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 Prices in the UK — Where to Access & What It Costs
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes, with significant cost and access differences between them. If you're considering Mounjaro as a weight loss treatment, understanding the pricing structure and how to access it safely is essential. This guide explains current UK costs, the two main access routes, and what to expect when seeking a prescription.
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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.
Private Mounjaro Costs in the UK
Private prescription costs for Mounjaro vary depending on dose and provider, typically ranging from £129 to £320 per month. Most private online prescribing services in the UK offer tirzepatide at various doses, with pricing structured around the KwikPen delivery method (each pen contains 4 weekly doses). Starting doses like 2.5 mg are often at the lower end of the price range, whilst higher maintenance doses such as 15 mg cost more. It's important to note that private prescription costs cover the medication only — consultations may be charged separately, though many UK-registered online services include an initial assessment within their package. Prices can vary between providers, so comparing services is worthwhile. Our GLP-1 weight loss calculator can help you estimate potential outcomes at different doses, which may inform your decision when comparing cost versus expected results.
- Starting dose (2.5 mg): typically £129–£160 per month
- Maintenance doses (5–10 mg): typically £180–£240 per month
- Higher doses (12.5–15 mg): typically £260–£320 per month
- Prices are for the medication only; consultation fees vary by provider
- Each KwikPen contains 4 weekly doses (one month's supply)
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 vs Private Access Routes
NHS access to Mounjaro is available through specialist tier 3 weight management services but involves longer waiting times and regional variation. NICE has approved tirzepatide for NHS use, but access is restricted to specialist multidisciplinary services — your GP cannot prescribe it in primary care. You'll need a referral, followed by assessment, and placement on a waiting list, which can take many months in some areas. Private prescription routes through GPhC-registered online services are faster: you complete an online consultation with a UK-licensed prescriber, receive a prescription within days if approved, and the medication is dispensed by a registered pharmacy. Private access doesn't require NHS referral or waiting lists. Choose based on your timeline, budget, and preference for NHS versus independent prescriber oversight. Use our BMI calculator to confirm your eligibility and understand your starting point for any treatment discussion.
- 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 does a Mounjaro KwikPen cost in the UK?
A single KwikPen containing one month's supply (4 weekly doses) costs between £129–£320 depending on the dose strength and provider. Lower doses like 2.5 mg start around £129–£160, whilst the maximum 15 mg dose costs approximately £260–£320. Prices vary between private prescribing services, so it's worth comparing options.
Is Mounjaro available on the NHS in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use, but access is only through specialist tier 3 weight management services. Your GP cannot prescribe it in primary care. You'll need referral to a specialist service and may face significant waiting lists depending on your region.
How do I get a private Mounjaro prescription in the UK?
You complete an online consultation with a UK-licensed prescriber through a GPhC-registered service. The prescriber assesses your eligibility based on your BMI and health history. If approved, you receive a prescription, and the medication is dispensed by a registered pharmacy within days. No NHS referral is needed.
What's the difference between NHS and private Mounjaro access?
NHS access is free but involves waiting lists (sometimes months or years) and is limited to specialist services. Private access is faster (days to weeks), doesn't require NHS referral, but costs £129–£320 per month per dose. Choose based on your timeline and budget.
Does Mounjaro cost the same across all UK online pharmacies?
No, prices vary between GPhC-registered services and providers. Starting doses are typically cheaper than higher maintenance doses. Compare providers before committing, and check whether the quoted price includes the consultation or if there are additional fees for repeat prescriptions.
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.