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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Mounjaro 7.5mg — NHS Eligibility & Prescribing in the UK
Mounjaro 7.5mg is the second escalation dose of tirzepatide, a prescription weight loss injection licensed in the UK. This guide explains NHS and UK private access routes, NICE guidance, and what to expect at this dose level. In the UK, Mounjaro is typically prescribed through specialist tier 3 weight management services or private online prescribing following clinical assessment. If you're considering this medication, understanding your eligibility and the prescribing pathway is essential.
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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 Mounjaro Access & Eligibility in the UK
NHS prescribing pathway: Mounjaro is prescribed through specialist tier 3 and tier 4 weight management services. You'll typically need a GP referral to access these services, though availability varies significantly by region and integrated care board (ICB). NICE has approved tirzepatide for use within NHS weight management programmes, but access is not routine GP prescription.
- You may be eligible if you have a BMI of 30 or above, or 27–29.9 with a weight-related health condition (type 2 diabetes, hypertension, dyslipidaemia, sleep apnoea, or cardiovascular disease)
- For South Asian, Chinese, Black African, or Black Caribbean patients, lower BMI thresholds may apply (from BMI 27.5)
- NHS waiting lists for specialist services can be lengthy — sometimes 6 months to 2+ years depending on your area
- Once prescribed, NHS funding covers the medication if you meet the service's ongoing eligibility criteria
Use our free BMI calculator above to check whether you might meet the BMI-based criteria for consideration.
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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.
NHS Versus Private Access for Mounjaro 7.5mg
Private access route: You can also access Mounjaro through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber. This doesn't require NHS referral and is often faster — typically available within days to weeks rather than months. Cost varies by provider and dose, but expect approximately £129–£320 per month depending on your current dose level.
- Private prescribers assess your clinical suitability remotely
- The 7.5mg dose is an escalation dose — you'll usually have started at 2.5mg and progressed weekly or every 4 weeks
- Private and NHS prescribers both follow the same safety protocols and MHRA guidance for tirzepatide
- 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 Mounjaro 7.5mg used for in the UK?
Mounjaro 7.5mg is a GIP and GLP-1 receptor agonist injection used for weight management in UK adults with a BMI of 30 or above, or 27 or above with weight-related health conditions. At this dose, you're typically in the escalation phase — week 9–12 of treatment. It's a prescription-only medicine requiring clinical assessment.
How long should I stay on Mounjaro 7.5mg before increasing to 10mg?
MHRA guidance recommends staying on each dose of Mounjaro for a minimum of 4 weeks before escalating. Your prescriber will assess your tolerance, side effects, and weight loss response before moving to the next dose. Never increase your dose without guidance from your prescriber.
Can I get Mounjaro 7.5mg on the NHS in the UK?
Yes, Mounjaro is approved by NICE for NHS use through specialist tier 3 and tier 4 weight management services. However, NHS access requires a GP referral to your local service and waiting lists can be very long. Private access through online prescribers is often faster but involves a cost to you.
What are the common side effects of Mounjaro 7.5mg?
At 7.5mg, common side effects include nausea, diarrhoea, constipation, stomach pain, and reduced appetite. Most side effects are mild and temporary. However, if you experience severe stomach pain, vomiting, or signs of an allergic reaction, contact your GP or NHS 111 immediately.
How does Mounjaro 7.5mg compare to Wegovy for weight loss?
Both are prescription weight loss injections licensed in the UK. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. Clinical trials show similar average weight loss, but individual results vary. Your prescriber will advise which is more suitable for you. Try our GLP-1 weight loss calculator to estimate potential outcomes.
Ready to take control of your weight loss journey?
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