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 2.5mg Cost in the UK?
The price of Mounjaro 2.5mg in the UK varies significantly depending on whether you access it through the NHS or a private prescription. The 2.5mg dose is the starter dose in the Mounjaro titration schedule, used during the first 4 weeks of treatment. Private costs typically range from £129 to £180 per pen, though NHS access is generally free for eligible patients referred through specialist weight management services. This guide explains current UK pricing, access routes, and what affects the cost of tirzepatide treatment.
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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.
UK Mounjaro 2.5mg Pricing and Access Routes
Private prescription pricing: A single Mounjaro 2.5mg KwikPen (containing 4 weekly doses) typically costs between £129 and £180 when prescribed privately through a UK-licensed prescriber and dispensed by a GPhC-registered pharmacy. Prices vary by provider and may increase with higher doses as you progress through the titration schedule.
NHS access: If prescribed through an NHS specialist tier 3 or tier 4 weight management service, Mounjaro is free on the NHS for eligible patients. However, NHS availability is extremely limited in many regions, and waiting lists can extend to several months or years. NICE approved tirzepatide (the active ingredient in Mounjaro) for use within NHS specialist services, but access depends on regional ICB funding and commissioning decisions.
What you're paying for: Each Mounjaro KwikPen contains 4 pre-filled doses — one dose per week. At 2.5mg, you'll use one pen over 4 weeks, then progress to the 5mg dose in week 5 (requiring a new prescription). Total treatment cost increases as you titrate to higher maintenance doses.
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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.
Factors That Affect Your Mounjaro Cost
Several factors influence what you'll pay for Mounjaro in the UK. Private provider fees vary: online clinics and weight loss programmes charge different consultation and prescription fees on top of pharmacy costs. Dose progression: your total monthly cost will increase as you move from 2.5mg to 5mg, then 7.5mg, 10mg, 12.5mg, and finally 15mg (maximum dose). Treatment duration: most people require ongoing treatment, so annual costs should be considered. Combined costs: some private providers bundle the prescriber consultation, prescription fee, and pharmacy supply into one price, whilst others charge separately. Always ask for a total cost breakdown before starting treatment. Using our free GLP-1 weight loss calculator can help you understand potential outcomes at different doses.
- 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 2.5mg available on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is available on the NHS for eligible adults through specialist tier 3 or tier 4 weight management services. Eligibility requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions. However, NHS access is extremely limited, with long waiting lists in most regions. Your GP can refer you to your local specialist service.
How much more expensive is Mounjaro than Wegovy?
Mounjaro and Wegovy (semaglutide) are typically priced similarly in the private market, ranging from £129–£200 per pen, though exact costs vary by provider. Mounjaro requires fewer injections per year (52 per year) compared to Wegovy's weekly injections. Total annual costs are comparable, but individual pricing depends on your chosen provider and the dose you're taking.
Do I need to pay for blood tests or consultations separately?
Yes, most private providers charge separately for the initial GP consultation (typically £15–£50), any required blood tests (£30–£100), and ongoing follow-up appointments. Some online clinics bundle these costs. Always ask what's included in the quoted price before proceeding with a prescription.
Can I get Mounjaro 2.5mg prescribed by my GP?
Standard GP prescribing of Mounjaro for weight management is very rare in the UK. Your GP can refer you to a specialist weight management service (NHS route) or you can access private prescriptions through online clinics. Specialist services, not primary care GPs, handle Mounjaro prescribing within both NHS and private sectors.
What's included in the price of a Mounjaro KwikPen?
One Mounjaro KwikPen contains 4 pre-filled doses (one per week). At 2.5mg, it covers your first 4 weeks of treatment. The price quoted by pharmacies includes the pen, needles, and packaging. You'll need a new pen every 4 weeks as you progress through the titration schedule to higher 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.