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 Compare Prices — NHS and Private Routes in the UK
Understanding Mounjaro pricing in the UK depends on whether you access it through the NHS or privately. Prescription-only tirzepatide (the active ingredient in Mounjaro) is available through both routes, but costs, eligibility, and timescales differ significantly. This guide explains the price comparison and helps you understand your options as a UK adult considering weight management treatment.
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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.
NHS Access and Mounjaro Costs
NHS Mounjaro access is free at the point of use, but availability is limited and regional. You'll need referral to a tier 3 specialist weight management service through your GP — standard GP surgeries do not prescribe Mounjaro. NICE has approved tirzepatide for NHS specialist weight management services, but access varies significantly by Integrated Care Board (ICB).
- You must meet NHS eligibility: BMI ≥30, or BMI 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, cardiovascular disease, or sleep apnoea)
- Waiting times for tier 3 services range from months to years depending on your area
- Once prescribed, your GP manages ongoing supply and monitoring at no cost
- Monthly blood tests and clinical reviews are included as part of NHS care
- Dose titration follows the standard Mounjaro KwikPen schedule: 2.5 mg rising to 15 mg maximum over 20 weeks
Check your local ICB website to understand current NHS access in your region — availability is not universal.
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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.
Private Mounjaro Pricing and Timeline
Private Mounjaro costs approximately £130–£320 per month depending on dose, with costs increasing as you titrate to higher doses. A 2.5 mg starting KwikPen typically costs £129–£150; a 15 mg maintenance KwikPen may cost £250–£320. Each KwikPen supplies four weekly doses. Private access requires an online consultation with a UK-licensed prescriber (usually within 24–48 hours), a prescription, and dispensing by a GPhC-registered pharmacy. You can start treatment immediately without NHS referral or waiting lists. Use our free GLP-1 weight loss calculator to estimate projected outcomes and compare against potential costs over time.
- 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.
How much does Mounjaro cost on the NHS?
Mounjaro is free on the NHS if you're accepted into a specialist tier 3 weight management service, but you need GP referral and must meet eligibility criteria (BMI ≥30, or 27–29.9 with health conditions). Access varies by region and waiting times can be lengthy. Once prescribed, all ongoing doses and clinical monitoring are NHS-funded.
What's the average private cost for Mounjaro in the UK?
Private Mounjaro costs between £130–£320 per month depending on your dose. Starting doses (2.5 mg) are cheaper at around £129–£150 per KwikPen; maximum doses (15 mg) cost £250–£320. Each pen supplies four weeks of once-weekly injections. Total annual cost ranges from approximately £1,500–£3,800 depending on your maintenance dose.
Can I get Mounjaro faster through private than NHS routes?
Yes. Private online prescribing typically delivers treatment within 24–48 hours of consultation, with no waiting list. NHS specialist services often have waiting times of several months to over a year, depending on your region. If speed is important, private access is significantly faster, though at a cost.
Does private Mounjaro pricing include clinical monitoring?
No. Private prescriptions provide the medication and initial consultation, but ongoing monitoring is not always included. You may need to pay separately for GP blood tests or follow-up consultations. Some private providers offer tiered packages including monitoring; check with your chosen provider. NHS access includes all clinical reviews and monitoring at no additional cost.
Why does Mounjaro cost less on the NHS if it's the same tirzepatide?
The NHS negotiates bulk pricing with manufacturers, resulting in lower unit costs than private pharmacies. Private providers include consultation fees, pharmacy margins, and delivery costs. Additionally, the NHS spreads costs across the health system, whereas private patients pay directly. The medication itself is identical; cost differences reflect different service models and pricing arrangements.
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.