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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5mg Mounjaro Prices in the UK
The cost of 5mg Mounjaro in the UK varies significantly depending on whether you access it through the NHS or privately. Mounjaro (tirzepatide) is a prescription-only weight management injection, and pricing depends on your access route, the specific dose prescribed, and individual provider costs. This guide explains what you can expect to pay and how to access this medication in the UK.
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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.
How Much Does 5mg Mounjaro Cost?
Private prescription costs for 5mg Mounjaro typically range from £129 to £200 per month, though this varies between UK-registered online pharmacies and prescribing providers. The 5mg dose is usually the first escalation dose in the Mounjaro dosing schedule — most people start on 2.5mg for weeks 1–4, then move to 5mg for weeks 5–8. Each KwikPen contains 4 weekly injections (one month's supply).
Prices may vary based on:
- Which GPhC-registered pharmacy dispenses your prescription
- Whether you purchase a single pen or multiple pens upfront
- Promotional pricing or subscription discounts
- Additional consultation fees charged by prescribing services
It's worth comparing prices across registered providers, as costs can differ by £30–£50 per month. Always ensure any provider is MHRA-registered and GPhC-compliant before purchasing.
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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 and Private Routes
NHS access to Mounjaro is available through specialist tier 3 weight management services, but access varies significantly by region and depends on local ICB (Integrated Care Board) funding. NHS waiting lists can be lengthy — sometimes months or years. Your GP can refer you to your local specialist weight management service if you meet eligibility criteria: BMI 30 or above, or BMI 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure.
Private access is faster — you can arrange a consultation with a UK-licensed prescriber online, receive a prescription if appropriate, and have it dispensed within days by a registered pharmacy. Use our GLP-1 weight loss calculator to estimate potential outcomes at different tirzepatide doses.
Eligibility thresholds are lower for adults of South Asian, Chinese, Black African, or Black Caribbean heritage (starting at BMI 27.5 or above), as these groups face higher health risks at lower weight thresholds. Your prescriber will assess your individual circumstances — Mounjaro is not suitable for everyone. Always check the latest NICE guidance and consult your GP before starting any weight management 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.
Is 5mg Mounjaro available on the NHS?
Yes, Mounjaro is available through NHS specialist weight management services following NICE approval, but access varies by region. You'll need referral from your GP to your local tier 3 weight management service. Waiting times can be substantial in many areas.
Why does Mounjaro cost more than Wegovy in the UK?
Mounjaro and Wegovy have different mechanisms — Mounjaro is a dual GIP and GLP-1 agonist, while Wegovy is GLP-1 only. Manufacturing costs, demand, and market positioning influence pricing. Clinical trial data shows Mounjaro may produce slightly higher average weight loss, which can affect pricing strategy.
What's included in the 5mg Mounjaro price?
The price covers the pre-filled KwikPen device containing four weekly 5mg injections. Private prices typically include the medication only — consultation fees are charged separately by prescribing services. NHS prescriptions are dispensed at no additional cost to eligible patients.
Can I get cheaper Mounjaro by buying multiple pens?
Some private providers offer modest discounts for purchasing multiple pens upfront, though savings are usually small (£5–£15 per pen). Always compare prices across registered pharmacies. Avoid significantly discounted prices from unregistered sellers — ensure any provider is GPhC-registered.
How does 5mg Mounjaro dosing work?
5mg is the first maintenance dose in the Mounjaro titration schedule. You start on 2.5mg for four weeks, then escalate to 5mg. Your prescriber may adjust your dose further based on your response and tolerance. Minimum time between dose increases is four weeks.
Ready to take control of your weight loss journey?
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