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 Prices in September — UK NHS and Private Routes
Mounjaro (tirzepatide) prices vary significantly depending on whether you access it through the NHS or privately in the UK. If you're considering this prescription-only weight management injection, understanding the cost pathways and eligibility criteria is essential. This guide explains current UK pricing, NHS access through specialist services, and what you can expect to pay for private treatment this September, plus how your BMI and health circumstances affect your options.
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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.
NHS Access and Eligibility for Mounjaro in the UK
Mounjaro is available through the NHS for adults meeting specific criteria: a BMI of 30 kg/m² or above, or 25–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or sleep apnoea. However, NHS access is through specialist tier 3 weight management services, not standard GP prescription.
If eligible, you won't pay directly — treatment is provided through your local Integrated Care Board (ICB). However, access varies significantly by region and waiting lists can extend months or longer. Your GP refers you to specialist services; they then assess whether tirzepatide is appropriate. The dual GIP/GLP-1 mechanism of Mounjaro may help regulate appetite and support weight loss alongside a reduced-calorie diet and increased physical activity. Check with your GP about availability in your area and current waiting times for tier 3 referral.
Use our free GLP-1 weight loss calculator to estimate potential outcomes at different Mounjaro doses, and the BMI calculator to confirm your eligibility threshold.
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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.
Private Mounjaro Pricing in September 2024
Private Mounjaro costs typically range from £129–£320 per month, depending on dose and provider. Starter doses (2.5 mg) are usually at the lower end; maintenance doses (10–15 mg) cost more. Each KwikPen contains 4 weeks' supply (4 once-weekly injections).
Private access is through GPhC-registered online prescribing services following a remote clinical assessment. This route does not require NHS referral or waiting lists—assessment and prescription can be arranged within days. Pricing varies between providers, so compare costs for your required dose before committing. Prescribers assess your BMI, health history, and medication interactions to ensure safety. Private treatment requires self-funding but offers faster access than NHS pathways, making it an option for those unable to wait for specialist services or outside current NHS thresholds.
- 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 September 2024?
Mounjaro is free through the NHS if prescribed by a specialist tier 3 weight management service and you meet eligibility criteria (BMI ≥30, or 25–29.9 with weight-related conditions). However, access varies significantly by region and waiting lists are often lengthy. Ask your GP about availability in your area.
Why is there a price difference between NHS and private Mounjaro?
The NHS covers medication costs for eligible patients through specialist services, so there's no direct charge. Private providers set their own pricing based on operational costs, clinical assessment, and prescription management. Private access is faster but requires self-funding.
What does a month's supply of Mounjaro cost privately?
Private Mounjaro typically costs £129–£320 per month depending on dose (starter 2.5 mg is cheaper; maximum 15 mg is pricier). Each KwikPen has 4 weekly injections. Prices vary by provider, so compare before purchasing.
How do I get Mounjaro prescribed in September—NHS or private?
NHS: Ask your GP for referral to tier 3 specialist weight management services (free but potentially long wait). Private: Use an online clinical assessment with a GPhC-registered prescriber (faster, self-funded). Both routes require prescription following clinical evaluation of BMI and health.
Will my Mounjaro price change based on which dose I'm on?
Yes. Doses escalate from 2.5 mg (starting) to 15 mg (maximum), and private pricing typically increases with dose. Your prescriber will titrate gradually—you start low and increase every 4 weeks based on tolerance and response, so your monthly cost may rise over time.
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.