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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How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through both NHS specialist services and private prescription routes. Costs vary significantly depending on whether you access it through the NHS or privately. Understanding your options, eligibility criteria, and what to expect will help you make an informed decision about this medication. This guide covers UK pricing, access routes, and the clinical assessment process you'll need to complete.
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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.
Mounjaro Cost in the UK — Private vs NHS Access
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on the dose and provider. The KwikPen contains four weeks' supply of injections, so monthly costs align with your prescription cycle.
Dose-dependent pricing: Starting doses (2.5 mg) are generally cheaper than maximum doses (15 mg). Most private providers charge on a sliding scale based on which dose you've been titrated to. You'll also need to factor in the cost of the initial online clinical assessment, which typically costs £50–£150.
NHS route: If prescribed through NHS specialist weight management services, Mounjaro is provided free at point of use (subject to NHS England prescription charges — currently £9.90 per item in England, though some patients qualify for exemptions). However, NHS access involves referral to tier 3 services, potential waiting lists of several months to years depending on your region, and limited availability across different Integrated Care Boards (ICBs). Access varies significantly by postcode.
- Private: faster access, no waiting list, but you pay the full cost
- NHS: free medication but longer wait times and regional variation in availability
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 in the UK — The Online Prescription Route
To access Mounjaro privately in the UK, you'll complete an online consultation with a UK-licensed prescriber. This typically involves an online questionnaire covering your medical history, current medications, BMI, and weight-related health conditions. The prescriber will assess your eligibility based on NICE guidance (BMI 30+ or BMI 27–29.9 with weight-related comorbidities). You can use our free GLP-1 weight loss calculator to check your approximate BMI and understand what dose progression might look like.
If approved, your prescription is issued to a GPhC-registered pharmacy, who will dispense and deliver your KwikPen pens. The entire process typically takes 3–7 working days from initial consultation to delivery. You'll receive detailed injection guidance and support. Remember that dose titration starts at 2.5 mg and increases over 16–20 weeks, so costs may vary as your dose increases.
- 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 available on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is approved by NICE for NHS use through specialist tier 3 weight management services. However, availability is limited and varies significantly by region. You'll need a GP referral and may face substantial waiting lists. Private prescription is faster but costs £129–£320 monthly depending on dose.
What's the difference between Mounjaro and Wegovy in terms of cost?
Mounjaro (tirzepatide) typically costs £129–£320/month privately, while Wegovy (semaglutide) generally costs £120–£250/month. Costs vary by provider and dose. Mounjaro is a dual GIP+GLP-1 agonist with a higher maximum dose (15 mg), whereas Wegovy is a GLP-1 agonist alone (2.4 mg maximum). Both require prescription and clinical assessment.
Do I need to pay for clinical assessments when getting Mounjaro privately?
Yes, most private providers charge £50–£150 for the initial online clinical assessment with a UK-licensed prescriber. This is separate from the cost of the medication itself. Some providers may include this in their first prescription cost. Always check what's included before proceeding with your consultation.
Can I get Mounjaro cheaper than the advertised private prices?
Prices vary between different GPhC-registered pharmacies and providers. Some may offer slight discounts for bulk ordering (3–6 month supplies) or loyalty schemes, though this is less common in the UK market. Always ensure you're using a legitimate UK-licensed prescriber and GPhC-registered pharmacy. Never purchase from unregistered sources.
How long does dose titration take, and does the cost increase?
Mounjaro titration takes 16–20 weeks, starting at 2.5 mg and increasing every 4 weeks. Your cost will increase as your dose increases — a 2.5 mg dose costs less than 15 mg. Budget for progressive cost increases during your first 5 months, then a stable monthly cost once you reach your maintenance dose. Use our GLP-1 weight loss calculator to estimate potential outcomes at different doses.
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.