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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What's the Best Price for Mounjaro in the UK?
Mounjaro (tirzepatide) is a prescription-only weight loss injection available in the UK through both NHS specialist services and private prescribers. The cost of Mounjaro varies significantly depending on whether you access it through the NHS or privately, and your specific dose. Private pricing typically ranges from £129 to £320 per month, whilst NHS access is free but depends on your local specialist weight management service. Understanding your options, eligibility, and what influences pricing will help you make an informed decision about accessing this medication.
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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 Mounjaro Cost Privately in the UK?
Private Mounjaro pricing in the UK ranges from approximately £129 to £320 per month, depending on your dose level and the prescriber. The cost structure typically works like this: lower starting doses (2.5 mg and 5 mg) cost less, whilst higher maintenance doses (10 mg and 15 mg) cost more. A standard Mounjaro KwikPen contains four weekly injections, so monthly costs reflect a full month's supply. Some private providers offer tiered pricing — you may pay less if you commit to a longer treatment course, or more if purchasing individual months. It's worth noting that prices can vary between different GPhC-registered online pharmacies, so comparing options is sensible. The dose you're prescribed will depend on your clinical assessment, not your budget — your prescriber will recommend the dose most likely to be effective for you based on your health profile.
- Starting doses (2.5–5 mg): typically £129–£180/month
- Mid-range doses (7.5–10 mg): typically £180–£250/month
- Highest doses (12.5–15 mg): typically £250–£320/month
- Prices may vary between different providers
- Your prescribed dose is based on clinical need, not cost
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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.
NHS vs Private Access — What's the Difference?
NHS access is free at the point of use but requires a referral to your local tier 3 specialist weight management service. Waiting times vary significantly by region — some areas have waiting lists of several months or longer. Your GP will refer you if you meet eligibility criteria (BMI ≥30, or BMI ≥27 with weight-related health conditions). Private access is faster — you complete an online consultation with a UK-licensed prescriber, and if approved, your prescription is dispensed by a GPhC-registered pharmacy within days. Private treatment costs money but avoids NHS waiting lists. Both routes require a clinical assessment; the main difference is speed of access and cost. Some people pursue private treatment because NHS waiting times are too long for their circumstances. Your GP can discuss which route is most appropriate for you.
- 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.
What's included in the monthly cost of Mounjaro?
The monthly cost covers a four-week supply of Mounjaro in a pre-filled KwikPen (four weekly injections at your prescribed dose). It includes the medication only — not consultations, GP letters, or ongoing support, though some private providers bundle these. Storage and disposal are your responsibility.
Why does Mounjaro cost more at higher doses?
Higher doses contain more active medication (tirzepatide) per injection. A 15 mg dose contains more tirzepatide than a 5 mg dose, so the manufacturing and supply costs are higher. Your prescriber will recommend the dose most likely to be effective for your individual health profile.
Is Mounjaro cheaper on the NHS?
Yes — Mounjaro is free on the NHS if prescribed through a specialist weight management service. However, NHS access requires a referral from your GP and can involve significant waiting times depending on your region. Private access is faster but costs money. Both routes require a clinical assessment.
Can I get Mounjaro without a prescription in the UK?
No. Mounjaro is prescription-only in the UK — you cannot buy it without a valid prescription from a UK-licensed prescriber. Private prescribers are available online following a clinical consultation, but a prescription is always required before dispensing.
Does the price of Mounjaro include ongoing GP support?
Private pricing typically covers the medication only. Some providers offer bundled consultations or GP letters, but this varies. NHS treatment includes ongoing support from your specialist weight management team. Check with your chosen provider what's included in their quoted price.
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.