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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Are Mounjaro Prices Going Up in the UK?
Mounjaro (tirzepatide) prices in the UK have fluctuated since its approval for weight management, and costs vary significantly depending on whether you're accessing it through the NHS or private prescribing. Private prices typically range from £129 to £320+ per month depending on your dose, while NHS access remains limited and varies by region. Understanding what affects Mounjaro pricing, why costs differ, and your options for accessing this prescription-only injection can help you make informed decisions about weight management. Our GLP-1 weight loss calculator can help estimate potential outcomes at different doses.
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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.
What Affects Mounjaro Costs in the UK?
Mounjaro pricing is influenced by several factors specific to the UK market. Dose level is the primary driver—starting doses (2.5 mg) cost less than maintenance doses (15 mg), which is the maximum. Supply source matters too: NHS specialist weight management services provide access without direct cost to patients, but availability is extremely limited and waiting lists can stretch months to years depending on your region. Private online prescribing through GPhC-registered pharmacies offers faster access but involves consultation fees and medication costs. Pharmacy competition also affects pricing—different providers charge different amounts for identical doses. Additionally, tirzepatide supply chains in Europe have experienced constraints since 2023, which can influence wholesale costs and retail pricing.
- Starting dose (2.5 mg): typically £129–£149/month privately
- Maintenance doses (10–15 mg): typically £249–£320+/month privately
- NHS access: no direct cost but extremely limited availability
- Prescription fee: online consultations typically £20–£50
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.
Has Mounjaro Become More Expensive?
Yes, Mounjaro prices have generally increased since launch in the UK in 2023. Initial pricing was competitive as suppliers competed for market share, but prices have stabilised and in many cases risen as demand outpaced supply. The KwikPen device (the pre-filled injection pen) is the standard format, and costs reflect manufacturing, distribution, and regulatory compliance. Compared to other GLP-1 medications like Wegovy (semaglutide), Mounjaro's pricing is broadly similar at equivalent dose strengths, though direct price comparisons vary by provider. If you're considering prescription weight loss treatment, check multiple providers and ask about dose escalation costs before committing, as prices can vary significantly. Your GP can also discuss NHS tier 3 specialist weight management services if you're eligible.
- 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 in the UK?
Pricing is similar at equivalent dose levels. Wegovy (semaglutide) at 2.4 mg and Mounjaro (tirzepatide) at 15 mg typically cost around £250–£320/month privately, though prices vary by provider. Always compare quotes from multiple GPhC-registered pharmacies before prescribing.
Why is Mounjaro so expensive on the NHS?
Mounjaro isn't necessarily "expensive" on the NHS—it's free to patients. However, NHS access is extremely limited because tier 3 specialist weight management services have restricted funding and long waiting lists. Many areas have very limited availability.
Can I get Mounjaro cheaper if I wait?
Prices are unlikely to drop significantly in the near term. Generic tirzepatide may eventually become available, which could lower costs, but this is several years away. Getting treatment sooner through NHS referral or private prescribing may be more practical.
Do Mounjaro prices include the prescription consultation fee?
No. Private prices (£129–£320/month) are for the medication only. Add £20–£50 for the online clinical consultation with a UK-licensed prescriber. Some providers bundle these; always check what's included.
Is there any way to reduce Mounjaro costs in the UK?
Starting on a lower dose reduces monthly cost. Some providers offer discounted rates for upfront payment of multiple doses. NHS access is free but requires referral to a specialist weight management service. Always discuss affordability with your prescriber.
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.