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 Is Mounjaro Going Up in the UK?
Mounjaro (tirzepatide) costs in the UK have increased over the past year, affecting both NHS and private access. Whether you're exploring private prescription options or waiting for NHS specialist services, understanding current pricing and what drives costs is essential. This guide covers actual UK pricing trends, eligibility for NHS treatment, private prescription routes, and what to expect when budgeting for weight management support.
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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 — What You'll Pay
Mounjaro pricing in the UK varies significantly between NHS and private prescriptions. Private prescription costs typically range from £129 to £320 per month, depending on your dose and the prescribing service. Doses progress from 2.5mg (starting dose) through to 15mg (maximum), with higher doses costing more. A standard four-week supply of one KwikPen (containing four weekly injections) costs approximately £180–£250 in private online consultations, though this varies by provider.
- 2.5mg–5mg doses: approximately £129–£180 per month
- 7.5mg–10mg doses: approximately £180–£240 per month
- 12.5mg–15mg doses: approximately £240–£320 per month
Costs have risen due to increased demand, supply chain pressures, and tirzepatide's dual GIP/GLP-1 mechanism making it more expensive to manufacture than single-action alternatives like Wegovy (semaglutide). NHS prescriptions through specialist weight management services are free if you're eligible, though accessing NHS routes involves significant waiting times in many regions.
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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 — Which Route Is Right for You?
NHS route: Completely free if prescribed through a tier 3 or tier 4 specialist weight management service, but availability is limited and waiting lists can extend 6–18 months depending on your region. Eligibility requires referral from your GP and assessment by a specialist team. Private route: Available without NHS referral via online consultation with a UK-licensed prescriber. You pay for each prescription upfront, but access is immediate (typically within days). Private prescribing is regulated by the General Pharmaceutical Council (GPhC) — ensure any service is GPhC-registered. Before starting Mounjaro privately, you'll complete an online health assessment to confirm suitability. Use our free BMI calculator and GLP-1 weight loss calculator above to understand your starting point and projected outcomes before consultation.
- 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.
Why has Mounjaro become more expensive in the UK?
Demand for tirzepatide has surged globally, increasing manufacturing and supply costs. As a dual GIP/GLP-1 receptor agonist, it's more complex to produce than single-mechanism alternatives. NHS pressures and rising pharmacy procurement costs have also contributed to price increases across prescription weight loss medications.
Is Mounjaro available on the NHS?
Yes, Mounjaro has been approved by NICE for NHS use in specialist weight management services (tier 3 and 4). However, availability varies significantly by region and waiting lists are often very long. Access is free once prescribed, but the process requires GP referral and specialist assessment.
How much does a private Mounjaro prescription cost per dose?
Private prescription costs typically range from £32–£80 per weekly injection depending on your dose, or £129–£320 per month for a full four-week supply. Higher doses cost more. Prices vary slightly between prescribing services, so comparing options is worthwhile.
Can I switch from Wegovy to Mounjaro and does it cost more?
Yes, you can switch between Mounjaro and Wegovy with prescriber guidance. Mounjaro typically costs more than Wegovy at equivalent doses because tirzepatide is a dual-action medication. Your prescriber will advise on dosing equivalence and cost implications of switching.
What's included in the private prescription cost?
Private prescription costs cover the medication (KwikPen) and the clinical assessment. Storage guidance and patient support materials are usually included. However, ongoing GP monitoring (if you choose to involve your NHS GP) may incur separate fees — discuss this with your GP first.
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.