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
Free tracker included with every download this week
Is Mounjaro Available in the UK? Cost, Access & How to Get It
Yes, Mounjaro (tirzepatide) is available in the UK as a prescription-only weight management injection. Access depends on whether you pursue NHS or private routes, and costs vary significantly between them. The NHS offers Mounjaro through specialist weight management services for eligible adults, though availability and waiting times differ by region. Private access is available through online prescribing services following a clinical assessment. Understanding your eligibility and the differences between these routes can help you make an informed decision about whether Mounjaro is right for you.
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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.
UK Private Mounjaro Costs & Prescription Access
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on your dose and the prescribing service. The 2.5 mg starter dose is usually the least expensive, while higher doses (10 mg, 15 mg) cost more. Most private services charge per pen or per 4-week supply. Your prescriber will assess your eligibility through an online consultation, checking your BMI, medical history, and any weight-related health conditions. You can use our free BMI calculator to check your current BMI before your consultation — this helps you understand whether you meet typical eligibility criteria (BMI ≥30, or ≥27 with weight-related conditions like type 2 diabetes or high blood pressure). Private access is faster than NHS, often with prescriptions issued within days of approval. Payment is typically upfront, and prescriptions are dispensed by GPhC-registered pharmacies.
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.
NHS Access vs Private Routes Explained
NHS access requires referral to your local tier 3 specialist weight management service through your GP. NICE has approved tirzepatide for NHS use, but availability varies significantly by region (ICB), and waiting lists can be months or years in some areas. Private access requires no NHS referral — you complete an online consultation with a UK-licensed prescriber, who assesses your eligibility independently. Private services are faster but carry full cost responsibility. The online consultation process typically involves answering health questions, providing your weight and height (allowing you to calculate your BMI), and discussing your medical history. Your prescriber will confirm whether Mounjaro is suitable, and if approved, a prescription is sent to a pharmacy for dispatch. Always ensure the service is GPhC-registered for safety and legality.
- 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?
NHS access is free once prescribed, but involves referral and waiting times that can stretch months. Private costs £129–£320 monthly depending on dose but offers faster access without NHS referral. Which is better depends on your timeline and circumstances.
What dose of Mounjaro will I be prescribed?
Your prescriber starts you on 2.5 mg (the starter dose) for the first 4 weeks, then increases gradually to find the effective dose for you. The maximum is 15 mg weekly. Dose titration is individualised based on your response and tolerance.
Can I switch between NHS and private Mounjaro?
Yes, though it requires coordination with your prescriber. If you start privately and later access NHS treatment, inform both services to avoid overlap. Conversely, NHS patients can move to private prescribing if they prefer faster access or dose adjustments.
Do I need blood tests before starting Mounjaro?
Your prescriber may request blood tests to check kidney function, pancreatic markers, and other health parameters — particularly if you have diabetes or other conditions. Private services vary; NHS services typically require baseline health checks.
What happens if I can't afford private Mounjaro?
Explore NHS referral through your GP if you're eligible. Some private services offer payment plans or reduced-dose options. Our GLP-1 weight loss calculator can help you explore potential outcomes at different dose levels and access routes.
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.