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 Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private online prescribing, but costs and access routes differ significantly. If you're considering this prescription weight loss injection, understanding the pricing structure and eligibility requirements is essential. This guide explains what Mounjaro costs, how to access it, and what to expect from each route. Use our GLP-1 weight loss calculator to explore potential outcomes at different doses, and check your BMI with our free calculator to assess eligibility.
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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.
Mounjaro Pricing in the UK — Private Route
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month depending on your dose and the prescribing provider. Starting doses (2.5 mg) are usually at the lower end, while maximum doses (15 mg) cost more. Each KwikPen contains four weekly injections, so monthly supply equates to a one-month treatment course.
Costs vary between providers because private clinics and online pharmacies set their own pricing. Some providers offer:
- Dose-based pricing (lower dose = lower cost)
- Subscription models with discounts for longer commitments
- Initial consultation fees (typically £20–£50, sometimes waived if you proceed with treatment)
- Free prescription if clinically approved
Private access requires an online clinical assessment with a UK-licensed prescriber, which is usually quick and straightforward. Once approved, your prescription is dispensed by a GPhC-registered pharmacy. Payment is direct to the provider — private prescriptions are not covered by NHS.
Clinically BackedWeight Loss
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.
NHS Access to Mounjaro — Availability & Waiting Times
Mounjaro is approved by NICE for NHS use in specialist weight management services, but NHS access is limited and varies significantly by region. You cannot get Mounjaro through your GP directly — you must be referred to a tier 3 or tier 4 specialist weight management service.
NHS access involves:
- GP referral to your local Integrated Care Board (ICB) weight management service
- Assessment by a specialist team (dietitian, psychologist, doctor)
- Eligibility confirmation based on BMI, comorbidities, and previous weight loss attempts
- Potentially long waiting lists (3–24 months depending on region)
If approved on the NHS, Mounjaro is free at the point of use. However, availability depends entirely on your region and local funding priorities. Ask your GP whether your ICB currently commissions tirzepatide treatment.
- 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 in the UK?
Yes, Mounjaro is NICE-approved for NHS use in specialist tier 3/4 weight management services. However, availability varies significantly by region, and waiting lists can be very long. You need a GP referral to access NHS specialist services. Check with your GP whether your local Integrated Care Board (ICB) currently funds tirzepatide treatment.
What is the typical price of Mounjaro in the UK?
Private Mounjaro costs typically range from £129–£320 per month depending on dose. Starting doses (2.5 mg) are cheaper; maximum doses (15 mg) are most expensive. Each KwikPen contains four weekly injections. Online consultation fees may apply (£20–£50) but are sometimes waived if you proceed with treatment.
How do I get a private prescription for Mounjaro in the UK?
Complete an online clinical assessment with a UK-licensed prescriber through a private clinic or online pharmacy. You'll answer health questions and may have a brief video consultation. If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy. The entire process typically takes 24–48 hours.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar — both cost roughly £129–£320 per month privately depending on dose. Wegovy may be slightly cheaper at lower doses, but costs vary between providers. Neither is significantly cheaper than the other. Compare current pricing from different providers, as costs change regularly.
What is the difference between NHS and private access to Mounjaro?
NHS access is free at point of use but requires a GP referral, specialist assessment, and potentially long waiting lists. Private access costs £129–£320 monthly but offers faster access (24–48 hours) without NHS referral. Choose NHS if you can wait and prefer free treatment; choose private for quicker access and flexibility.
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.