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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Will Mounjaro Get Cheaper in the UK?
Mounjaro (tirzepatide) is currently available in the UK through NHS specialist services and private prescription routes, with costs varying depending on where you access it. Whether the price will decrease depends on several factors including NHS commissioning decisions, patent status, and market competition. This guide explains current Mounjaro pricing in the UK and what might influence future costs. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses while considering the investment required.
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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.
Current Mounjaro Pricing and Access Routes in the UK
Private prescription cost: Mounjaro typically costs between £129 and £320 per month through private online prescribing services, depending on your dose. The starting dose (2.5 mg) is usually cheaper than higher maintenance doses (15 mg). Each KwikPen contains four weekly injections.
NHS access: If prescribed through NHS specialist tier 3 or tier 4 weight management services, Mounjaro is provided free at point of use. However, NHS availability is extremely limited and waiting lists are very long in most regions — in many areas, access via NHS is not currently available.
- Private costs include the injection and the clinical assessment fee
- NHS access requires GP referral to specialist weight management services
- Cost per dose decreases slightly as you titrate to higher maintenance doses
- Storage costs (refrigeration) are your responsibility with private prescriptions
Compare this with our BMI calculator to understand whether you meet NHS eligibility thresholds (BMI 30+, or 27+ with weight-related health conditions).
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.
Factors That Could Affect Mounjaro Costs in the Future
Patent expiry: Mounjaro's patent protection will eventually expire, typically allowing generic versions. However, this is unlikely to occur before 2036–2038, meaning prices may remain relatively stable for several years.
NHS NICE decisions: If NICE approves wider NHS funding or commissioning increases, availability may improve — though this doesn't assures price reductions for private users.
Market competition: As other GLP-1 and dual agonist medications enter the market, competitive pricing may eventually lower costs. Currently, Wegovy (semaglutide) offers a GLP-1 alternative with similar efficacy but different dosing.
Track your weight loss journey with our free progress tracker while you decide on the best option for your circumstances. Your GP can also discuss whether NHS referral or private treatment is most appropriate for you.
- 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 for free in the UK?
Mounjaro can be prescribed through NHS specialist weight management services (tier 3/4) at no cost to the patient. However, NHS availability is severely limited and waiting lists are extremely long in most regions. Many areas currently have no NHS Mounjaro access. Private prescription is currently the more accessible route for most people.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs between approximately £129–£320 per month depending on your dose and provider. Starting doses (2.5 mg) are cheaper than maximum doses (15 mg). This cost includes the prescription consultation and the KwikPen injection. Prices vary between providers, so it's worth comparing.
Will Mounjaro become cheaper when generics are available?
Yes, generic tirzepatide will likely be significantly cheaper once Eli Lilly's patent expires, expected around 2036–2038. Until then, prices are unlikely to drop substantially unless NHS funding increases dramatically or new competitors enter the market at lower price points.
What's the difference between Mounjaro and Wegovy in terms of cost?
Both medications cost similarly through private prescription (£150–£300/month). However, they use different mechanisms — Mounjaro is a dual GIP/GLP-1 agonist; Wegovy is a GLP-1 agonist only. Your prescriber will assess which is more suitable for you based on clinical factors, not cost.
Could NHS costs affect private Mounjaro pricing?
Potentially. If the NHS significantly increases Mounjaro commissioning and purchasing volume, this could influence bulk pricing and indirectly affect private sector pricing. However, currently the NHS market for Mounjaro is very small due to limited availability, so this isn't expected to drive near-term price changes.
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.