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 Bundles UK Price — What You Need to Know
Mounjaro (tirzepatide) bundles in the UK typically cost between £129 and £320 per month, depending on the dose and provider. A "bundle" usually refers to a four-week supply of weekly injections in a single KwikPen device. Prices vary significantly between NHS specialist services (where eligible patients may access it free or at standard prescription cost) and private online prescribing services. This guide explains the current pricing landscape, what affects cost, and how to access tirzepatide in the UK.
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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.
Understanding Mounjaro Pricing in the UK
Mounjaro bundles are sold as a four-week supply — one pre-filled KwikPen device containing four weekly doses. Private pricing typically ranges from £129 to £320 per month depending on the dose strength. The exact price depends on which provider you use and the dose prescribed.
- Lower doses (2.5 mg to 5 mg) — typically £129–£180 per bundle
- Mid-range doses (7.5 mg to 10 mg) — typically £180–£240 per bundle
- Higher doses (12.5 mg to 15 mg) — typically £240–£320 per bundle
NHS access is available through specialist tier 3 weight management services for eligible patients, where prescriptions are dispensed at standard NHS prescription rates (approximately £9.90 if you pay, or free if exempt). However, NHS availability varies significantly by region and involves specialist referral and assessment. Many people choose private prescribing to access treatment without waiting for NHS specialist services.
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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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Everything you need to understand your weight, explore medication options, and track your progress — completely free.
How to Access Mounjaro in the UK
Private access: Most people access Mounjaro privately through GPhC-registered online prescribing services. You complete an online consultation with a UK-licensed prescriber, who assesses whether the medication is appropriate for you based on your health history and BMI. If approved, a prescription is issued and dispensed by a registered pharmacy. This route bypasses NHS waiting lists but requires payment at private rates.
NHS access: Ask your GP for a referral to a tier 3 specialist weight management service in your area. These services can prescribe Mounjaro, but access depends on local commissioning and your BMI or weight-related health conditions. Use our free BMI calculator to check your starting point, then discuss with your GP.
Before accessing tirzepatide, you'll need a clinical assessment to confirm eligibility. Your prescriber will check your BMI, medical history, current medications, and whether you have weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. Once approved and on treatment, you'll track your progress with regular follow-ups. Try our GLP-1 weight loss calculator to see potential outcomes at different doses, and use our progress tracker to monitor your weight loss journey.
- 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's included in a Mounjaro bundle?
A Mounjaro bundle is one pre-filled KwikPen device containing four weekly injections (one month's supply). Each pen contains a single tirzepatide dose strength, such as 2.5 mg, 5 mg, 10 mg, or 15 mg per injection. You inject once per week for four weeks, then order the next month's bundle.
Why does Mounjaro cost more at higher doses?
The active ingredient (tirzepatide) is more concentrated in higher-dose pens, so manufacturing and supply costs are higher. Additionally, patients on higher doses have typically progressed through the titration schedule and may represent lower clinical risk, affecting pricing strategies.
Can I get Mounjaro on the NHS for free?
Yes, if you're eligible for NHS specialist weight management services and referred through your GP. However, NHS availability is limited and varies by region. Many areas have long waiting lists. Private prescribing offers faster access but at higher cost.
Is tirzepatide (Mounjaro) the same as semaglutide (Wegovy)?
No. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, while Wegovy (semaglutide) is a GLP-1-only agonist. Mounjaro typically shows higher average weight loss in clinical trials, but both are prescription-only weight management injections licensed in the UK.
What affects the final price I pay for Mounjaro?
Your dose, your prescriber, and your provider all affect price. Private online services typically charge £129–£320 per month depending on dose. Some providers offer loyalty discounts or bundle deals for multi-month orders. NHS prescription costs are fixed at £9.90 (or free if exempt).
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.