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 Price in the UK: NHS vs Private Costs
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding the cost difference between NHS and private access is essential. Mounjaro is available through two routes in the UK: NHS specialist tier 3 services and private online prescribing. This guide breaks down current pricing, eligibility requirements, and what you can expect to pay depending on your route to prescription. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses before discussing options with your prescriber.
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Calculate Your BMI Instantly
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.
NHS Access and Costs for Mounjaro in the UK
NHS access to Mounjaro is provided through specialist tier 3 and tier 4 weight management services, not standard GP prescriptions. NICE approved tirzepatide (Mounjaro) for use within NHS weight management services, but availability varies significantly by region and integrated care board (ICB).
NHS costs to patients: When prescribed through the NHS, there is typically no direct medication cost beyond your standard prescription charge (currently £9.90 per item in England if eligible). However, accessing NHS services often involves waiting lists that can extend from several months to over a year in many areas.
- Referral to tier 3 services required from your GP
- Eligibility assessed at specialist clinic
- Free on NHS if approved, subject to prescription charges only
- KwikPen devices supplied by NHS pharmacy
Regional variation means some ICBs may not yet commission Mounjaro, even after NICE approval. Your GP can confirm whether your local service offers this medication.
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.
Private Prescription Costs and How to Access
Private access to Mounjaro is significantly faster than NHS routes. Private prescription prices in the UK typically range from £129 to £320 per month, depending on the dose and prescribing provider.
- Starter dose (2.5 mg): approximately £129–£180/month
- Standard dose (5–10 mg): approximately £180–£260/month
- Higher dose (15 mg): approximately £260–£320/month
Private prescriptions are issued by a UK-licensed prescriber following an online clinical assessment. You'll need to complete a health questionnaire, and the prescriber will assess whether Mounjaro is suitable. Once approved, the prescription is dispensed by a GPhC-registered pharmacy. Unlike NHS routes, there are no waiting lists—prescriptions can often be arranged within days. Use our BMI calculator to confirm your eligibility before booking a 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.
Is Mounjaro cheaper on the NHS or private prescription in the UK?
On the NHS, you pay only the standard prescription charge (£9.90 in England), but face long waiting lists and regional availability issues. Private prescriptions cost £129–£320/month depending on dose but offer immediate access without waiting. For cost-conscious patients, NHS is cheaper if available; for speed, private is faster.
Will my GP refer me to NHS Mounjaro services?
Your GP can refer you to your local tier 3 weight management service, but NICE approval doesn't assures funding in your area. Some ICBs commission tirzepatide; others don't yet. Ask your GP whether your local service offers Mounjaro and what the current waiting time is.
What's included in private Mounjaro prescription prices?
Private pricing typically covers the prescriber's consultation, clinical assessment, and the prescription itself. The price quoted is usually per month or per KwikPen. Check whether it includes follow-up support or if additional consultations cost extra.
How long is the NHS waiting list for Mounjaro?
Waiting times vary dramatically by region—from a few months to 18+ months in some areas. Contact your local tier 3 weight management service for current waiting times, or ask your GP to check eligibility and timescales before referring you.
Can I switch from NHS to private Mounjaro if waiting lists are too long?
Yes. If NHS waiting lists are lengthy, you can pursue private prescription at any time without affecting future NHS access. Some patients use private prescriptions temporarily while awaiting NHS appointment, then continue NHS once available.
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.