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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Mounjaro Weight Loss Injection: UK Cost and Access
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS specialist services and private prescribing. If you're searching for discounts or cost information, it's important to understand how UK pricing works, what eligibility looks like, and where to access this medication safely. This guide covers everything you need to know about obtaining Mounjaro in the UK and managing the costs involved.
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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.
How Much Does Mounjaro Cost in the UK?
Mounjaro pricing in the UK varies significantly between NHS and private access. NHS access is free at point of use through specialist weight management services (tier 3), though you may face waiting lists of several months depending on your region. Private prescribing through GPhC-registered online pharmacies typically costs between £129 and £320 per month, depending on your dose and the provider.
Each KwikPen device contains four weekly doses (one month's supply). Starting doses (2.5 mg) are usually at the lower end of the price range, while higher maintenance doses (10–15 mg) cost more. Some private providers offer discounts for upfront payment of multiple months' supply, though genuine "discount codes" or heavily discounted pricing should be approached cautiously — always verify that any provider is GPhC-registered and employs a UK-licensed prescriber.
- NHS: free (but requires specialist referral and may involve waiting lists)
- Private: £129–£320 per month depending on dose
- Costs may vary between providers — compare before committing
- Prescription required regardless of access route
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.
Getting Mounjaro Through the NHS vs Private Access
NHS route: You'll need a referral from your GP to a specialist weight management service (tier 3 or 4). NICE has approved tirzepatide (Mounjaro) for NHS use, but availability and waiting times vary dramatically by region (Integrated Care Board). In some areas, access is relatively quick; in others, waiting lists exceed six months. You must meet eligibility criteria: BMI 30 or above (or 27–29.9 with weight-related health conditions).
Private route: You can access Mounjaro through an online consultation with a UK-licensed prescriber without an NHS referral. If clinically appropriate, the prescriber issues a prescription and a GPhC-registered pharmacy dispenses your medication. This route is faster but requires private payment. Use our free GLP-1 weight loss calculator to estimate potential results at different doses before committing to any treatment.
Eligibility for Mounjaro applies to both NHS and private access. You must be an adult (18+) with a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with at least one weight-related health condition (type 2 diabetes, prediabetes, high blood pressure, sleep apnoea, or cardiovascular disease). Certain groups—South Asian, Chinese, Black African, and Black Caribbean adults—may be eligible at lower BMI thresholds due to higher health risks. You cannot take Mounjaro if you're pregnant, breastfeeding, or have a history of thyroid cancer or multiple endocrine neoplasia (MEN2). Always use the BMI calculator on this page to check your starting point before seeking a prescription.
- 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 there a Mounjaro discount or voucher available in the UK?
There are no official Mounjaro discounts or vouchers from the manufacturer (Eli Lilly) in the UK. Private providers may offer loyalty discounts or multi-month payment reductions, but always verify the provider is GPhC-registered. NHS access is free at point of use, making it the lowest-cost option if you meet eligibility criteria and can access your local specialist service.
How much does a single Mounjaro KwikPen cost?
A single KwikPen contains four doses (one month supply) and typically costs £129–£320 privately, depending on the dose strength (2.5 mg to 15 mg). Starting doses are cheaper than maximum doses. NHS dispensing is free, but requires a specialist prescription through the NHS weight management pathway.
Can I get Mounjaro cheaper through the NHS?
Yes—NHS provision is completely free, but access requires referral to a specialist tier 3 weight management service and you must meet eligibility criteria. Waiting times vary by region (ICB). Some areas offer faster access than others. Ask your GP about your local specialist service and typical waiting times.
What's the difference between Mounjaro cost on the NHS vs private prescription?
NHS: completely free after referral and assessment. Private: £129–£320/month depending on dose. NHS has longer waiting times (months); private is faster (days to weeks). Both routes require a valid UK prescription from a licensed prescriber. Neither route involves "discounts"—pricing is set by the pharmacy or NHS commissioning.
Is Mounjaro covered by private health insurance in the UK?
Coverage varies by policy and insurer. Some private health insurance policies cover weight management injections; others exclude them or classify them as cosmetic. Contact your private health insurer directly to check your specific policy. NHS provision is always available to eligible adults regardless of insurance status.
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.