Free tracker included with every download this week
How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS specialist services and private online prescribing. The cost varies significantly depending on whether you access it through the NHS or privately, and the specific dose you're prescribed. Understanding the pricing structure helps you make informed decisions about this treatment option alongside lifestyle changes like diet and physical activity.
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Calculate Your BMI Instantly
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 Costs — NHS vs Private Routes
NHS Access: Mounjaro is available through NHS tier 3 specialist weight management services following NICE approval, though access varies significantly by region and waiting lists can be lengthy. When prescribed through the NHS, there is no medication cost — you pay only the standard NHS prescription charge (currently £9.90 per item in England, or free if eligible).
Private Access: Through GPhC-registered online pharmacies, Mounjaro costs typically range from £150–£300+ per month depending on dose strength. The 2.5 mg starting dose is usually the least expensive, while higher doses (10 mg, 15 mg) cost more. Each KwikPen contains 4 weekly doses, lasting one month. A full dose titration course from 2.5 mg to 15 mg over approximately 20 weeks costs significantly more than maintenance doses. Private prescribing also includes the prescriber consultation fee, typically £30–£80.
- 2.5 mg and 5 mg doses: approximately £150–£200 per month
- 7.5 mg and 10 mg doses: approximately £200–£250 per month
- 12.5 mg and 15 mg doses: approximately £250–£300+ per month
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
Factors Affecting Mounjaro Price and Access
Regional NHS availability is a key factor — some integrated care boards (ICBs) have well-established weight management programmes with faster access, whilst others have waiting lists exceeding two years. Private costs also vary between pharmacies and depending on whether you choose to pay per dose or purchase a full course upfront. Using our free GLP-1 weight loss calculator can help you understand potential outcomes at different doses, allowing you to weigh costs against expected results. Your GP or a licensed prescriber will assess your eligibility and help you explore both NHS and private routes based on your individual circumstances and BMI using our free BMI calculator.
- 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 is approved for use through NHS tier 3 specialist weight management services following NICE guidance. However, availability varies significantly by region — some areas have well-established services, whilst others have lengthy waiting lists or limited access. You'll need a GP referral to access NHS weight management services. Private access is available without waiting through online prescribing without NHS referral.
What's the difference between Mounjaro price on NHS versus private?
On the NHS, you pay only the standard prescription charge (£9.90 in England, free if eligible) once prescribed. Privately, costs range from £150–£300+ per month depending on dose, plus a prescriber consultation fee. The initial titration period (reaching your maintenance dose) costs more overall than ongoing maintenance doses because you cycle through multiple dose strengths.
Can I switch from private Mounjaro to NHS?
Potentially, yes. If you're using Mounjaro privately and wish to transition to NHS care, you'd need to be referred to your local tier 3 weight management service by your GP. However, NHS prescribing decisions are made by the specialist service, and availability depends on your region. Discuss this with your GP or current prescriber.
Why does Mounjaro cost more than Wegovy in the UK?
Mounjaro is a dual GIP/GLP-1 receptor agonist (more complex mechanism), whilst Wegovy is a single GLP-1 agonist. Mounjaro's mechanism requires more extensive development and manufacturing. Both are prescription-only. Private prices for both vary by provider and dose — direct comparison shopping between pharmacies is recommended.
Are there any patient assistance or discount schemes for Mounjaro in the UK?
Eli Lilly (the manufacturer) occasionally offers support programmes, though these are not widely publicised. Some private online pharmacies offer loyalty schemes or bulk purchase discounts. Check with your prescriber or pharmacy directly about any available schemes. NHS access eliminates cost concerns entirely once approved by your regional service.
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.