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) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. NHS availability is limited and accessed through specialist tier 3 weight management services, while private prescriptions cost between £129 and £320 per month depending on your dose. Understanding both routes, eligibility criteria, and what your costs cover will help you make an informed decision about this prescription-only weight loss injection.
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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 Eligibility for Mounjaro
NHS access to Mounjaro is limited and regional. NICE has approved tirzepatide for use within specialist weight management services, but availability varies significantly by region (Integrated Care Board). Most people access Mounjaro through tier 3 specialist services after referral from their GP — not through standard primary care prescribing.
NHS eligibility requires:
- BMI of 30 kg/m² or above, or BMI 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, dyslipidaemia, sleep apnoea)
- Lower thresholds for South Asian, Chinese, Black African, or Black Caribbean adults (BMI 27.5+)
- Referral to a tier 3 weight management service
- Assessment and prescription through that specialist service
On the NHS, Mounjaro is provided free at the point of use, but waiting lists for specialist services can be very long in many regions — sometimes 12–24 months or longer. Your GP can advise on local availability and waiting times.
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 Mounjaro Pricing in the UK
Private Mounjaro costs approximately £129–£320 per month, depending on your dose and provider. Each KwikPen contains four weekly injections, so a month's supply is one pen.
- Starting doses (2.5–5 mg): typically £129–£180/month
- Mid-range doses (7.5–10 mg): typically £180–£240/month
- Higher doses (12.5–15 mg): typically £240–£320/month
Private access requires an online clinical assessment with a UK-licensed prescriber followed by a prescription dispensed by a GPhC-registered pharmacy. You pay for each monthly prescription — there is no NHS subsidy. Use our GLP-1 weight loss calculator to estimate potential results, and consult your BMI using our free BMI calculator to understand your eligibility baseline.
- 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 is Mounjaro so expensive in the UK?
Mounjaro is a relatively new dual GIP/GLP-1 receptor agonist with significant manufacturing and development costs. Novo Nordisk (Eli Lilly manufactures Mounjaro) sets UK pricing. Private prescribing costs reflect the medication cost plus clinical assessment and dispensing fees. NHS prescriptions are free but access is limited to specialist services.
Is Mounjaro available on the NHS in my area?
NHS Mounjaro availability is patchy. Contact your GP to ask about local tier 3 weight management services and whether Mounjaro is currently available in your region. You can also check your Integrated Care Board (ICB) website for commissioning information. Many areas have very limited or no current access.
How do Mounjaro costs compare to Wegovy?
Both medications cost roughly £129–£320/month privately depending on dose, with similar variation. Mounjaro is a dual GIP/GLP-1 agonist (different mechanism), while Wegovy (semaglutide) is a single GLP-1 agonist. Clinical trial data shows slightly higher average weight loss with Mounjaro, but results vary. Costs are comparable; ask your prescriber about both options.
Can I get Mounjaro cheaper if I order it privately?
Private Mounjaro prices are fairly consistent across GPhC-registered UK pharmacies (£129–£320/month). Prices differ by dose, not by pharmacy. Always use a registered UK pharmacy and licensed prescriber — avoid unregistered online sources, which may sell counterfeit or unsafe medications.
What happens if I stop taking Mounjaro?
Weight typically returns over time after stopping Mounjaro — clinical trials show most people regain weight within months if they return to previous eating habits. Mounjaro works alongside lifestyle changes (diet and exercise), not instead of them. Speak to your prescriber about a plan if you need to stop or change weight loss medications.
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.