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- 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 Change in the UK — What You Need to Know
Mounjaro (tirzepatide) is a prescription-only weight management injection, and pricing has shifted recently in the UK private market. If you're considering this dual GIP/GLP-1 medication, understanding current costs and how to access it — whether through NHS specialist services or private online prescribing — is essential. This guide explains UK pricing, regional variations, and what affects your cost for a Mounjaro KwikPen.
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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.
Current Mounjaro Pricing in the UK Private Market
Mounjaro costs vary significantly depending on the dose and where you obtain it. Private UK prescription costs currently range from approximately £129 to £320 per month, depending on your dose and the prescribing provider. Starting doses (2.5 mg and 5 mg) tend to be at the lower end of this range, whilst higher maintenance doses (10–15 mg) cost more. Each KwikPen contains 4 weekly injections, so monthly costs reflect a 4-week supply. It's important to note that prices are not fixed across all providers — different GPhC-registered online pharmacies set their own rates. Some providers offer bulk purchase discounts or subscription models. Mounjaro pricing has been affected by increased demand, supply chain factors, and currency fluctuations. Always check the current price with your chosen prescriber before committing, as rates can change. The cost typically includes the clinical assessment consultation and prescription, though this varies by provider.
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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 Access vs Private Prescription Routes
NHS route: NICE has approved tirzepatide for use within NHS specialist weight management services (tier 3/4). However, NHS access is heavily dependent on your region and service availability — waiting lists can exceed 12 months in many areas. Your GP can refer you to a specialist weight management service if you meet the criteria (BMI ≥30, or BMI 27–29.9 with weight-related health conditions). There is no NHS cost to you once prescribed, but accessing it requires a formal referral and assessment.
Private route: You can access Mounjaro privately through a UK-licensed online prescriber without an NHS referral. An online consultation takes 10–15 minutes, assessing your health, medications, and eligibility. If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy. This route is faster (often within days) but involves private costs. Use our free GLP-1 weight loss calculator to explore potential results and costs at different doses before starting.
- 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 has Mounjaro price changed recently in the UK?
Mounjaro pricing has increased due to higher global demand, supply constraints, and currency effects on imported medications. The dual mechanism (GIP+GLP-1) positioning has also driven uptake, affecting availability and costs. Prices continue to stabilise as supply increases.
What's included in the private prescription cost for Mounjaro?
The cost typically includes the online clinical consultation, GP assessment, prescription issuance, and the medication itself (one KwikPen per month). Some providers bundle these; others charge separately. Always confirm what's included before paying.
How much does Mounjaro cost on the NHS in the UK?
If prescribed through the NHS, Mounjaro is free at the point of care (no cost to you). However, NHS access is limited by regional availability and waiting lists. You need a GP referral to a tier 3 specialist weight management service to be considered.
How do I compare Mounjaro cost to Wegovy in the UK?
Wegovy (semaglutide) typically costs £129–£250/month privately, slightly less than Mounjaro at comparable doses. Both require private prescriptions for fast access. Clinical outcomes differ individually — use our GLP-1 weight loss calculator to compare potential results between the two.
Is Mounjaro cheaper if I buy multiple pens in advance?
Some private providers offer discounts for purchasing multiple KwikPens upfront (e.g., 3–6 months supply). However, storage and shelf-life limitations apply — unopened pens must be refrigerated at 2–8°C. Always check expiry dates and storage requirements before bulk purchasing.
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.