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 Price Increases in the UK — What You Need to Know
Eli Lilly has raised the price of Mounjaro (tirzepatide) in the UK, affecting both NHS and private prescription costs. Understanding current pricing, how to access this weight loss injection through NHS specialist services or private prescribing, and what dose escalation costs can help you plan your weight management options. This guide explains UK pricing, access routes, and what to expect financially when considering Mounjaro treatment alongside lifestyle changes.
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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.
Mounjaro Pricing in the UK — NHS and Private Costs
Mounjaro pricing in the UK varies significantly depending on whether you access it through the NHS or privately. NHS access is generally free at point of care, but is limited to specialist tier 3 weight management services—referral from your GP is required, and regional availability varies considerably. Some ICBs (Integrated Care Boards) have restricted access or extended waiting lists.
Private prescription costs for Mounjaro typically range from £150 to £280 per month depending on dose and provider, though prices have increased following Eli Lilly's recent adjustments. Each Mounjaro KwikPen device contains four weekly injections, so monthly costs reflect the dose you're prescribed. Starting doses (2.5 mg) are usually less expensive, while maintenance doses (10 mg to 15 mg) cost more. When calculating total cost, remember that dose titration happens over several weeks—you'll start at 2.5 mg and increase gradually, so your initial monthly outlay may be lower. Private prescriptions require an online clinical assessment from a UK-licensed prescriber, and you'll need to budget for ongoing medication costs if you choose this route.
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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.
Accessing Mounjaro — NHS vs Private Routes and What to Expect
NHS route: Ask your GP for referral to a specialist weight management service (tier 3 or 4). Assessment can take weeks to months depending on your area. NICE has approved tirzepatide for NHS use, but availability depends on your local ICB commissioning.
Private route: Book an online consultation with a UK-registered prescriber, complete a health questionnaire, and receive a prescription if eligible. A licensed pharmacy dispenses your medication. This route is faster but requires private payment. Whichever route you choose, use our free GLP-1 weight loss calculator to estimate potential results at different doses, and track your progress with our progress tracker once treatment begins.
- 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.
What's the current price of Mounjaro per month in the UK privately?
Private Mounjaro costs typically range from £150–£280 per month depending on dose and provider. Prices have increased following Eli Lilly's recent adjustments. Starting doses (2.5 mg) cost less than maximum doses (15 mg). Always check current pricing with your chosen provider, as costs may vary.
Can I access Mounjaro free on the NHS?
Yes, if prescribed through an NHS specialist weight management service after referral from your GP. However, access is limited and varies by region. Some areas have long waiting lists or restricted commissioning. Contact your GP to enquire about NHS tier 3 weight management services in your area.
How long does dose titration take and does it affect my monthly cost?
Dose titration takes approximately 16 weeks to reach the maximum dose of 15 mg. You start at 2.5 mg and increase every 4 weeks. Your monthly cost will increase as your dose increases, so budget higher amounts as treatment progresses.
What's the difference between Mounjaro and Wegovy pricing?
Both are weight loss injections, but Mounjaro (tirzepatide) uses a dual GIP/GLP-1 mechanism while Wegovy (semaglutide) is GLP-1 only. Pricing is similar in the UK private market (£150–£280/month), though actual costs depend on dose and provider. Compare options with your prescriber.
Do I need to pay for ongoing treatment or can I stop at any time?
Mounjaro is an ongoing prescription medication—you'll need to continue monthly injections as long as you wish to receive treatment. There's no long-term contract, but stopping suddenly may result in weight regain. Discuss your treatment plan with your prescriber.
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.