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 Increase 2025 in the UK
Mounjaro (tirzepatide) prices in the UK have fluctuated as demand for GLP-1 weight loss injections continues to rise. If you're considering this prescription-only medication, understanding the current cost and your access options—whether through the NHS or private prescription—is essential. This guide explains what Mounjaro costs in 2025, why prices vary, and how to access it in the UK. Use our GLP-1 weight loss calculator to explore potential outcomes, and speak with your GP about eligibility.
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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.
Private Mounjaro Costs in the UK
Private prescription costs for Mounjaro vary significantly depending on your dose, the provider, and whether you're starting treatment or continuing an established dose. In 2025, private Mounjaro typically costs between £129 and £320 per month for most patients, though costs at higher doses (12.5 mg and 15 mg) may be higher. The price reflects the cost of the medication itself, the clinical assessment required before prescription, and the pharmacy's operational costs. Doses like 2.5 mg and 5 mg are usually at the lower end of this range, whilst maintenance doses (10 mg to 15 mg) tend to cost more. Many private providers offer tirzepatide alongside lifestyle support, which may add to the total cost. It's important to note that prices are not regulated in the private market, so checking with several GPhC-registered online pharmacies for current pricing is wise before committing.
- Starting doses (2.5–5 mg): Often £129–£180 per month
- Mid-range doses (7.5–10 mg): Typically £170–£240 per month
- Higher doses (12.5–15 mg): Usually £240–£320+ per month
- Clinical assessment fee: May be included or charged separately (£30–£80)
- Follow-up consultations: Some providers include these; others charge per consultation
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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 vs Private Access in 2025
In the UK, Mounjaro is available through two main routes: the NHS and private prescription. NHS access requires referral to a specialist tier 3 or tier 4 weight management service from your GP, which can involve significant waiting lists (many regions have waits of 6–24+ months). Private prescription access is faster—typically within 1–2 weeks—but you pay the full cost yourself. The NHS route is free once approved, making it the more affordable option if you can access it. However, private prescription allows you to start treatment immediately without NHS referral. Eligibility is similar for both routes: a BMI of 30+ or 27+ with weight-related health conditions (type 2 diabetes, high blood pressure, sleep apnoea). Your online consultation with a private prescriber will assess your suitability, medical history, and contraindications before issuing a prescription to a GPhC-registered pharmacy. Track your progress using our free progress tracker, and use our BMI calculator to check where you stand against NHS thresholds.
- 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 did Mounjaro prices increase in 2025?
Global demand for tirzepatide has driven costs up as supply remains constrained. Manufactured by Eli Lilly, Mounjaro is a relatively new medication for weight management. Market competition, manufacturing capacity, and fluctuating pound sterling exchange rates also influence UK pricing. NHS NICE approval has increased demand, which affects private market pricing.
Is Mounjaro covered by the NHS in 2025?
Yes, NICE approved tirzepatide (Mounjaro) for NHS use in specialist weight management services. However, NHS access varies significantly by region and involves referral through tier 3 services. Waiting times remain long in many areas. Private prescription offers faster access but at full cost to you.
What's included in the private Mounjaro price?
The stated price usually covers the tirzepatide injection itself and the clinical assessment by a UK-licensed prescriber. Follow-up consultations, dose adjustments, and ongoing support may be included or charged separately. Always check what's included with your chosen provider before purchasing.
Can I get a cheaper Mounjaro prescription through the NHS?
Yes—if you're eligible and can access an NHS specialist weight management service, there is no cost to you. However, waiting lists are long. Your GP can refer you, but availability depends on your local Integrated Care Board (ICB) and region.
How do I know if I'm eligible for Mounjaro in the UK?
You're eligible if you have a BMI of 30 kg/m² or above, or 27+ with a weight-related condition like type 2 diabetes, high blood pressure, or sleep apnoea. Lower thresholds apply for South Asian, Chinese, Black African, and Black Caribbean adults. A GP or private prescriber will assess your full eligibility during consultation. Use our BMI calculator to check your starting point.
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.