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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Best Mounjaro Deals in the UK — What You Need to Know
If you're looking for the best Mounjaro deals in the UK, it's important to understand that pricing and access depend on whether you're pursuing NHS or private routes. Mounjaro (tirzepatide) is a prescription-only weight management injection that may help support weight loss when combined with lifestyle changes. This guide explains current UK pricing, eligibility requirements, and where to find competitive options so you can make an informed decision about accessing this medication.
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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.
NHS vs Private Access to Mounjaro in the UK
NHS access to Mounjaro is provided through specialist tier 3 and tier 4 weight management services. NICE has approved tirzepatide for use within NHS weight management pathways, but access varies significantly by region and local health commissioning. NHS provision is typically free at point of care, but waiting lists can be lengthy — sometimes months or even years depending on your area. You'll need a GP referral to specialist services.
Private access to Mounjaro in the UK is available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. Private pricing typically ranges from £129 to £320 per month depending on your dose — lower doses (2.5–5 mg) are at the lower end, while higher maintenance doses (10–15 mg) cost more. Private access doesn't require NHS referral and is usually faster than NHS waiting lists, though it's a paid service. Always check that the provider is GPhC-registered and the prescriber is UK-licensed before proceeding.
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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.
What Affects Mounjaro Cost and Finding Competitive Pricing
Several factors influence Mounjaro pricing in the UK. Your current dose matters — you'll pay more for higher doses (15 mg costs more than 5 mg). Some private providers offer discounts for purchasing multiple pens in advance or setting up regular subscriptions. The prescriber's clinical assessment fee (typically £10–30) may be charged separately from the medication cost. To find the best deals, compare quotes from several GPhC-registered pharmacies, check whether they offer loyalty discounts or bundle pricing, and verify that costs include the prescription fee. Remember that the cheapest option isn't always best — ensure the provider conducts a thorough clinical assessment to confirm Mounjaro is suitable for you based on your health profile.
- 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.
What's the typical cost of Mounjaro in the UK on the private market?
Private Mounjaro pricing typically ranges from £129 to £320 per month depending on dose. Lower starting doses (2.5–5 mg) cost around £129–£180, while maintenance doses (10–15 mg) range from £220–£320. Prices vary between providers, so it's worth comparing quotes. Always verify the provider is GPhC-registered.
Can I get Mounjaro free on the NHS?
Yes, Mounjaro is available free through NHS specialist weight management services (tier 3/4), as NICE has approved tirzepatide. However, access varies by region and waiting lists can be very long. You need a GP referral to access NHS specialist services in your area.
How do I know if I'm eligible for Mounjaro?
You may be eligible if you have a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions like type 2 diabetes, high blood pressure, or cardiovascular disease. South Asian, Chinese, Black African, or Black Caribbean adults may have lower thresholds. A prescriber will assess your individual eligibility.
Is Mounjaro (tirzepatide) the same as the diabetes injection Ozempic?
No. Both contain different active ingredients. Mounjaro contains tirzepatide (a dual GIP and GLP-1 agonist) and is licensed for weight management. Ozempic contains semaglutide and is licensed for type 2 diabetes — Wegovy is the semaglutide brand licensed for weight management in the UK.
What should I check before buying Mounjaro from a private provider?
Verify the pharmacy is GPhC-registered, the prescriber is UK-licensed, they conduct a proper clinical assessment, and the price includes the prescription fee. Compare costs across providers, check for any subscription or loyalty discounts, and ensure you understand storage requirements (refrigeration for unopened pens).
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.