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 in the UK?
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through NHS specialist services and private prescribing. The cost varies significantly depending on whether you access it through the NHS or privately. Understanding the pricing structure, what's included, and your eligibility options helps you make informed decisions about this GLP-1 receptor agonist and GIP receptor medication. This guide explains current UK pricing and access routes.
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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 Private Pricing in the UK
Private prescribing costs typically range from £129 to £320 per month, depending on your dose and the provider. Here's what you're likely to pay:
- Starting doses (2.5 mg): approximately £129–£150 per month
- Maintenance doses (5–10 mg): approximately £180–£250 per month
- Maximum dose (15 mg): approximately £280–£320 per month
Each KwikPen contains 4 weekly injections (one month's supply). Private costs include the prescription fee, clinical assessment, and pharmacy dispensing. Some providers offer subscription discounts if you commit to multiple months. Prices vary between GPhC-registered online pharmacies, so it's worth comparing. Private access doesn't require NHS referral and is often faster than NHS routes, though individual results vary with any weight loss medication.
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 Availability
Mounjaro is available through NHS specialist tier 3 weight management services, but access is limited and varies significantly by region. You'll need referral from your GP to a local integrated care board (ICB) specialist service. NHS supply is free once prescribed, but waiting lists can be several months or longer in many areas. NICE has approved tirzepatide (Mounjaro) for use within NHS services for eligible adults. Eligibility requires BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or cardiovascular disease. Lower thresholds apply for South Asian, Chinese, Black African, and Black Caribbean adults. Check your local ICB website or ask your GP about availability in your area.
- 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 Mounjaro on the NHS?
Yes, Mounjaro (tirzepatide) is approved by NICE for NHS use within specialist tier 3 weight management services. However, availability is limited and varies by region. You'll need GP referral and may face waiting lists of several months or longer depending on your local integrated care board.
How much does a Mounjaro pen cost privately?
Private Mounjaro costs range from approximately £129–£320 per month depending on your dose. Starting doses (2.5 mg) are typically £129–£150, while higher doses (10–15 mg) cost £250–£320. Each pen contains four weekly injections. Prices vary between GPhC-registered online pharmacies.
What does the Mounjaro price include?
Private prices typically include the Mounjaro KwikPen, the online clinical assessment with a UK-licensed prescriber, and pharmacy dispensing fees. Some providers offer support or follow-up consultations included in the price. Always check what's included before purchasing from any provider.
Are there cheaper alternatives to Mounjaro?
Wegovy (semaglutide) is another weekly weight loss injection with similar effectiveness, though it uses a different mechanism (GLP-1 only versus Mounjaro's dual GIP and GLP-1 action). Saxenda (liraglutide) is a daily injection. Costs vary between providers. Consult a prescriber to determine which is most appropriate for your health.
Can I get a discount on Mounjaro?
Some private providers offer multi-month subscription discounts or loyalty pricing. Compare costs across GPhC-registered pharmacies before purchasing. NHS supply is free, but eligibility and waiting times vary by region. Always check with your local ICB or GP about NHS access first.
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.