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 UK Cost Comparison — NHS vs Private
Mounjaro (tirzepatide) costs vary significantly depending on whether you access it through the NHS or private prescription routes in the UK. Understanding the pricing structure, what affects costs at different doses, and your options for accessing this weight loss injection can help you make an informed decision about whether it's right for your situation. This guide breaks down real UK costs and explains the pathway to getting 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.
Mounjaro Pricing in the UK — Private Route
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on the dose you're prescribed. The 2.5 mg starting dose (your first four weeks) is usually the least expensive. As you titrate upwards during your dose escalation phase, costs increase: the 5 mg dose ranges from £150–£200 monthly, while the 10 mg and higher doses (15 mg maximum) can reach £280–£320 per month.
Each KwikPen contains four doses (one month's supply). Many UK private providers offer subscription-based pricing, where you pay monthly, or one-off purchases. Some may offer modest discounts for three or six-month commitments. When comparing private prescription providers, look beyond the medication cost—consider consultation fees (typically £20–£50), whether repeat consultations are included, and delivery costs, which are usually free or modest.
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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 vs Private Access — Pathways and Timescales
NHS route: Mounjaro is available through NICE-approved specialist tier 3 and 4 weight management services, meaning access is free at the point of use. However, accessing NHS Mounjaro requires referral from your GP to a specialist weight management service, and waiting lists vary dramatically by region—some areas have waits exceeding 18 months. Availability also depends on your local Integrated Care Board (ICB) funding decisions.
Private route: You can access tirzepatide privately without NHS referral through an online consultation with a UK-licensed prescriber, often receiving your first prescription within days. This faster access comes at a cost but bypasses waiting lists entirely. Try our free GLP-1 weight loss calculator to explore potential outcomes at different doses, then discuss your options with a private prescriber.
Eligibility criteria are the same for both routes: BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions like type 2 diabetes, hypertension, or obstructive sleep apnoea. South Asian, Chinese, Black African, and Black Caribbean adults may qualify at slightly lower BMI thresholds. Your prescriber—whether NHS or private—will assess your suitability based on your medical history, current medications, and individual health factors.
- 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.
How much does a month's supply of Mounjaro cost in the UK?
Private Mounjaro costs typically range from £129–£320 per month depending on your dose, with starter doses (2.5 mg) at the lower end and maximum doses (15 mg) at the higher end. Additional costs include the online consultation (usually £20–£50) and possible repeat consultation fees. NHS access is free but involves longer waiting times.
What is included in the private prescription cost?
The private prescription cost covers the medication (KwikPen with four weekly doses) and usually includes an online consultation with a UK-licensed prescriber. Some providers include free repeat consultations and delivery. Always check whether follow-up support, repeat consultations, and delivery are included before committing to a provider.
Can I get Mounjaro on the NHS?
Yes, Mounjaro is NICE-approved for use within NHS specialist weight management services. However, you must be referred by your GP to a tier 3 or 4 specialist service. Waiting times vary by region (sometimes 18 months or longer) and availability depends on your local Integrated Care Board's funding decisions.
How do dose increases affect Mounjaro cost?
Mounjaro costs increase as you titrate to higher doses. You start at 2.5 mg (lowest cost), then escalate to 5 mg, 7.5 mg, 10 mg, 12.5 mg, and finally 15 mg. Each dose step takes a minimum of four weeks. Higher doses mean higher monthly costs, so discuss the full titration timeline and cost escalation with your prescriber upfront.
What's the difference between a KwikPen and a standard vial?
Mounjaro is supplied in a pre-filled KwikPen auto-injection device, not a vial. Each pen contains four weekly doses, representing one month's supply. The cost quoted in the UK market always refers to a monthly KwikPen supply. This standardised delivery method makes dosing and storage straightforward for users at home.
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.