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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Best Mounjaro in the UK — Cost and Access Guide
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding how to access it and what it costs is essential. Mounjaro is available through both NHS specialist services and private prescription routes, each with different eligibility criteria, timelines, and costs. This guide explains your options, helps you understand the prescription process, and shows you how to check if you might be eligible. Whether you're exploring NHS access or private options, knowing the facts helps you make an informed decision.
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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.
Understanding Mounjaro Costs and NHS vs Private Access in the UK
Private prescription costs: Mounjaro via private prescription typically costs between £150 and £280 per month, depending on the dose you're prescribed. Starting doses (2.5 mg) are usually at the lower end of this range, whilst higher maintenance doses (10–15 mg) cost more. Each KwikPen contains 4 weekly injections and prices vary between prescribers and pharmacies. Private access usually involves an online consultation with a UK-licensed prescriber (£20–£50), who will assess your eligibility based on your BMI, health conditions, and medical history. If approved, your prescription is sent to a GPhC-registered pharmacy for dispensing.
- NHS specialist access: Through NHS weight management services (tier 3), Mounjaro is available free at point of care if you meet NICE criteria. However, NHS access varies significantly by region and waiting lists can be months to years long in many areas.
- Eligibility threshold: Adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, cardiovascular disease, sleep apnoea) may be eligible for either route.
- Ethnicity considerations: For South Asian, Chinese, Black African, and Black Caribbean adults, lower BMI thresholds (27.5+) may apply due to higher health risks at lower weights.
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.
How to Access Mounjaro — NHS Route vs Private Prescription
NHS route: Ask your GP for a referral to a tier 3 specialist weight management service. Your local ICB (Integrated Care Board) will have a commissioning pathway; ask your GP about waiting times and current service availability. Services typically require an initial assessment, lifestyle support, and ongoing monitoring. This is the most cost-effective route but involves longer waits in most regions.
Private route: Use our free GLP-1 weight loss calculator above to understand potential outcomes, then arrange an online consultation with a UK-licensed prescriber. You'll complete a health questionnaire, have a brief video or phone consultation, and receive a prescription decision within 24–48 hours if approved. Your prescription is dispensed by post from a regulated pharmacy. This route is faster but involves upfront costs.
Both routes require a proper clinical assessment—never purchase Mounjaro without a valid UK prescription.
- 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 (tirzepatide) is approved by NICE for NHS use within specialist tier 3 weight management services. However, availability varies by region and waiting lists can be very long. You'll need a GP referral to access NHS specialist services.
How much does Mounjaro cost privately in the UK?
Private Mounjaro typically costs £150–£280 per month depending on dose. Starting doses are cheaper; maintenance doses (10–15 mg) are more expensive. Costs vary between prescribers and pharmacies. Check our BMI calculator to understand if you might be eligible.
What's the difference between NHS and private access to Mounjaro?
NHS access is free but involves referral, assessment, waiting lists (often months), and regional variation. Private access is faster (48 hours) but costs £150–£280 monthly. Both require clinical assessment and a valid prescription from a UK-licensed prescriber.
How long does the online consultation process take for private Mounjaro?
Most private online consultations take 10–20 minutes. You'll complete a health questionnaire before the appointment. A decision is usually given within 24–48 hours. If approved, your prescription is sent to a pharmacy and posted to you within 3–5 working days.
What's the difference between Mounjaro and Wegovy in terms of UK access and cost?
Both are prescription-only with similar private costs (£150–£280/month) and NHS access through specialist services. Mounjaro is a dual GIP/GLP-1 agonist; Wegovy is GLP-1 only. Mounjaro has higher average weight loss in trials (~21% vs ~15%), but individual results vary. Your prescriber will advise which suits you best.
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.