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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What Is The Cost Of Mounjaro In The UK?
The cost of Mounjaro in the UK depends on how you access it. Through the NHS, Mounjaro is available free at the point of care if you're eligible for specialist weight management services — though access varies significantly by region. Via private prescription, Mounjaro costs typically range from £180 to £320 per month depending on your dose and the prescribing service. Understanding both routes helps you make an informed decision about this prescription weight management 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.
NHS Access To Mounjaro — Cost, Eligibility & Availability
NHS Mounjaro is free if prescribed through specialist tier 3 or tier 4 weight management services, but availability varies greatly across the UK. NICE has approved tirzepatide (Mounjaro's active ingredient) for use within NHS weight management services for adults with a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions like type 2 diabetes, hypertension, or sleep apnoea.
To access NHS Mounjaro, you must be referred by your GP to your local integrated care board's (ICB) specialist weight management service. Many areas have significant waiting lists — in some regions, delays can be several months to over a year. Your GP can tell you about waiting times in your area and whether your region currently offers tirzepatide prescribing. Once approved, the NHS KwikPen device and all dose titrations are provided free throughout your treatment.
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.
Private Mounjaro Prescribing In The UK — Costs & Access
If you cannot access Mounjaro through the NHS or prefer not to wait, private online prescribing is available through GPhC-registered UK pharmacies. Private Mounjaro costs typically range from £180 to £320 per month depending on your starting dose and the prescribing service. A 2.5 mg starter pack (four weekly injections) costs around £180–£220, while the maximum 15 mg dose costs approximately £280–£320 monthly. You'll also need to pay for an online clinical assessment (typically £20–£50), though many private services include this with your first prescription. Private access means no waiting list, but you must meet clinical eligibility criteria assessed by a UK-licensed prescriber.
Mounjaro vs Wegovy cost comparison: While Mounjaro may have a higher upfront monthly cost than some alternatives, both medications require ongoing prescription costs through private services. Use our GLP-1 weight loss calculator to compare projected weight loss outcomes across different doses, which may help you evaluate whether either medication aligns with your health goals. Your GP can also discuss whether your specific health situation might affect NHS eligibility or private prescribing suitability.
- 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 free on the NHS in the UK?
Yes, Mounjaro is free through NHS specialist weight management services if you're eligible. However, NHS availability varies significantly by region, and you'll typically need a GP referral to tier 3 services. Waiting times can be several months in some areas. Contact your GP to check availability and waiting lists in your local integrated care board.
How much does private Mounjaro cost per month in the UK?
Private Mounjaro costs typically range from £180 to £320 per month depending on your dose. A starter 2.5 mg pack costs around £180–£220, while the maximum 15 mg dose costs approximately £280–£320 monthly. You'll also pay a one-time online clinical assessment fee (£20–£50), though many services include this with your first prescription.
What are the NHS eligibility criteria for Mounjaro on prescription?
You may be eligible for NHS Mounjaro if you have a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions such as type 2 diabetes, hypertension, sleep apnoea, or cardiovascular disease. For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds may apply. Your GP assesses eligibility.
What's the difference in cost between NHS and private Mounjaro in the UK?
NHS Mounjaro is completely free once prescribed, but availability is limited and waiting lists can be long. Private Mounjaro costs £180–£320 monthly but offers immediate access without waiting. Private prescribing requires an online clinical assessment. Choose based on your timeline and local NHS availability.
Does the Mounjaro KwikPen cost extra on the NHS?
No. When prescribed through the NHS, the KwikPen device and all your injections are provided free. When prescribing privately, the cost of the KwikPen is included in your monthly fee — there are no additional device costs beyond the prescription price quoted.
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.