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 Does Mounjaro Cost Per Month in the UK?
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection licensed in the UK. The cost varies significantly depending on whether you access it through the NHS or privately. NHS access through specialist weight management services is free at the point of care, but availability is limited and waiting lists can be lengthy. Private prescriptions typically cost between £129 and £320 per month depending on your dose, with costs increasing as you progress to higher doses during your treatment journey.
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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 vs Private Mounjaro Costs in the UK
NHS access: Mounjaro is available free through NHS specialist tier 3 weight management services, but access varies significantly by region and ICB (Integrated Care Board). You'll need a referral from your GP to a specialist service — waiting times can range from several months to over a year in many areas. Not all regions currently offer Mounjaro on the NHS, and availability depends on your local service's commissioning decisions.
Private access: Through a GPhC-registered online pharmacy following a clinical assessment with a UK-licensed prescriber, costs typically range from £129–£320 per month. Most private providers charge based on your current dose: starting doses (2.5–5 mg) cost less than maintenance doses (10–15 mg). Each KwikPen contains four weekly doses, so monthly cost reflects your current treatment dose. Many providers offer subscription discounts if you commit to ongoing treatment.
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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.
Understanding Mounjaro Dosing and Price Tiers
Mounjaro dosing starts at 2.5 mg weekly and typically escalates every 4 weeks: 2.5 mg → 5 mg → 7.5 mg → 10 mg → 12.5 mg → 15 mg maximum. Your monthly cost increases as you escalate doses. Lower starting doses (2.5–5 mg) usually cost £129–£180 per month privately, while higher maintenance doses (10–15 mg) can reach £250–£320 per month. The GIP receptor agonist component of tirzepatide may contribute to greater weight loss compared to GLP-1 only medications, but individual results vary significantly. Use our GLP-1 weight loss calculator to estimate potential outcomes at different doses, and our BMI calculator to track your baseline and progress.
- 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.
How much does Mounjaro cost on the NHS in the UK?
Mounjaro is free on the NHS through specialist weight management services, but availability is limited and varies by region. You'll need a GP referral and may face waiting lists of several months to over a year. Not all areas currently commission Mounjaro on the NHS, so check with your local ICB.
What's the typical private cost for Mounjaro per month?
Private Mounjaro typically costs £129–£320 per month depending on your dose. Starting doses cost less; higher maintenance doses (10–15 mg) cost more. Many online pharmacies offer subscription packages with potential discounts for longer-term treatment commitments.
Does the cost change as I increase my Mounjaro dose?
Yes, costs increase with each dose escalation. Starting doses (2.5–5 mg) are cheaper than maintenance doses (10–15 mg). Your prescriber will escalate your dose gradually, so expect your monthly cost to increase over the first 20 weeks of treatment.
Can I get Mounjaro privately without waiting for NHS services?
Yes, private tirzepatide is available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. You don't need an NHS referral, but you do need a valid prescription from a qualified healthcare professional assessing your eligibility.
Is Mounjaro cost worth it compared to other weight loss options?
Clinical trials showed Mounjaro helped participants lose an average of 15–21% of body weight over 72 weeks, though results vary. Compared to GLP-1 only medications like Wegovy, tirzepatide's dual GIP/GLP-1 mechanism may offer advantages, but cost-benefit depends on your individual circumstances and response. Discuss with your prescriber or GP.
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.