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
Can You Get Mounjaro On The NHS In The UK?
Yes, Mounjaro (tirzepatide) is available on the NHS, but access is limited to specialist weight management services and varies significantly by region. The medication was approved by NICE for use within the NHS, though it is not routinely prescribed in general practice. Most people access Mounjaro through either NHS tier 3 specialist services (with potentially lengthy waiting lists) or through private prescription via a UK-licensed online prescriber following a clinical assessment. Understanding your options and what to expect can help you decide the best route for your situation.
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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 To Access Mounjaro On The NHS In The UK
NHS access to Mounjaro is through specialist tier 3 weight management services, not your GP surgery. You typically need a referral from your GP to a specialist multidisciplinary weight management service in your area. Once referred, a specialist team (including doctors, dietitians, and behavioural specialists) will assess your eligibility based on BMI, weight-related health conditions, and previous weight loss attempts.
NICE has approved tirzepatide for use within NHS specialist services, but availability and waiting times vary dramatically by region. Some areas have specialist services with waiting lists of several months or longer; other regions have very limited capacity. Your GP can tell you about services available in your local integrated care board (ICB). If you meet NHS eligibility criteria (BMI 30 or above, or 27–29.9 with weight-related conditions), you may be considered, though funding and availability differ across the UK. The specialist team will discuss whether this weekly weight loss injection is appropriate for you alongside lifestyle changes.
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 Prescription Access & What It Costs
Private access to Mounjaro is faster and does not require an NHS referral. You can obtain a prescription through a GPhC-registered online pharmacy following an online consultation with a UK-licensed prescriber. Private Mounjaro typically costs between £130–£300 per month depending on the dose you need (starting at 2.5 mg, up to maximum 15 mg weekly).
The private route involves completing an online health questionnaire, having a video or phone consultation with a prescriber who assesses your suitability, and if approved, receiving a prescription dispensed by a registered pharmacy. This process usually takes 1–3 working days. Private costs are higher than NHS but offer faster access without waiting lists. Use our free GLP-1 weight loss calculator to estimate potential results at different doses, and our BMI calculator to check your current BMI against eligibility criteria.
- 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 in 2025?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use within specialist tier 3 weight management services. However, access is limited and varies by region. Many areas have long waiting lists. Your GP can refer you to your local specialist service if you meet eligibility criteria.
How much does Mounjaro cost privately in the UK?
Private Mounjaro typically costs £130–£300 per month depending on your dose. Starting dose is 2.5 mg; maximum is 15 mg weekly. Private access is faster than NHS but costs more. Prices vary slightly between providers.
What are the NHS eligibility criteria for Mounjaro?
You may be eligible if you have a BMI of 30 or above, or 27–29.9 with a weight-related condition such as type 2 diabetes, hypertension, or sleep apnoea. Lower BMI thresholds apply for South Asian, Black African, or Black Caribbean adults. Your specialist team will assess individual circumstances.
How long are NHS waiting lists for Mounjaro?
Waiting times vary significantly by region. Some specialist services have waiting lists of 3–6 months or longer; others have limited capacity. Contact your local integrated care board (ICB) or ask your GP about waiting times in your area.
Can I switch from NHS to private Mounjaro prescription?
Yes, you can switch between NHS and private routes. If you start privately and later access NHS services, or vice versa, discuss this with your prescriber or specialist team to ensure safe transition and dose continuity.
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.