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 To Qualify For Mounjaro In The UK
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through both NHS specialist services and private online prescribing. To qualify, you'll need to meet specific BMI criteria and have a clinical assessment from a licensed prescriber. This guide explains UK eligibility requirements, the difference between NHS and private access routes, typical costs, and what happens during an online consultation. Individual circumstances vary, so your GP or prescriber will assess whether Mounjaro is suitable 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 Mounjaro Eligibility And Access Routes
To qualify for Mounjaro in the UK, you must meet these BMI eligibility criteria:
- BMI of 30 kg/m² or above (obesity), OR
- BMI of 27–29.9 kg/m² with at least one weight-related health condition
Weight-related conditions include type 2 diabetes, high blood pressure, abnormal blood fats, obstructive sleep apnoea, or cardiovascular disease history. Adults of South Asian, Chinese, Black African, or Black Caribbean backgrounds may qualify at lower BMI thresholds (from BMI 27.5+) due to higher health risk at lower weights — this aligns with NHS NICE guidance.
You must be 18 years or older and not pregnant, planning pregnancy, or breastfeeding. Medical conditions affecting digestion or severe allergies to tirzepatide may disqualify you. A prescriber will review your full medical history during assessment. Our free BMI calculator helps you check whether you may meet the initial BMI threshold.
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 Vs Private: Cost And Access In The UK
NHS access: Mounjaro is approved by NICE (National Institute for Health and Care Excellence) for NHS specialist weight management services. You'll need a referral from your GP to tier 3 or tier 4 specialist services — free on the NHS but waiting lists vary widely by region (ICB), sometimes extending months to years.
Private access: Available through UK-licensed prescribers via online consultation without NHS referral. Private costs typically range from £150–£300+ per month depending on your dose. The KwikPen device costs vary by supplier. Online consultations usually cost £20–£50 and are often credited toward your first prescription. Private prescriptions are dispensed by GPhC-registered pharmacies. Both routes require a clinical assessment; private assessments are completed remotely via secure online forms and video calls.
What to expect in an online consultation: You'll complete a detailed health questionnaire covering weight history, current medications, allergies, blood pressure, and any diabetes or cardiovascular conditions. A UK-licensed prescriber reviews your information and health records, then decides if Mounjaro is appropriate. If approved, a prescription is issued and sent to a registered pharmacy for dispensing. Dose titration starts at 2.5 mg weekly and increases every 4 weeks if tolerated. You receive ongoing support via email or phone for dose adjustments and side effect management. Prescription renewals require periodic check-ins (typically every 3–6 months) to ensure continued suitability. Always inform your prescriber of new medications or health changes.
- 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.
What BMI do I need to qualify for Mounjaro in the UK?
You need a BMI of 30 kg/m² or above, or BMI of 27–29.9 kg/m² if you have a weight-related health condition such as type 2 diabetes, high blood pressure, or heart disease. If you're of South Asian, Chinese, Black African, or Black Caribbean descent, lower thresholds apply. Use our free BMI calculator to check your personal BMI instantly.
How much does Mounjaro cost on the NHS?
Mounjaro is free on the NHS if prescribed through specialist tier 3 or tier 4 weight management services following NICE guidance. However, NHS access requires a GP referral and availability varies significantly by region — waiting lists can be lengthy in many areas.
What's the typical cost of private Mounjaro in the UK?
Private Mounjaro typically costs £150–£300+ per month depending on your dose and supplier. A starting dose of 2.5 mg costs less than the maximum 15 mg dose. Online consultations usually cost £20–£50 and are often applied as a credit to your first prescription. Individual supplier costs vary.
How does the private online consultation process work?
You complete an online health questionnaire covering medical history, current medications, and weight-related conditions. A UK-licensed prescriber reviews your information and decides if Mounjaro is suitable. If approved, a prescription is issued to a registered pharmacy for dispensing. The entire process is remote via secure online forms.
Can I get Mounjaro from my GP directly?
GPs do not typically prescribe Mounjaro in general practice. NHS access is through specialist weight management services — your GP can refer you to your local tier 3 service. Private prescribing is available online without NHS referral, following a clinical assessment by a licensed prescriber.
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.