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 Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is a prescription-only once-weekly weight loss injection available in the UK through both NHS specialist services and private online prescribing. The cost varies significantly depending on whether you access it through the NHS or privately, your dose, and your provider. Understanding pricing and availability can help you make an informed decision about whether this GIP receptor agonist medication is right for you.
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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.
Mounjaro Pricing Across UK Routes
NHS access: Through specialist tier 3 weight management services, Mounjaro is available at no charge at the point of use (standard NHS prescription charge applies if applicable — currently £11.90 per item in England). However, NHS availability varies significantly by region and integrated care board (ICB). Many areas have waiting lists of months or years, and access is typically restricted to people with a BMI of 30 or above, or 27+ with weight-related health conditions like type 2 diabetes or cardiovascular disease.
Private prescribing: Through GPhC-registered online pharmacies, Mounjaro typically costs between £129 and £320 per month depending on dose. A single KwikPen (4 doses, 4 weeks supply) at 2.5 mg starting dose may cost around £129–£180, while the 15 mg maintenance dose can range from £250–£320. Prices vary between providers. Private access does not require NHS referral but does require a clinical assessment from a UK-licensed prescriber.
- Starting doses (2.5 mg–5 mg): approximately £129–£200/month
- Mid-range doses (7.5 mg–10 mg): approximately £180–£250/month
- Maintenance doses (12.5 mg–15 mg): approximately £250–£320/month
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.
Access Routes & What Affects Your Cost
Your Mounjaro cost depends on your access route and dose escalation. If prescribed privately, you'll typically start at 2.5 mg and increase by 2.5 mg every four weeks, meaning your monthly cost will rise as you escalate. Many people remain on a mid-range maintenance dose (10 mg) rather than the maximum 15 mg, which can reduce ongoing costs. NHS access removes cost but involves waiting times and regional restrictions. Some private providers offer subscription models or bundle pricing for longer courses. Always confirm exact pricing with your prescriber or pharmacist before starting, as costs can change and may vary by provider location within the UK.
- 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.
Can I get Mounjaro free on the NHS?
Yes, Mounjaro is available on the NHS through specialist tier 3 weight management services at no cost (except the standard £11.90 prescription charge in England, or free if eligible). However, access is limited by region, availability, and eligibility criteria (BMI 30+ or 27+ with health conditions). Waiting lists can be long.
Is Mounjaro cheaper than Wegovy?
Pricing is broadly similar between Mounjaro and Wegovy in private prescribing (typically £129–£320/month depending on dose). Mounjaro's dual GIP receptor agonist mechanism may offer different results than Wegovy's single GLP-1 mechanism, but cost alone shouldn't determine choice — prescriber assessment of your individual health is more important.
What's included in the Mounjaro price?
The price is for the KwikPen device containing four weekly doses (one month supply). It does not include prescriber consultation fees (if paying separately) or storage costs. Some private providers bundle consultation into the price; others charge separately. Check with your provider for the full breakdown.
Do I have to pay prescription charge on NHS Mounjaro?
In England, you pay the standard prescription charge (£11.90 per item, or free if exempt — under 18, over 60, pregnant, low income, or certain medical conditions). Scotland, Wales, and Northern Ireland have different prescription charge policies. Check your local arrangements.
Does Mounjaro price change as I increase my dose?
Yes, typically you pay per dose per month. As you escalate from 2.5 mg to 15 mg over 16–20 weeks, your monthly cost rises proportionally. Once you reach your maintenance dose, the cost stabilises. Discuss dose escalation costs with your prescriber or pharmacist before starting.
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.