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 Prices in the UK
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS specialist services and private prescribing routes. The cost of Mounjaro varies significantly depending on whether you access it through the NHS or privately, and the dose you're prescribed. Understanding UK pricing, eligibility criteria, and the prescribing pathway can help you make an informed decision about whether this 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.
How Much Does Mounjaro Cost in the UK?
The cost of Mounjaro in the UK depends entirely on your access route. NHS prescriptions of Mounjaro carry only the standard prescription charge of £9.90 (or are free if you're eligible for free NHS prescriptions). However, NHS availability is extremely limited — Mounjaro is not routinely prescribed in primary care. Access is through specialist tier 3 or tier 4 weight management services, which have strict eligibility criteria and significant waiting lists in many regions.
Private prescribing costs typically range from £129 to £320 per month, depending on your dose. Each KwikPen contains 4 weeks' supply (4 weekly injections). Pricing varies by provider and dose level: the starting 2.5 mg dose is usually at the lower end, while the maximum 15 mg dose costs more. Some private providers offer discounts for upfront payment of multiple months.
- NHS: £9.90 per prescription (if available through specialist services)
- Private: approximately £129–£320 per month depending on dose
- Total first-year private cost: roughly £1,548–£3,840
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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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS Eligibility and Access Pathways
To access Mounjaro through the NHS, you must meet strict eligibility criteria and be referred to a specialist weight management service (tier 3). You must have a BMI of 30 or above, or BMI of 27–29.9 with at least one weight-related health condition such as type 2 diabetes, high blood pressure, or sleep apnoea. South Asian, Chinese, Black African, and Black Caribbean adults may be eligible at lower BMI thresholds (from 27.5).
Once referred, you'll wait to be assessed by a multidisciplinary team including dietitians, psychologists, and doctors. Waiting times vary dramatically by region — some areas have waiting lists of 6–12 months or longer. Use our free BMI calculator above to check if you might meet the initial eligibility threshold. Your GP can discuss referral options and explain what to expect in your area.
The NHS currently approves Mounjaro (tirzepatide) for weight management through NICE guidance, but availability remains patchy. Many NHS regions have not yet integrated it into their tier 3 services, or have extremely limited capacity. Private prescribing offers faster access — you can be assessed and receive a prescription within days through a GPhC-registered online pharmacy. Private costs are higher but delivery is quicker.
Many people use a hybrid approach: they register with a private prescriber initially while waiting for NHS assessment, then transition to NHS prescribing once they reach the top of the waiting list. This ensures continuous treatment. Both routes require a full clinical assessment to confirm you're medically suitable before a prescription is issued.
- 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 covered by the NHS?
Yes, NICE has approved tirzepatide (Mounjaro) for weight management in the UK. However, NHS availability is limited to specialist tier 3 and tier 4 weight management services. Your GP can refer you, but waiting lists are lengthy in many regions. Once prescribed through the NHS, you pay only the standard prescription charge of £9.90 per prescription, regardless of dose.
How much does a Mounjaro injection cost privately?
Private Mounjaro costs typically range from £129 to £320 per month, depending on your dose. Each KwikPen contains 4 weekly injections. Starting doses (2.5–5 mg) are usually cheaper than maximum doses (15 mg). Over a year, private costs can range from approximately £1,500 to £3,800. Some providers offer discounts for upfront payment of multiple months.
What affects the price of Mounjaro in the UK?
The main cost factors are: your dose level (higher doses cost more), your prescribing route (NHS vs private), and the private provider (prices vary). Some online pharmacies offer price matching or bundled discounts. Your clinical assessment may also determine which dose you start at, which influences overall cost.
How long are NHS waiting lists for Mounjaro?
NHS waiting times for weight management services vary significantly by region, from 3–6 months in some areas to over 12 months in others. You can ask your GP what the current waiting time is in your ICB (Integrated Care Board). Private prescribing has no waiting list — assessment and prescription are usually completed within 1–2 working days.
Is private Mounjaro more expensive than NHS?
Yes — private prescribing costs significantly more (£129–£320/month) compared to the standard £9.90 NHS prescription charge. However, private access is immediate and doesn't require a lengthy waiting list. Some people choose private initially to start treatment quickly, then switch to NHS once their waiting list spot arrives, then transition back to private if they prefer convenience.
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.