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 Price Drop in the UK — What You Need to Know
Mounjaro (tirzepatide) pricing in the UK has become more accessible as the medication has gained NHS approval and more private providers offer it. Costs vary significantly depending on whether you access it through the NHS specialist weight management services or via private prescription. Understanding your options and what influences the price can help you make an informed decision about whether this weight loss treatment is right for you. This guide explains the current UK pricing landscape and how to access Mounjaro affordably.
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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.
Private Mounjaro Costs in the UK
Private Mounjaro costs in the UK typically range from £129 to £320 per month, depending on your starting dose and the provider. A standard 2.5 mg starter KwikPen (four doses) costs around £129–£150, whilst higher maintenance doses like 15 mg can cost £250–£320 monthly. The variation reflects different provider margins and service models — some offer clinical support and ongoing monitoring, whilst others provide prescription-only services at lower cost.
Each KwikPen contains four weekly injections (one month's supply). As you titrate upwards through dose escalation, your monthly cost increases. Many private providers now offer payment plans or loyalty discounts for patients continuing treatment. Unlike the NHS, private prescriptions are dispensed quickly — usually within 2–3 working days — and you can start treatment without waiting lists.
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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.
NHS Access vs Private Routes to Mounjaro
NHS route: Mounjaro is now available through NHS specialist tier 3 and tier 4 weight management services following NICE approval. However, access is limited — you must be referred by your GP and meet strict eligibility criteria (BMI ≥30, or ≥27.5 with weight-related health conditions). Waiting lists for NHS specialist services vary significantly by region; some areas have waits exceeding 18 months. Once approved, NHS provision is free, but availability depends on your local Integrated Care Board (ICB).
Private route: Faster access through online consultations with UK-licensed prescribers. A clinical assessment typically costs £25–£50 and takes 24–48 hours. If approved, your prescription is dispensed by a GPhC-registered pharmacy. No waiting list, and you can start immediately. Use our GLP-1 weight loss calculator to estimate potential results at different doses, and our BMI calculator to confirm your eligibility before booking a consultation.
---COL_J_ALTERNATE---NHS route: Mounjaro is available through NHS specialist tier 3 and tier 4 weight management services following NICE approval. You must be referred by your GP, meet strict eligibility criteria (BMI ≥30 or ≥27.5 with health conditions), and provision is free once approved. However, waiting lists vary widely by region — some areas have waits exceeding 18 months, and availability depends on your local ICB funding.
Private route: Faster access through online consultations with UK-licensed prescribers in 24–48 hours. Clinical assessment costs £25–£50; if approved, your prescription is dispensed within 2–3 days by a GPhC-registered pharmacy. No waiting list and immediate start. Use our free BMI calculator to confirm your eligibility before booking a consultation with a prescriber.
- 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.
Why has Mounjaro become more affordable in the UK recently?
Following NICE approval and increased competition from multiple private providers, Mounjaro pricing has become more transparent and competitive. NHS access through specialist services has also expanded, offering free provision to eligible patients, which has driven down overall market pricing as providers compete for patients.
Is there a price difference between Mounjaro and Wegovy in the UK?
Not significantly. Both are prescription-only GLP-1/GIP medications with similar private pricing (typically £129–£320/month depending on dose). Mounjaro is tirzepatide; Wegovy is semaglutide. Your prescriber will assess which is more suitable based on your individual health, not cost.
Can I get Mounjaro on the NHS for free in the UK?
Yes, through NHS specialist weight management services if you meet eligibility criteria. However, access varies by region and waiting lists can be lengthy. Your GP can refer you to your local specialist service, but availability and timelines depend on your local ICB's funding and capacity.
What's included in the private Mounjaro cost?
The quoted price is usually for the medication (KwikPen) only. Clinical assessment (consultation with prescriber) may be charged separately (£25–£50). Some providers include ongoing support or follow-up consultations; others do not. Always check what's included before purchasing.
How long does a KwikPen last and how does that affect cost?
Each KwikPen contains four weekly injections (one month's supply). Your monthly cost depends on your dose — starter doses cost less, but as you titrate upwards to maintenance doses (typically 10–15 mg), monthly costs increase. Budget approximately £129–£320/month depending on your current dose level.
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.