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 Access & UK Health Information
Mounjaro 7.5mg is an escalation dose of tirzepatide, a GLP-1 and GIP receptor agonist used for weight management in UK adults. This dose is typically reached after 8–12 weeks of treatment, following dose escalation from 2.5mg and 5mg. Understanding how Mounjaro works within the NHS system, who can access it, and what this dose level means for your treatment is essential for anyone considering this weight loss injection in the UK.
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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 Access to Mounjaro 7.5mg in the UK
Mounjaro 7.5mg is available through NHS specialist tier 3 weight management services, though access varies significantly by region and ICB (Integrated Care Board). Unlike some medications prescribed in primary care, Mounjaro requires assessment and prescription through a specialist multidisciplinary team. To access Mounjaro on the NHS, you typically need a referral from your GP to your local tier 3 weight management service. Eligibility criteria include a BMI of 30 or above (or 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or cardiovascular disease). For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds of 27.5 or above may apply due to higher health risks at these levels. Once referred, you will be assessed for suitability, and if approved, the service will initiate treatment starting at 2.5mg, escalating to 7.5mg at week 9–12 if tolerated well.
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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 vs. Private Routes for Mounjaro 7.5mg
NHS access typically involves waiting lists (currently several months to over a year in many areas) and regional variation in availability. Some ICBs have suspended new referrals due to demand. Private access is available through GPhC-registered online prescribing services, where UK-licensed prescribers assess your suitability following an online consultation. Private costs range from £129–£320 per month depending on dose and provider. Both routes require a clinical assessment—no prescription is issued without one. Your GP can advise which route is most appropriate for your circumstances, and many people choose private access due to shorter waiting times. Whichever route you take, Mounjaro 7.5mg should always be used alongside a reduced-calorie diet and increased physical activity for best results.
- 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.
How long does it take to reach the 7.5mg Mounjaro dose?
You start at 2.5mg for weeks 1–4, increase to 5mg at week 5, and typically reach 7.5mg at week 9 (dose increases every 4 weeks minimum). This timeline assumes good tolerance. Some people may progress more slowly if side effects are significant.
What weight loss can I expect at 7.5mg Mounjaro?
Clinical trials show tirzepatide produces progressive weight loss, with around 15–20% average body weight loss at higher doses. However, individual results vary significantly. Many people see increasing weight loss as the dose escalates, but this is not assured.
Is Mounjaro 7.5mg available on the NHS in all UK areas?
Availability varies by region and ICB. Some areas have limited capacity or waiting lists; others have suspended new referrals temporarily. Contact your local NHS weight management service or your GP for current availability in your area.
Can I get Mounjaro 7.5mg privately after starting on the NHS?
Yes, you can switch between NHS and private routes, though you should discuss this with both your NHS team and private prescriber to ensure safe transition. Never overlap prescriptions from both sources.
What are the main side effects at the 7.5mg dose?
Common side effects include nausea, diarrhoea, constipation, and reduced appetite—typically experienced in the first few weeks at each dose increase. Most side effects ease over time. Serious side effects are rare but require immediate medical attention.
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.