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 Weight Loss Price Increase in the UK
Mounjaro (tirzepatide) costs have increased significantly in the UK during 2024, and if you're considering this weekly weight loss injection, understanding the pricing is essential. The cost of Mounjaro varies depending on your dose, where you access it (NHS specialist services or private prescription), and your provider. This guide explains current UK pricing, why costs have risen, and what you can expect to pay.
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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.
Current Mounjaro Pricing in the UK
Private prescription pricing: Mounjaro typically costs between £150 and £320 per month in the UK through private prescribing services, depending on your dose. The 2.5 mg starting dose is usually at the lower end, whilst the 15 mg maximum dose is at the higher end. Individual private pharmacies set their own prices, so costs vary between providers.
- 2.5 mg dose: approximately £150–£180 per month
- 5–10 mg doses: approximately £200–£260 per month
- 12.5–15 mg doses: approximately £260–£320 per month
NHS access: Through NHS specialist weight management services, Mounjaro is free at the point of use if you meet eligibility criteria. However, NHS availability is extremely limited and varies significantly by region. Waiting times can be many months.
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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.
Why Has Mounjaro Become More Expensive?
Several factors have driven price increases for Mounjaro in the UK:
- Manufacturing and supply costs: Global demand for GLP-1 medications has dramatically increased, affecting production and distribution costs
- Ingredient costs: Tirzepatide is a complex synthetic peptide requiring expensive manufacturing processes
- Pharmacy margins: As demand exceeds supply, some providers have adjusted pricing upward
- Currency fluctuation: Most pharmaceutical manufacturing occurs overseas, making UK prices vulnerable to exchange rate changes
Private providers typically review pricing monthly or quarterly based on their acquisition costs from wholesalers.
- 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 more expensive than Wegovy?
Pricing varies by provider and dose. Generally, Mounjaro and Wegovy (semaglutide) have similar private prescription costs—both typically range from £150–£320 per month depending on dose. Always compare current pricing from multiple providers before deciding, as costs change regularly.
Can I access Mounjaro cheaper through the NHS?
Yes—Mounjaro is free through NHS specialist weight management services if you meet eligibility criteria (BMI 30+ or 27+ with weight-related health conditions). However, NHS access is extremely limited and varies by region. Ask your GP about referral to tier 3 weight management services in your area.
Why does the starting dose cost less than higher doses?
The 2.5 mg starting dose contains less active ingredient than the 15 mg maximum dose. Each KwikPen contains the same volume but different concentrations, so higher doses cost proportionally more to manufacture and supply.
Do I have to pay full price every month?
If accessing through a private prescription, yes—most UK providers charge monthly subscription or per-dose pricing. Some offer slight discounts for paying upfront or committing to longer-term treatment, but this varies by provider.
What does the cost include?
Private prescription pricing typically covers the KwikPens, clinical assessment, prescription, and delivery. Check with your chosen provider about whether additional GP support, progress monitoring, or lifestyle guidance is included in their package.
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.