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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Fatty Liver and Mounjaro — How to Access Treatment in the UK
Fatty liver disease (including non-alcoholic fatty liver disease, or NAFLD) is increasingly common in the UK, particularly in adults who are overweight or obese. Mounjaro (tirzepatide) is a prescription-only weight management injection that may help reduce weight-related strain on the liver. If you're interested in accessing Mounjaro for fatty liver and weight management, you'll need to understand both NHS and private routes available in the UK, including costs and eligibility criteria. This guide explains your options.
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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.
How Much Does Mounjaro Cost in the UK?
Mounjaro costs vary significantly depending on whether you access it through the NHS or privately. On the NHS, Mounjaro is provided free at point of care once prescribed through a specialist tier 3 or tier 4 weight management service — though availability and waiting times vary considerably by region and integrated care board (ICB). Privately, Mounjaro costs approximately £129 to £320 per month depending on your starting dose and provider, with costs typically increasing as you progress through dose titration (from 2.5 mg to your maintenance dose). A standard prescription covers 4 weeks of treatment (4 pre-filled KwikPen pens). Additional costs may include the initial online clinical assessment (typically £20–£50) and follow-up consultations. Private providers do not usually offer free ongoing monitoring, so regular blood tests or GP check-ins may incur additional costs. Use our free GLP-1 weight loss calculator to estimate potential weight loss at different doses, which can help you decide if the investment is worth exploring with a prescriber.
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 Access — Which Route Is Right for You?
NHS access: Referral to specialist services required; free treatment but long waiting lists (often 6–18 months or longer in many areas); assessment by a multidisciplinary team; strict eligibility criteria. Private access: Online consultation with a UK-licensed prescriber; faster access (typically 1–2 weeks); no need for GP referral; flexible eligibility; pay per prescription. For fatty liver disease specifically, both routes require your prescriber to assess whether Mounjaro is appropriate for your individual health. GPs can refer you to NHS services if you meet eligibility criteria, or you can arrange a private online assessment directly. Whichever route you choose, weight loss alongside a healthy diet and exercise is the most effective way to improve liver health. Track your progress with our free progress tracker to monitor both weight loss and how you feel over time.
- 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.
Will the NHS prescribe Mounjaro for fatty liver disease specifically?
The NHS prescribes Mounjaro (tirzepatide) for weight management based on BMI and weight-related health conditions. Fatty liver disease may qualify as a weight-related condition, but eligibility depends on your individual circumstances and your local ICB. Your GP can refer you to specialist tier 3 services for assessment. Always discuss your fatty liver diagnosis with your GP when exploring weight management options.
How long does it take to access Mounjaro privately in the UK?
Private access is typically faster than NHS. After booking an online consultation, you may receive a prescription within 1–2 weeks if approved. Your prescription is then sent to a GPhC-registered pharmacy for dispensing. This is significantly quicker than NHS waiting lists, which can exceed 18 months in some regions.
Can I switch from NHS to private Mounjaro, or vice versa?
Switching between NHS and private prescription is possible but requires coordination with your prescriber. If you're on the NHS and want to go private, you may need to pause NHS treatment. If you're private and want to switch to NHS, your GP would need to refer you to specialist services, though they may request a period off medication first.
What happens during a private online Mounjaro consultation?
A UK-licensed prescriber will review your medical history, current medications, weight, BMI, and any health conditions (including fatty liver). They'll assess your eligibility, discuss risks and benefits, and if appropriate, issue a prescription. Consultations typically take 15–30 minutes. You'll need to provide accurate health information for safety.
Is Mounjaro cheaper on the NHS than privately?
Yes — Mounjaro is free on the NHS once prescribed through specialist services. Privately, costs range from £129–£320+ per month depending on dose. However, NHS access requires meeting eligibility criteria and typically involves longer waits. For some people, private access and cost may be worth it for faster treatment, especially if NHS waiting lists are very long locally.
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.