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) pricing in the UK has been subject to cost pressures in 2024 and 2025. Whether you're accessing Mounjaro through the NHS or privately, it's important to understand how pricing affects availability and your options. This guide covers what's changed, how it impacts NHS eligibility and tier 3 specialist services, private prescription costs, and what alternatives exist. We'll also help you understand whether Mounjaro remains the right choice for your weight management journey using evidence-based information aligned with NHS guidance.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
NHS Access, NICE Guidance, and Mounjaro Availability
NICE approved tirzepatide (Mounjaro's generic name) for NHS use within specialist tier 3 weight management services in 2023, alongside semaglutide. However, NHS availability remains highly variable across UK regions. Cost pressures affecting pharmaceutical supply chains have influenced Mounjaro availability through NHS services, and some integrated care boards (ICBs) have prioritised access based on clinical need and BMI thresholds.
NHS eligibility for tirzepatide typically requires:
- BMI of 30 kg/m² or above (or 27+ with weight-related health conditions)
- Referral to a tier 3 specialist weight management service
- Assessment by a multidisciplinary team
- Failure or inability to lose weight through lifestyle interventions alone
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds may apply. Waiting times for NHS specialist services vary significantly — some regions have waiting lists of 6–24 months. Use our free GLP-1 weight loss calculator to estimate potential outcomes, and our BMI calculator to check your current eligibility threshold.
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.
Private Mounjaro Costs and Alternative Routes in 2025
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month depending on dose and provider, though pricing varies. A standard course of Mounjaro via private online prescribing requires a clinical assessment from a UK-licensed prescriber, then dispensing by a GPhC-registered pharmacy — no NHS referral needed.
Compared to Wegovy (semaglutide), both are GLP-1-based but Mounjaro is a dual GIP/GLP-1 agonist, offering a different mechanism. Clinical trials showed Mounjaro achieved approximately 15–21% average body weight loss, though individual results vary. Many people explore both Mounjaro vs Wegovy options before deciding. Cost should never be your only factor — clinical suitability assessed by a prescriber is essential. Track your weight management progress using our free progress tracker alongside any medication.
- 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.
Has Mounjaro become more expensive in 2025?
Pricing pressures on injectable weight loss medications are evident across the UK market in 2024–2025. NHS availability varies by region due to cost considerations. Private prescription costs remain broadly £129–£320 monthly depending on dose. Contact providers directly for current pricing, as costs fluctuate based on supply and regional policies.
Can I get Mounjaro free on the NHS in 2025?
Yes, NICE recommends tirzepatide for NHS specialist weight management services. However, availability depends on your local ICB and referral to a tier 3 service. Waiting lists can be long (6–24 months in many regions). Ask your GP about referral options in your area.
What's the difference between Mounjaro and Wegovy for UK weight management?
Mounjaro is a dual GIP/GLP-1 agonist; Wegovy (semaglutide) is GLP-1 only. Clinical trials showed Mounjaro achieved 15–21% average weight loss versus Wegovy's ~15%. Both are prescription-only and available via NHS specialist services or private prescription. Individual results vary significantly.
How much does Mounjaro cost privately in the UK?
Private Mounjaro typically costs £129–£320 per month depending on dose. Prices vary between providers and change over time. You'll need a prescription from a UK-licensed prescriber following clinical assessment. Always confirm current costs with providers before starting.
What happens if I can't afford Mounjaro privately or can't wait for NHS access?
Explore NHS tier 3 referral options through your GP first. Ask about waiting times in your area. For immediate access, private online prescribing is available if clinically suitable. You could also discuss alternatives (lifestyle support, other tier 2 services, or other medications) with your GP while waiting.
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.