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 Lowest Price for Mounjaro in the UK?
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or private prescription routes. If you're considering this prescription weight management injection, it's important to understand the true costs involved — including the clinical assessment required before treatment begins. This guide explains UK Mounjaro pricing transparently, so you can make an informed decision about whether this medication is right for your situation and budget.
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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.
How Much Does Mounjaro Cost in the UK?
NHS access: Mounjaro may be available free through NHS specialist weight management services (tier 3 or 4) if you meet eligibility criteria and are referred by your GP. However, NHS availability varies significantly by region, and waiting lists can extend months or years in many areas.
Private access: Through private online prescribing, Mounjaro typically costs between £129 and £320 per month, depending on your dose. Each KwikPen contains four weekly doses (one month's supply). Starting doses (2.5 mg) are generally at the lower end of this range, while higher maintenance doses (10 mg to 15 mg) cost more. Some providers offer monthly subscriptions; others allow one-off purchases. Private prescriptions require a clinical assessment (usually £20–£50) before your first order.
Important: Price comparisons between providers are worth doing — costs and consultation fees vary. Always verify that any provider is GPhC-registered and operates legally in the UK.
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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.
Understanding Mounjaro Dosing and Cost Per Dose
Mounjaro treatment begins at 2.5 mg weekly for 4 weeks, then escalates gradually (5 mg, 7.5 mg, 10 mg, 12.5 mg, 15 mg) depending on your response and tolerability. Each dose increase takes a minimum of 4 weeks. The lowest-price option is usually the starting dose, but many people eventually move to higher doses for better results — which increases monthly cost. Calculate your potential cost by identifying which dose you'd likely reach based on clinical guidance. Our free GLP-1 weight loss calculator can help you understand typical dose progression and projected outcomes at different dose levels, which helps inform the financial commitment involved.
- 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 available on the NHS for free in the UK?
Mounjaro may be available through NHS specialist weight management services if you meet eligibility criteria (BMI ≥30, or ≥27.5 with weight-related health conditions) and are referred by your GP. However, NHS availability varies by region and waiting lists are often very long. Private access is usually faster but costs £129–£320 per month depending on dose.
What's included in the price of a Mounjaro KwikPen?
Each KwikPen contains 4 pre-filled doses (one month's supply of once-weekly injections). The price you see typically covers the pen itself plus the medication. A clinical assessment and consultation fees (£20–£50) are usually separate and required before your first order. Check whether follow-up prescriptions require additional consultation fees.
Do higher doses of Mounjaro cost significantly more?
Yes. Starting doses (2.5–5 mg) are typically cheaper than maintenance doses (10–15 mg). If your prescriber escalates your dose over several months, your monthly cost will increase accordingly. It's worth asking providers for tiered pricing before starting treatment, so you understand the full cost trajectory.
How does Mounjaro pricing compare to Wegovy in the UK?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) cost roughly £129–£320 monthly through private prescribing, depending on dose. Mounjaro is a dual GIP+GLP-1 agonist; Wegovy is a GLP-1 agonist only. Clinical trial data suggests Mounjaro may produce slightly greater average weight loss, but individual results vary. Price should not be the only factor — eligibility, side effect profile, and your prescriber's recommendation matter more.
Can I switch between NHS and private Mounjaro if I want?
Yes. If you start privately but later gain NHS access (through a tier 3 specialist service), you can switch to NHS prescribing without penalty. Conversely, if you're on an NHS waiting list, you can start privately while you wait. Inform both your GP and private prescriber to ensure coordinated care and avoid duplicate treatment.
Ready to take control of your weight loss journey?
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