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
When Will Mounjaro Be Available On The NHS?
Mounjaro (tirzepatide) is already approved for use within the NHS — NICE gave its recommendation in 2024. However, availability varies significantly across UK regions, and access is through specialist tier 3 and tier 4 weight management services, not your GP. This means you'll need a referral and may face waiting lists. Let's explain the current NHS situation, eligibility criteria, and your access 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.
Current NHS Status and Regional Availability
Mounjaro is now approved by NICE for use within NHS specialist weight management services. This was a significant development, but approval at NICE level does not mean immediate availability everywhere. NHS funding and access depend on your local Integrated Care Board (ICB) and the specialist services available in your region.
Some regions have already begun prescribing Mounjaro through tier 3 weight management clinics, whilst others have longer waiting lists or more limited access. Tier 3 services are hospital-based or specialist outpatient services — you cannot get Mounjaro directly from your GP surgery. You'll need a referral from your GP to your regional weight management service.
- Tier 3 services: Community-based or hospital outpatient specialist weight management
- Tier 4 services: Bariatric surgery centres and complex weight management
To find your local tier 3 weight management service, ask your GP or contact your ICB directly. Waiting times vary from a few weeks to several months depending on demand and regional resources.
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 Eligibility and Private Access Options
To access Mounjaro via the NHS, you must meet NICE eligibility criteria: a BMI of 30 kg/m² or above, or BMI of 27–29.9 kg/m² with at least one weight-related condition such as type 2 diabetes, high blood pressure, or sleep apnoea. Use our free BMI calculator above to check where you stand.
If NHS waiting lists are long in your area or you don't want to wait, Mounjaro is also available privately through UK-licensed prescribers and GPhC-registered pharmacies. Private access typically involves an online clinical assessment and costs between £129–£320 per month depending on your dose and the provider. Both NHS and private routes require a prescription and clinical assessment — Mounjaro is prescription-only and not available over the counter.
- 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 available on the NHS now?
Yes, NICE approved Mounjaro for NHS use in 2024. It is available through NHS tier 3 specialist weight management services, but availability and waiting times vary by region. You'll need a GP referral to access it through the NHS.
How do I get Mounjaro on the NHS?
Ask your GP for a referral to your local tier 3 weight management service. Your GP will assess whether you meet eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions). The specialist service will then conduct a full assessment before prescribing.
What are the NHS eligibility criteria for Mounjaro?
You need a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with at least one weight-related condition (type 2 diabetes, high blood pressure, sleep apnoea, cardiovascular disease, or dyslipidaemia). Lower BMI thresholds may apply if you're of South Asian, Chinese, Black African, or Black Caribbean heritage.
How long are NHS waiting lists for Mounjaro?
Waiting times vary significantly by region — from a few weeks to several months. Contact your local ICB or ask your GP about current waiting times in your area. Private access may be faster if you prefer not to wait.
Can I get Mounjaro privately if NHS waiting lists are too long?
Yes. Mounjaro is available privately through UK-licensed prescribers following an online clinical assessment. Costs range from approximately £129–£320 per month. Both NHS and private routes require a prescription — tirzepatide is prescription-only.
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.