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
Where Can I Get Mounjaro From in the UK?
Mounjaro (tirzepatide) is available in the UK through two main routes: NHS specialist weight management services and private online prescribing. Access depends on your eligibility, location, and whether you choose public or private healthcare. Both routes require a clinical assessment and a valid prescription from a UK-licensed prescriber. This guide explains how to access Mounjaro through each pathway, what to expect, and the key differences between NHS and private access in the UK.
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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
The NHS route involves referral to a tier 3 or tier 4 specialist weight management service. Your GP can refer you if you meet eligibility criteria: a BMI of 30 kg/m² or above, or BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. South Asian, Chinese, Black African, and Black Caribbean adults may be eligible at lower BMI thresholds.
NICE (the National Institute for Health and Care Excellence) has approved tirzepatide for use within NHS specialist weight management services. However, NHS availability varies significantly by region. Some integrated care boards (ICBs) offer Mounjaro through their weight management services, while others may have limited or no access due to funding constraints and long waiting lists.
To access Mounjaro on the NHS, speak to your GP about referral to your local specialist weight management service. Be prepared for possible waiting times of several months to over a year in some areas.
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 Access to Mounjaro in the UK
Private prescribing offers faster access without NHS waiting lists. Licensed private prescribers assess your suitability for tirzepatide through an online consultation. If approved, they issue a prescription that you collect from a GPhC-registered pharmacy. This process typically takes 1–2 weeks from consultation to first delivery.
Private Mounjaro costs range from approximately £129 to £320 per month, depending on your dose. Unlike the NHS, private access does not require prior NHS referral. You remain responsible for managing your own ongoing care and monitoring, though many private providers offer follow-up support and dose adjustments. Private access is most suitable if you meet clinical eligibility criteria and can afford treatment costs.
To find a private prescriber, search for UK-licensed online weight management providers that are registered with the GPhC (General Pharmaceutical Council). Verify that any provider you consider is genuinely registered and legitimate before proceeding. Once prescribed, you can use our free GLP-1 weight loss calculator to project potential weight loss at different doses, and our BMI calculator to track your progress alongside treatment. Many people also benefit from our weight converter and progress tracker to monitor their journey in UK measurements (stone and pounds).
- 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 is the difference between NHS and private Mounjaro access?
NHS access is free but involves waiting lists and regional variation; private access is faster (1–2 weeks) but costs £129–£320 monthly. Both require clinical assessment and a valid prescription. NHS is ideal if you can wait; private is better if you need faster access and can afford treatment.
Do I need a GP referral to get Mounjaro privately?
No. Private prescribers conduct their own clinical assessment online. You don't need NHS referral. However, it's worth informing your GP you're starting treatment so they can monitor your health and adjust any other medications if needed.
What are the NHS eligibility criteria for Mounjaro?
BMI of 30 kg/m² or above, or BMI 27–29.9 with weight-related conditions like type 2 diabetes or high blood pressure. South Asian, Chinese, Black African, or Black Caribbean adults may qualify at BMI 27.5 or above. Your GP can assess your eligibility.
How long does it take to get Mounjaro through the NHS?
Waiting times vary widely by region. Some specialist services have waits of several months to over a year. Private access is faster, typically 1–2 weeks from consultation to first delivery.
Can I switch from Wegovy to Mounjaro?
Yes, your prescriber can switch you between GLP-1 and GIP/GLP-1 medications like Mounjaro. Approximate dose equivalences exist, but any switch should be managed by your prescriber. Individual results vary with either medication.
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.