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 Cost Changes in September — What You Need to Know
Mounjaro (tirzepatide) prices do fluctuate in the UK private market, particularly as demand for GLP-1 medications remains high. If you're considering this prescription-only injection for weight management, it's important to understand current pricing, why costs may change, and your options for accessing it through the NHS or private prescription routes. This guide explains the UK cost landscape for Mounjaro and how to find the most current pricing information available to you right now.
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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.
Mounjaro Pricing in the UK Private Market
Private Mounjaro costs in the UK vary by dose and provider, typically ranging from £129 to £320 per month depending on which dose you're prescribed (starting doses like 2.5mg are generally less expensive than higher maintenance doses like 15mg). Several factors influence these prices: stock availability, demand fluctuations, and individual pharmacy pricing models. Some providers may offer bundled packages or subscription discounts, so comparing costs across GPhC-registered online prescribing services is worthwhile.
Unlike Mounjaro in the US, UK pricing is not directly tied to manufacturer announcements or official price increases from Eli Lilly — instead, market dynamics and pharmacy margins determine what you pay. Prices can shift seasonally and based on supply constraints, which may explain variations you notice from month to month. It's also worth noting that if you're comparing Mounjaro vs Wegovy costs, semaglutide injections sometimes differ in price despite similar mechanisms, so shopping around is advisable.
- Private Mounjaro typically costs £129–£320/month depending on dose
- Prices vary by GPhC-registered provider — not a fixed NHS rate
- Higher doses (10mg, 15mg) cost more than starter doses (2.5mg, 5mg)
- Subscription discounts or packages may reduce per-dose costs
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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.
Accessing Mounjaro — NHS vs Private Routes
The NHS route requires referral to a specialist tier 3 or tier 4 weight management service, usually through your GP. However, NHS availability varies significantly by region and waiting lists can be lengthy — sometimes 6–12 months or longer depending on your local Integrated Care Board (ICB). Once assessed and approved, Mounjaro on the NHS is free.
The private route is faster: you complete an online consultation with a UK-licensed prescriber, and if clinically appropriate, a prescription is issued and dispensed by a GPhC-registered pharmacy within days. Private prescription costs are your responsibility but avoid NHS waiting times. Both routes require a clinical assessment confirming you meet eligibility criteria (BMI ≥30, or BMI ≥27 with weight-related health conditions). Use our free GLP-1 weight loss calculator to estimate potential results, and our BMI calculator to check your starting point before pursuing either route.
- NHS: free but subject to regional availability and waiting lists
- Private: faster access (days), costs £129–£320/month, no referral needed
- Both require clinical assessment and prescription
- Eligibility based on BMI and health conditions
- 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 does Mounjaro cost more in September than earlier in the year?
Mounjaro pricing in the UK private market fluctuates due to supply and demand, not automatic manufacturer price increases like in some countries. September demand may increase as people plan autumn health changes, which can affect pricing across providers. Always check multiple GPhC-registered services for the best current rate.
Is Mounjaro cheaper on the NHS than through private prescription?
Yes — Mounjaro is free on the NHS once approved. However, NHS access requires referral to a specialist service and may involve significant waiting lists (months to over a year in some regions). Private prescription costs £129–£320/month but offers faster access without waiting.
Can I get a Mounjaro KwikPen prescription online in September 2024?
Yes. UK-licensed prescribers can issue Mounjaro prescriptions following an online clinical assessment if you meet eligibility criteria. GPhC-registered pharmacies will dispense the KwikPen device. You'll need to provide health information and have a consultation with the prescriber before a prescription is issued.
What dose of Mounjaro should I start with, and does it cost more as I increase?
You start with 2.5mg (the lowest cost) and increase gradually — minimum 4 weeks at each dose before escalating to 5mg, 7.5mg, 10mg, 12.5mg, or maximum 15mg. Costs increase with higher doses. Your prescriber will guide dose titration based on your tolerance and results.
Does Mounjaro eligibility change depending on the month or cost?
No. Eligibility is based on your BMI and health conditions, not on pricing or the time of year. You're eligible if you have a BMI ≥30 (or ≥27 with weight-related health conditions like type 2 diabetes or high blood pressure). Cost should not affect clinical eligibility decisions.
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.