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 Do Mounjaro Injections Cost in the UK?
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through NHS specialist services or private prescribing. The cost varies significantly depending on whether you access it through the NHS or privately. Understanding the pricing structure, eligibility criteria, and what's included in the cost can help you make an informed decision about this weight loss treatment option.
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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 Pricing: NHS vs Private Access
NHS access: Mounjaro is approved by NICE for use within NHS tier 3 specialist weight management services. If you qualify, there is no cost to you — the NHS covers the full expense. However, access through the NHS typically requires a referral from your GP to a specialist service, and availability varies significantly by region (Integrated Care Board). Many areas have lengthy waiting lists, sometimes months or years.
Private prescription cost: Through UK-registered online prescribers and GPhC-regulated pharmacies, a typical Mounjaro pen costs between £129 and £320 per month, depending on the dose being prescribed and the pharmacy provider. Each KwikPen contains four weekly doses, so costs are usually quoted per month or per four-week supply. Prices may vary between different private prescribers.
What's included: The cost covers the medication itself, the KwikPen device, and clinical oversight from a UK-licensed prescriber. You do not need NHS referral to access private prescribing — only a clinical assessment to confirm suitability.
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.
Mounjaro Dose Titration and Total Treatment Cost
Mounjaro dosing starts at 2.5 mg per week and increases gradually over at least 16 weeks to reach the maximum 15 mg dose. Most people find their optimal dose between 5 mg and 10 mg, meaning they may not reach the highest dose or the highest associated cost. Starting on a lower dose also means your initial monthly cost is lower. When calculating total treatment cost, remember that you'll spend time at each dose level before escalating.
Using our GLP-1 weight loss calculator can help you estimate potential weight loss at different doses, which may help inform your cost-benefit decision. Your prescriber will monitor your progress and adjust your dose based on your individual response and tolerance.
- 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.
Can I get Mounjaro free through the NHS in the UK?
Yes, if you meet NHS eligibility criteria and are referred to a tier 3 specialist weight management service. However, availability varies significantly by region and waiting lists can be long. Your GP can discuss referral options with you, though not all areas currently offer tirzepatide through the NHS.
How much does a Mounjaro KwikPen cost privately in the UK?
A typical KwikPen (four weekly doses) costs between £129 and £320 per month privately, depending on the dose and pharmacy provider. Prices vary between different UK-regulated prescribers. Higher doses (10–15 mg) are more expensive than lower starting doses (2.5–5 mg).
Is Mounjaro more expensive than Wegovy in the UK?
Prices are broadly similar between private prescribers, though exact costs vary by provider and dose. Mounjaro uses a higher milligram dose range (up to 15 mg) compared to Wegovy's 2.4 mg maximum, but this doesn't necessarily translate to proportionally higher costs — it reflects different mechanisms of action.
What does the private Mounjaro cost include?
The cost typically includes the tirzepatide injection, the KwikPen device, and clinical assessment by a UK-licensed prescriber. It does not include GP follow-up, blood tests, or other healthcare services — you may need to arrange these separately with your GP if monitoring is needed.
Will I need to pay for Mounjaro indefinitely?
Mounjaro is typically an ongoing treatment. If you stop the injections, weight regain can occur, which is why long-term use is often recommended. Cost depends on your dose and whether you access it through NHS or privately. Discuss sustainability with your prescriber before starting.
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.