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 UK Price Increase — What You Need to Know
Eli Lilly's Mounjaro (tirzepatide) pricing in the UK has been subject to changes, affecting both NHS availability and private prescription costs. Understanding the current cost structure and your access options is essential when considering this weight management injection. Whether you're exploring NHS routes through specialist services or private online prescribing, this guide explains what you can expect to pay and how pricing impacts your access to 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.
Mounjaro Costs in the UK — Private and NHS Routes
Private prescription costs for Mounjaro typically range from £129 to £320 per month, depending on the dose you're prescribed and the provider. Starting doses (2.5 mg) are usually at the lower end of this range, while maintenance doses (10–15 mg) command higher prices. Costs may also vary if you're purchasing a full month's supply (4 KwikPen devices) versus single pens.
Recent price adjustments by Eli Lilly have reflected manufacturing and supply chain factors. Private online prescribers are required to conduct a clinical assessment before issuing a prescription, ensuring the tirzepatide dose is appropriate for your health profile. Many providers offer subscription models, which may provide modest savings compared to one-off purchases. Always request pricing transparency before committing — costs vary significantly between registered pharmacy providers.
- Private dose range: 2.5 mg to 15 mg weekly injection
- Average private cost: £129–£320/month depending on dose
- Prescription required from UK-licensed prescriber
- GPhC-registered pharmacy dispensing mandatory
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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 — Timelines and Availability
NHS access to Mounjaro is through specialist tier 3/4 weight management services, not routine GP prescription. You'll typically need a referral from your GP, though eligibility and waiting times vary significantly by region and integrated care board (ICB). Some areas have lengthy waiting lists — months to over a year in many NHS trusts. NICE has approved tirzepatide for NHS use in eligible adults with a BMI ≥30 or BMI ≥27 with weight-related health conditions, but regional commissioning decisions affect actual availability.
Private prescription access is faster — often within days of online consultation. You'll be assessed by a licensed prescriber, issued a prescription if suitable, and have it dispensed by a GPhC-registered pharmacy. Private costs are your responsibility but offer immediate access without NHS waiting lists. Consider both routes: NHS access is free at point of use for eligible patients, but private offers speed if you prefer not to wait.
- 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 pricing increased in the UK?
Pricing changes reflect Eli Lilly's manufacturing, supply chain, and regulatory costs. GLP-1 medications have seen global demand surge, affecting production and pricing. The UK market has experienced adjustments as NHS commissioning and private supply stabilise. Always check current pricing with providers, as costs continue to evolve.
Can I get Mounjaro on the NHS for free?
Yes, if eligible and referred to an NHS specialist weight management service. You must have a BMI ≥30 or BMI ≥27 with weight-related health conditions. However, regional availability varies — some areas have limited NHS provision. Waiting times can be substantial. Your GP can advise on NHS routes in your area.
What's included in the monthly private cost of Mounjaro?
Private costs typically cover the prescription fee, clinical assessment, and the medication itself (usually 4 KwikPen devices per month supply). Some providers include follow-up support or lifestyle guidance. Check what's included before purchasing — additional costs may apply for extra consultations or expedited delivery.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is generally comparable, though costs vary by dose and provider. Both tirzepatide (Mounjaro) and semaglutide (Wegovy) are prescription-only and priced differently by each pharmacy. Compare quotes from multiple GPhC-registered providers — don't assume one is significantly cheaper without checking current rates.
How do I check if I'm eligible for NHS Mounjaro?
Speak to your GP, who can assess your BMI, health conditions, and local NHS commissioning. NHS eligibility requires BMI ≥30 or ≥27 with comorbidities (type 2 diabetes, hypertension, cardiovascular disease). Your GP can refer you to specialist services if appropriate. Online tools like our free BMI calculator can help you understand your starting point before your GP appointment.
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.