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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Where to Get Mounjaro in the UK — Cost and Access Guide
Mounjaro (tirzepatide) is available in the UK through two main routes: NHS specialist weight management services and private online prescribing. The cost varies significantly depending on which route you choose, your dose, and your region. Understanding your options — including eligibility, waiting times, and pricing — helps you make an informed decision about accessing this prescription-only weight loss injection. This guide explains both routes, what to expect, and how costs compare.
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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.
Private Mounjaro Cost and How to Access It
Private prescription route: Mounjaro is available through GPhC-registered online pharmacies following a clinical assessment by a UK-licensed prescriber. Costs typically range from £129 to £320 per month depending on your dose and the provider.
- Starting dose (2.5 mg): Usually £129–£180/month
- Maintenance doses (5–10 mg): Usually £180–£240/month
- Higher doses (12.5–15 mg): Usually £240–£320/month
Each KwikPen contains 4 weekly doses (one month's supply). The online consultation fee is typically included in the overall cost or charged separately at £25–£50. Private access means no NHS referral is needed — you can start the process directly, though waiting times for initial consultation vary by provider. A prescriber will assess your eligibility during the online consultation based on your BMI, health conditions, and medical history.
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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.
NHS Access vs Private: Route Comparison
NHS route: Mounjaro is approved by NICE for use within NHS specialist tier 3 weight management services. Access is free on prescription, but you must be referred by your GP to a specialist service in your area. Availability and waiting times vary dramatically by region — some areas have waiting lists exceeding 12 months, whilst others have shorter waits. Not all ICBs (integrated care boards) currently offer Mounjaro through the NHS; some regions still only fund older medications like liraglutide (Saxenda).
Private route: Faster access (typically within days to weeks) without NHS referral. You pay the full cost upfront. Suitable if you want to start immediately or your NHS service has limited availability or long waiting lists. You can also use your free MyWeightCheck GLP-1 weight loss calculator to understand potential outcomes at different doses before committing.
NHS route: Mounjaro is approved by NICE for use within NHS specialist tier 3 weight management services. Access is free on prescription, but you must be referred by your GP to a specialist service in your area. Availability and waiting times vary dramatically by region — some areas have waiting lists exceeding 12 months, whilst others have shorter waits. Not all ICBs (integrated care boards) currently offer Mounjaro through the NHS; some regions still only fund older medications like liraglutide (Saxenda).
Private route: Faster access (typically within days to weeks) without NHS referral. You pay the full cost upfront. Suitable if you want to start immediately or your NHS service has limited availability or long waiting lists. You can also use your free MyWeightCheck GLP-1 weight loss calculator to understand potential outcomes at different doses before committing.
- 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. NICE approved tirzepatide (Mounjaro) for use within NHS specialist weight management services. Access is through tier 3 specialist services following a GP referral. However, availability varies significantly by region and some areas have very long waiting lists. Your GP can advise whether your local service currently prescribes Mounjaro.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129 to £320 per month depending on your dose. Starting doses (2.5 mg) are usually at the lower end; maintenance and higher doses cost more. Each KwikPen contains 4 weekly doses. Online consultation fees may be included or charged separately (£25–£50).
How do I access Mounjaro privately without NHS referral?
You can access Mounjaro through a GPhC-registered online pharmacy. Complete an online consultation with a UK-licensed prescriber who will assess your eligibility based on BMI and health conditions. If approved, a prescription is issued and your medication is dispensed — typically within 5–7 working days.
Is Mounjaro cheaper than Wegovy in the UK?
Cost comparison depends on dose and provider, but both typically range £129–£320/month privately. Mounjaro and Wegovy are different medications with different mechanisms — Mounjaro is a dual GIP/GLP-1 agonist, Wegovy is GLP-1 only. Your prescriber will advise which is most suitable based on your individual health assessment.
What if my NHS area doesn't offer Mounjaro yet?
You can access Mounjaro privately without waiting for NHS availability. Contact a GPhC-registered online pharmacy to arrange a consultation. Alternatively, ask your GP to enquire whether your local tier 3 weight management service plans to offer Mounjaro in the future — NICE guidance continues to expand NHS access.
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.