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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Is Mounjaro Price Increasing in the UK?
Mounjaro (tirzepatide) pricing in the UK can vary significantly depending on whether you're accessing it through the NHS or private prescription services. While there's no single "official" price increase, costs have fluctuated as demand has grown and supply chains have stabilised. Understanding current pricing, what influences costs, and your access options can help you make an informed decision about whether prescription weight loss treatment is right for you. Let's break down what you need to know about Mounjaro costs in 2025.
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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.
What Affects Mounjaro Pricing in the UK?
Several factors influence how much you'll pay for Mounjaro in the UK. Dose level is the primary driver — higher doses (up to the maximum 15 mg weekly) cost more than lower starting doses (2.5 mg). Private vs NHS access creates the biggest price variation: NHS prescription through specialist weight management services is typically free at point of use, though waiting lists can be several months to over a year depending on your region. Private online prescribing usually costs between £129 and £320 per month depending on your dose and the provider. Supply chain factors, including manufacturing capacity and import logistics, have caused price fluctuations since Mounjaro's UK launch. Pharmacy margins vary between GPhC-registered providers, meaning the same dose from different services may have different costs. Demand remains high, which can affect availability and pricing on the private market.
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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.
Private vs NHS Access — Cost Comparison
If you're accessing Mounjaro privately through an online prescriber, you'll typically pay per KwikPen (which contains 4 weekly doses). Starter doses (2.5 mg) tend to be cheaper than maintenance doses (10–15 mg). Most private providers quote monthly costs that include the consultation, prescription, and medication. NHS access is free but requires referral to a specialist tier 3 or tier 4 weight management service, where your GP assesses whether you meet eligibility criteria (BMI 30+ or BMI 27–29.9 with weight-related health conditions). There are currently no NHS-wide shortages of Mounjaro, but regional availability and waiting times vary considerably. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, and check with your GP about NHS options in your area before pursuing private prescribing.
- 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 2024–2025?
Prices have generally remained stable or slightly increased on the private market as demand remains high and supply has become more secure. Early 2023 saw severe shortages and higher prices; this has now normalised. Private costs currently range from £129–£320 monthly depending on dose. Always check current pricing with providers, as costs can vary week to week.
Why is Mounjaro more expensive than some other weight loss injections?
Tirzepatide (Mounjaro) is a dual GIP and GLP-1 receptor agonist, meaning it works through two hormone pathways rather than one. This dual mechanism may require more complex manufacturing. Compare costs with semaglutide (Wegovy) or liraglutide (Saxenda) — all are prescription-only and priced similarly on the private market.
Can I get Mounjaro free on the NHS?
Yes, if you meet eligibility criteria and are referred to an NHS specialist weight management service. However, NHS access is limited by service capacity and regional variation. Waiting times can exceed 12 months in some areas. Your GP can advise whether you qualify and what the wait is in your region.
What's included in the private Mounjaro cost?
Private costs typically include the online consultation with a UK-licensed prescriber, the prescription itself, and the medication KwikPen. Some providers bundle delivery; others charge separately. Always clarify what's included before purchasing. Costs are per KwikPen (4 weeks' supply at your current dose).
Does Mounjaro price vary between private providers in the UK?
Yes, significantly. GPhC-registered online pharmacies set their own prices, so the same dose of Mounjaro can cost different amounts from different providers. Shopping around is worth doing. Always ensure the provider is GPhC-registered and requires a genuine clinical assessment before prescribing.
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.