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 Get Mounjaro in the UK Without a Subscription Model
Unlike some weight loss programmes, Mounjaro (tirzepatide) in the UK is prescribed as individual doses rather than requiring ongoing subscription commitments. Whether you access Mounjaro through NHS specialist services or private prescribing, you pay for the medication itself—not a membership. This guide explains how Mounjaro prescribing works in the UK, eligibility criteria, and the key differences between NHS and private routes. Understanding your options helps you make informed decisions about this prescription-only weight management 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 to Mounjaro: Eligibility and Tier 3 Services
Mounjaro prescribing through the NHS is managed by specialist tier 3 weight management services, not your GP. You'll need a referral from your GP to access these services, which assess whether you're eligible for prescription weight loss treatment.
- Eligibility: BMI of 30 kg/m² or above, or BMI 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease, or obstructive sleep apnoea)
- Ethnicity-adjusted thresholds: For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds apply (27.5 or above)
- Age requirement: 18 years and over
- No subscription model: You pay per prescription (typically covered by NHS once approved through tier 3)
Waiting times for NHS tier 3 services vary significantly by region, from several months to over a year in some areas. When Mounjaro is prescribed, dosing follows a titration schedule starting at 2.5 mg and escalating to 15 mg maximum, with a minimum of 4 weeks at each dose before adjustment.
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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.
Private Prescribing Route: Non-Subscription Access to Mounjaro
Private prescribing offers faster access to Mounjaro without subscription requirements. You can consult with a UK-licensed prescriber online, and if clinically appropriate, receive a prescription to be dispensed by a GPhC-registered pharmacy. Costs vary by dose and provider, typically ranging from £129–£320 per month, depending on the specific dose (starting at 2.5 mg through to 15 mg maximum).
Clinical trials (SURMOUNT-1) showed that participants on 15 mg Mounjaro lost an average of approximately 20.9% of their body weight over 72 weeks, alongside reduced-calorie diet and increased physical activity. Individual results vary significantly. You can estimate potential weight loss using our free GLP-1 weight loss calculator based on your personal characteristics and dose progression.
Both NHS and private routes require a clinical assessment to confirm Mounjaro is suitable for you. Your medical history, current medications, and weight-related health conditions will be reviewed. There is no subscription lock-in with either route—you can stop treatment at any time, though NHS tier 3 services may have specific follow-up protocols. Use our free BMI calculator to check whether you fall within the eligibility thresholds for prescription weight loss treatment in the UK.
- 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.
Does Mounjaro require a subscription or ongoing membership in the UK?
No. Mounjaro is prescribed as individual weekly injections without subscription fees. Whether through NHS or private prescribing, you pay per prescription. There's no mandatory ongoing membership or contract required. You can adjust or stop treatment following guidance from your prescriber.
What's the difference between NHS and private Mounjaro access?
NHS access requires GP referral to tier 3 specialist services and may involve waiting lists. Prescriptions are covered by the NHS once approved. Private prescribing offers faster access through online consultants and GPhC-registered pharmacies, with direct costs to you ranging from approximately £129–£320 monthly depending on dose.
How much does Mounjaro cost in the UK privately?
Private Mounjaro costs typically range from £129–£320 per month, varying by dose and provider. Costs increase as you titrate to higher doses (2.5 mg to 15 mg). NHS prescriptions are free once approved through specialist tier 3 services, though NHS access may require substantial waiting times.
What are the NHS eligibility criteria for Mounjaro?
NHS eligibility includes BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions like type 2 diabetes or cardiovascular disease. South Asian, Chinese, Black African, or Black Caribbean adults may qualify at lower BMI thresholds (27.5+). You must be 18+ years old and referred by your GP to tier 3 services.
How long does it take to get Mounjaro through the NHS?
NHS waiting times vary significantly by region (ICB). In some areas, specialist tier 3 services can assess and prescribe within months; in others, waiting lists exceed one year. Private prescribing typically offers access within days to weeks, pending online clinical assessment.
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.