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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How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) prices in the UK vary significantly depending on whether you access it through the NHS or privately. On the NHS, tirzepatide is available through specialist weight management services in some areas, though access is limited and varies by region. Privately, Mounjaro costs typically range from £129 to £320 per month depending on your dose and the prescribing provider. Understanding the pricing structure and your eligibility options can help you make an informed decision about this prescription weight loss injection.
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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 in the UK
Private prescription costs for Mounjaro typically start at around £129–£180 per month for starter doses (2.5 mg to 5 mg) and increase to approximately £220–£320 per month for higher maintenance doses (10 mg to 15 mg). Prices vary between prescribing providers and may differ based on where you purchase your KwikPen device.
- Starter doses (2.5–5 mg): approximately £129–£180/month
- Mid-range doses (7.5–10 mg): approximately £180–£250/month
- Maximum dose (15 mg): approximately £280–£320/month
Private prescribing typically requires an online clinical assessment (usually £20–£50) before your prescription is issued. You'll also need to factor in the cost of repeat assessments every 3–6 months, depending on your provider's requirements. Always check the full cost breakdown before committing to private tirzepatide treatment.
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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 Cost Considerations
On the NHS, Mounjaro is available through specialist tier 3 and tier 4 weight management services, and there is no prescription cost if you're eligible — you'll only pay standard NHS prescription charges (currently £9.90 per item in England, or nothing if you qualify for free prescriptions). However, NHS access is extremely limited and varies significantly by region.
Your GP can refer you to your local specialist weight management service, but waiting lists can be very long in many areas, sometimes spanning months to years. Check with your local Integrated Care Board (ICB) to understand availability in your region. Use our free BMI calculator to check whether you may meet NHS eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions).
- 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 there a generic version of Mounjaro available in the UK to reduce cost?
No generic tirzepatide is currently available in the UK — Mounjaro remains brand-name only. Patents protect the formulation until 2032 at the earliest. This means private prices are unlikely to drop significantly in the near term. Always use licensed prescribers and GPhC-registered pharmacies to ensure you receive genuine medication.
Why do Mounjaro prices vary so much between different private providers?
Prices vary due to different supplier costs, pharmacy margins, clinical assessment fees, and follow-up consultation models. Some providers bundle assessments into the price; others charge separately. Compare total costs across providers before choosing, including any required repeat assessments or consultations.
Can I get a lower price for Mounjaro if I buy a multiple-month supply upfront?
Some private providers offer modest discounts for bulk orders (3 or 6 months), though savings are typically small. Always confirm that the medication will remain suitable for you before committing to large upfront purchases. Your dose may change during titration, affecting your needs.
How does the cost of Mounjaro compare to Wegovy in the UK?
Mounjaro and Wegovy (semaglutide) often cost similarly in private practice — typically £129–£320/month depending on dose. Mounjaro is a dual GIP and GLP-1 agonist (potentially stronger appetite suppression), while Wegovy is GLP-1 only. Cost alone shouldn't drive your choice — a prescriber should recommend based on your clinical profile. Use our GLP-1 weight loss calculator to compare projected outcomes.
Should I wait for NHS access instead of paying privately for Mounjaro?
This depends on your circumstances. NHS access offers cost savings but involves lengthy waits and regional variation. If you have weight-related health conditions or high BMI, NHS referral is worth requesting. Private access lets you start sooner but involves out-of-pocket costs. Discuss both pathways with your GP to understand your local availability and waiting times.
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.