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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How Much Does Munjaro Cost in the UK?
Munjaro (tirzepatide) costs vary significantly depending on whether you access it through the NHS or through private online prescribing in the UK. On the NHS, the medication itself is free once prescribed through a specialist weight management service, though there may be prescription fees. Privately, costs typically range from £150 to £300 per month depending on your dose and the prescribing provider. This guide explains current UK pricing, what affects cost, and how to access this weekly weight loss injection affordably.
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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.
NHS vs Private Munjaro Costs in the UK
NHS Access (Free Medication): If prescribed through an NHS tier 3 specialist weight management service, Munjaro is provided free on the NHS — you only pay the standard prescription charge (£9.90 in England as of 2024) or nothing if you're exempt. However, NHS availability is extremely limited; waiting lists can be 12–24 months in many regions, and not all ICBs (Integrated Care Boards) offer tirzepatide yet.
Private Access (£150–£300/month): Through GPhC-registered online prescribing services, Munjaro costs range from approximately £150 per month at lower doses to £280–£300 at the maximum 15mg dose. Each KwikPen contains four weekly injections, so monthly cost depends on your maintenance dose. Private prescriptions require an online clinical assessment by a UK-licensed prescriber, typically costing £10–£40.
What affects private cost: Dose level, prescriber provider, whether you purchase single pens or multi-month packs (some offer discounts), and your current health conditions.
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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.
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Mounjaro vs Wegovy Pricing Comparison
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are GLP-1 receptor agonist-based weight loss injections available privately in the UK at similar price points — typically £150–£300 per month. Mounjaro is a dual GIP and GLP-1 receptor agonist, whilst Wegovy is a GLP-1 agonist only. Clinical trials show Mounjaro achieved average weight loss of approximately 15–21% body weight, whilst Wegovy achieved around 15% — though individual results vary. Cost alone should not determine choice; your prescriber will assess which medication is most suitable based on your health profile, existing conditions, and how you tolerate the medication. Try our GLP-1 weight loss calculator to estimate potential outcomes with either 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.
Does the NHS prescribe Mounjaro for weight loss?
Yes, but access is limited. NICE approved tirzepatide for NHS use through specialist tier 3 weight management services. However, availability varies significantly by region — many ICBs have waiting lists of 12–24 months or do not yet offer it. Ask your GP about NHS referral to a specialist service in your area; if waiting lists are very long, private prescribing may be faster.
What's included in the monthly private cost of Munjaro?
Private costs (£150–£300/month) cover the Munjaro KwikPen prescription only. You may also need to pay a separate online consultation fee (£10–£40) during your initial assessment. Some providers offer multi-month discounts. Always confirm the total cost including consultation fees before starting.
Why does Munjaro cost more at higher doses?
Munjaro is dosed from 2.5mg up to 15mg weekly. Higher doses contain more active ingredient (tirzepatide) per pen, so they cost more. A 15mg dose typically costs around £280–£300 monthly, whilst a 5mg dose costs approximately £150–£180. You start at 2.5mg and increase gradually, so initial costs are lower.
Is Munjaro more expensive than Wegovy in the UK?
Private pricing is very similar — both typically range from £150–£300 per month depending on dose. Wegovy maxes out at 2.4mg (lower than Mounjaro's 15mg ceiling), so maximum monthly costs are roughly equivalent. Your GP or prescriber can discuss which offers better value for your specific situation.
Can I get Munjaro cheaper if I pay for multiple months upfront?
Some private prescribing services offer discounts for purchasing multiple pens or multi-month supplies upfront — discounts vary from 5–15%. Check with your chosen provider. NHS prescriptions have no upfront discount; you pay the standard prescription charge per item regardless of quantity.
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.