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) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. Private costs typically range from £129 to £320+ per month depending on the dose, while NHS access is free at the point of use but involves waiting times and regional availability. Understanding the different pricing structures and access routes can help you make an informed decision about whether this prescription weight loss injection is right for you.
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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.
Private Mounjaro Pricing and What Affects Cost
Private prescription costs for Mounjaro in the UK typically range from approximately £129 to £320 per month, depending on the dose you're prescribed. Higher doses (10–15 mg) cost more than starting doses (2.5–5 mg). Each KwikPen contains four weekly doses, so monthly costs reflect a full month's supply.
- Starting dose (2.5 mg): approximately £129–£160/month
- Maintenance doses (5–10 mg): approximately £180–£250/month
- Maximum dose (15 mg): approximately £280–£320/month
Several factors influence the final price you pay privately: the specific online prescribing service or clinic you use, your current dose (prescribers adjust this over 20+ weeks of titration), and whether the provider offers package deals for multiple pens. Always compare prices across GPhC-registered pharmacies before committing, as costs can vary significantly. Remember that private prescribing requires a clinical assessment to confirm you meet eligibility criteria.
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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
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS Access and Regional Availability
NHS access to Mounjaro is free at the point of use once prescribed, but availability depends on your region and local Integrated Care Board (ICB) funding decisions. NICE approved tirzepatide (Mounjaro) for use in NHS specialist weight management services in 2024, but not all areas have implemented it yet.
- NHS access is typically through tier 3 specialist weight management services, not standard GP prescription
- Your GP can refer you to your local specialist service, but waiting times vary from several months to over a year in many areas
- Regional variation is significant — some ICBs fund it readily, others have restrictions or long waiting lists
- Once prescribed on the NHS, ongoing supply is free
Contact your GP to ask whether your local NHS weight management service offers tirzepatide and what the current waiting time is. Use our free GLP-1 weight loss calculator to explore potential outcomes while you wait, and track your progress with our free progress tracker once treatment begins.
When considering Mounjaro costs, compare it to other available weight loss injections in the UK. Wegovy (semaglutide) typically costs £150–£300/month privately depending on dose, with similar NHS availability to Mounjaro. Saxenda (liraglutide) is a daily injection costing £120–£200/month but requires more frequent injections. Mounjaro's dual GIP/GLP-1 mechanism differs from single GLP-1 medications like Wegovy, and clinical trials showed it may support slightly higher average weight loss, though results vary significantly between individuals.
Beyond injections, your GP can discuss non-medication support through NHS tier 1 and 2 services, which are free but may require more self-discipline. Use our free BMI calculator to understand your current health status and eligibility, and consider discussing all available options with your GP or a licensed prescriber to find what suits your circumstances, budget, and health goals.
- 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, NICE approved tirzepatide (Mounjaro) for NHS use in 2024, but access is through specialist tier 3 weight management services, not routine GP prescription. Availability and waiting times vary significantly by region. Contact your local ICB or ask your GP about your area's current access and waiting list.
Why does Mounjaro cost more at higher doses?
The cost reflects the active ingredient concentration in each KwikPen dose. A 15 mg Mounjaro kwikpen contains more tirzepatide than a 2.5 mg pen, so suppliers charge proportionally more. As you titrate up from starting dose to maintenance dose, your monthly costs will increase.
Can I switch between NHS and private Mounjaro?
Yes, though you should inform your prescriber and pharmacist. If you start privately and later access NHS prescription, or vice versa, your prescriber will continue at your current dose. Any switch should be managed carefully to avoid gaps in supply or dose interruptions.
Is Mounjaro cheaper than Wegovy in the UK?
Prices are roughly similar — both typically cost £150–£300/month privately depending on dose. Wegovy may be slightly cheaper at starting doses, but at maximum doses costs are comparable. Your final cost depends on your specific dose, the provider, and any package deals offered.
What happens if I can't afford private Mounjaro?
Explore NHS access through your GP referral to specialist services — it's free once prescribed. Also discuss with your GP other tier 1–2 weight management support available locally. Some areas offer free digital programmes or community weight management services that may suit your situation.
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.