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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Tirzepatide UK Price: What You Need to Know
Tirzepatide, sold as Mounjaro, is a prescription-only weight loss injection available in the UK at varying costs depending on where you access it. On the NHS, tirzepatide may be available through specialist weight management services, though access and waiting times vary significantly by region. Privately, tirzepatide costs typically range from £129 to £320 per month depending on your dose and provider. Understanding the pricing, eligibility criteria, and how to access this GLP-1 receptor agonist medication can help you make an informed decision about whether it's right for you.
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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.
How Much Does Tirzepatide Cost in the UK?
Private tirzepatide cost: Generally between £129–£320 per month, depending on your starting dose and the provider. Starting doses (2.5 mg) tend to be cheaper, while higher maintenance doses (10–15 mg) cost more. Each prescription typically covers 4 weeks of once-weekly injections. This cost usually includes the clinical assessment, prescription, and delivery.
NHS tirzepatide cost: Free on prescription if you meet eligibility criteria and are referred through a specialist tier 3 or tier 4 weight management service. However, NHS availability is limited by regional capacity and funding. Many areas have significant waiting lists, sometimes extending months or longer.
- Cost varies by dose (starting 2.5 mg is often cheaper than higher maintenance doses)
- Private providers include online prescribing services and some high street pharmacies
- NHS access requires specialist referral and assessment
- All tirzepatide in the UK is prescription-only — never available over the counter
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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.
Am I Eligible for Tirzepatide in the UK?
Eligibility for tirzepatide (Mounjaro) in the UK depends on your BMI and health status. You may qualify if you have a BMI of 30 or above, or a BMI of 27–29.9 with at least one weight-related health condition such as type 2 diabetes, high blood pressure, abnormal cholesterol, sleep apnoea, or cardiovascular disease.
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds may apply. Pregnancy, breastfeeding, and severe digestion problems are contraindications. Use our free BMI calculator to check your starting point, then speak with your GP or a licensed prescriber to assess whether tirzepatide is appropriate for you. Your prescriber will consider your full health picture, not just BMI.
- 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 tirzepatide available on the NHS in the UK?
Yes, tirzepatide (Mounjaro) is approved for NHS use through specialist weight management services (tier 3 or tier 4). However, availability is limited by regional funding and capacity. Many areas have long waiting lists. Your GP can refer you to your local specialist service, but access varies significantly depending on where you live.
How much does tirzepatide cost privately in the UK?
Private tirzepatide costs typically £129–£320 per month depending on your dose. Starting doses are cheaper; higher maintenance doses (10–15 mg) cost more. This usually includes clinical assessment, prescription, and delivery. Costs vary between providers, so it's worth comparing.
What's the difference between tirzepatide and semaglutide pricing?
Tirzepatide (Mounjaro) and semaglutide (Wegovy) are different medications with different pricing structures. Tirzepatide is a dual GIP/GLP-1 agonist; semaglutide is GLP-1 only. Pricing depends on the provider and dose, but both typically cost £129–£320/month privately. Ask your prescriber about which suits your circumstances and budget.
Do I need a private prescription for tirzepatide, or can my GP prescribe it?
GPs can prescribe tirzepatide, but NHS availability is through specialist weight management services, not routine GP practice. Privately, you can access tirzepatide through an online prescriber following a clinical assessment. The prescriber will issue a prescription to a UK-registered pharmacy.
Can I use my NHS prescription at a private pharmacy to save money?
If prescribed tirzepatide on the NHS, you would use it on the NHS. Private and NHS prescriptions are separate pathways. An NHS prescription is dispensed free; a private prescription costs what the pharmacy charges. Speak with your GP or prescriber about the most accessible option for you.
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.