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 12.5mg Price in the UK
Mounjaro 12.5mg is the second-highest dose of tirzepatide available in the UK for weight management. The cost of Mounjaro varies significantly depending on whether you access it through the NHS or privately. If you're considering this prescription weight loss injection, understanding the pricing structure and how to access it is essential for your decision-making. This guide explains UK pricing, how the dose system works, and your options for obtaining Mounjaro.
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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 12.5mg Pricing in the UK
Private pricing for Mounjaro 12.5mg in the UK typically ranges from £200 to £320 per month, depending on the provider and whether you're paying per dose or per month subscription. Each KwikPen device contains 4 weekly doses, making the per-injection cost approximately £50–£80 when purchasing privately through a GPhC-registered online pharmacy following clinical assessment.
NHS access to Mounjaro is available but limited. It's dispensed free through specialist tier 3/4 weight management services in your local integrated care board (ICB), though waiting lists can be substantial — sometimes months or years in some regions. NICE has approved tirzepatide for NHS use, but availability depends on your area and whether you meet strict eligibility criteria.
- 12.5mg is the penultimate dose before the maximum 15mg
- Monthly costs are similar across all active doses (5mg–15mg)
- Private providers may offer payment plans
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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.
Understanding Mounjaro Dosing & Access Routes
Mounjaro works through dose titration — you start at 2.5mg and increase every 4 weeks until reaching your effective dose. By the time you reach 12.5mg, you've been on treatment for approximately 20+ weeks. This gradual approach helps minimise side effects and allows your body to adapt.
To access Mounjaro privately in the UK, you'll need an online consultation with a UK-licensed prescriber who will assess your eligibility based on BMI (usually 30+ or 27+ with weight-related health conditions) and medical history. If eligible, they issue a prescription to a GPhC-registered pharmacy. Our GLP-1 weight loss calculator can help you understand potential outcomes at different doses, while your BMI calculator confirms your current category for eligibility assessment.
- 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 12.5mg more expensive than lower doses?
No. All active doses of Mounjaro (5mg–15mg) cost roughly the same when obtained privately — around £200–£320 per month. The price is based on the KwikPen device (4 doses), not the specific dose strength. You pay the same whether using 5mg, 10mg, 12.5mg, or 15mg.
Can I get Mounjaro 12.5mg on the NHS?
Yes, but availability is limited. NICE has approved tirzepatide for NHS weight management services, but access depends on your local integrated care board and referral to specialist tier 3/4 services. Waiting lists in some regions are very long. Ask your GP about NHS eligibility and local availability.
What's the difference between Mounjaro and Wegovy pricing?
Mounjaro and Wegovy (semaglutide) typically cost similarly in the UK — both around £200–£320 monthly privately. However, Mounjaro is a dual GIP/GLP-1 agonist while Wegovy is GLP-1 only. Exact pricing varies by provider and dose. Compare costs across multiple pharmacies.
Why does Mounjaro 12.5mg cost more than buying it abroad?
Mounjaro purchased through unauthorised suppliers abroad may be counterfeit, stolen, or stored incorrectly. UK-licensed pharmacies assures authenticity, proper storage (refrigeration), and accountability. The higher cost reflects regulatory compliance, clinical oversight, and safety assurance. Always use GPhC-registered pharmacies.
Do I need to pay the full price if I'm overweight but healthy?
Eligibility depends on BMI and health factors. You need a BMI of 30+ or 27–29.9+ with weight-related conditions (prediabetes, high blood pressure, sleep apnoea, etc.). A prescriber assesses this during clinical consultation. Use our BMI calculator to check your category before consultation.
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.