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
Free tracker included with every download this week
How Much Does Mounjaro Cost Per Month in the UK?
Mounjaro (tirzepatide) costs differ significantly depending on whether you access it through the NHS or privately. On the NHS, Mounjaro is free if prescribed through a specialist weight management service, though access varies widely by region and waiting lists can be lengthy. Through private prescription, monthly costs typically range from £129 to £320 depending on your dose and the provider. Understanding these costs, alongside factors like your BMI and eligibility, helps you plan your weight management journey effectively.
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Calculate Your BMI Instantly
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.
Private Mounjaro Costs in the UK
Private Mounjaro (tirzepatide) pricing in the UK typically varies based on dose and prescribing provider:
- 2.5 mg dose: approximately £129–£150 per month
- 5 mg dose: approximately £149–£180 per month
- 10 mg dose: approximately £199–£250 per month
- 15 mg dose (maximum): approximately £270–£320 per month
Private prescriptions come from UK-licensed GPhC-registered pharmacies following an online clinical assessment. Costs include the Mounjaro KwikPen (4 weekly doses) plus the prescribing consultation. Some providers offer monthly subscription models which may reduce per-dose costs. Always confirm whether the quoted price includes the clinical assessment fee before proceeding. Prices vary between providers, so comparing options is worthwhile if accessing privately.
Clinically BackedWeight Loss
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 Access and Regional Variation
NHS Mounjaro is free if prescribed through a specialist tier 3 or tier 4 weight management service. However, availability is highly variable across England, Scotland, Wales, and Northern Ireland. Some regions offer rapid access to Mounjaro, whilst others have waiting lists of many months or do not currently stock it due to funding constraints. Access through the NHS typically requires referral from your GP to a specialist weight management service, which itself can involve waiting. Check with your local Integrated Care Board (ICB) or health board to understand current availability and waiting times in your area. Using our free BMI calculator above can help you assess whether you meet the typical eligibility criteria (BMI 30+ or BMI 27+ with weight-related 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.
Does the NHS prescribe Mounjaro for weight loss?
Yes, NICE has approved tirzepatide (Mounjaro) for use in NHS specialist weight management services for eligible adults. However, regional availability is inconsistent. You'll need referral from your GP to a tier 3 specialist service. Check with your local health board about current availability and waiting times, as some areas have limited access or long waiting lists.
Can I get Mounjaro prescribed privately without NHS referral?
Yes. You can access Mounjaro privately through online prescribing services. A UK-licensed prescriber will conduct a clinical assessment, and if appropriate, issue a prescription to be dispensed by a GPhC-registered pharmacy. This avoids NHS waiting lists but requires private payment, typically £129–£320 per month depending on dose.
What is included in the monthly Mounjaro cost?
The quoted price typically includes the Mounjaro KwikPen (which contains 4 weekly doses) and the prescribing consultation. Some private providers charge these separately, whilst others bundle them. Always clarify what's included before purchasing. Compare providers, as costs and service quality vary.
How does Mounjaro cost compare to Wegovy in the UK?
Mounjaro and Wegovy have similar private prescription costs (roughly £129–£320/month depending on dose). Wegovy is a GLP-1 agonist with a maximum dose of 2.4 mg, whilst Mounjaro is a dual GIP/GLP-1 agonist with a maximum dose of 15 mg. Your prescriber will assess which is more suitable. Both are free on the NHS if accessed through specialist services.
What should I budget for if using Mounjaro privately?
Budget £129–£320 per month depending on your dose, plus any initial consultation fee. If titrating up from a starting dose (2.5 mg) towards maximum (15 mg), your monthly cost will increase over 4–5 months as you progress through doses. Factor in the cost of lifestyle changes (healthier food, activity) alongside medication. Use our GLP-1 weight loss calculator above to explore projected outcomes at different doses.
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.