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 7.5 mg Pen — UK Prescribing and Eligibility
The Mounjaro 7.5 mg pen is the third escalation dose in the tirzepatide weight management titration schedule available in the UK. This dose is typically reached after 8–12 weeks of treatment and represents a significant step up in efficacy from the 5 mg starting dose. Understanding NHS eligibility, NICE guidance, and how to access this dose through the NHS or privately is essential for anyone considering Mounjaro treatment 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 Eligibility and NICE Guidance for Mounjaro
NICE approval: NICE has approved tirzepatide (Mounjaro) for use within NHS specialist weight management services for eligible adults. Access is through tier 3 specialist weight management services, not standard GP prescribing.
Eligibility criteria: Adults with a BMI of 30 kg/m² or above, or 25–29.9 kg/m² with at least one weight-related health condition (type 2 diabetes, prediabetes, hypertension, dyslipidaemia, obstructive sleep apnoea, or cardiovascular disease history). South Asian, Chinese, Black African, and Black Caribbean adults may qualify at lower BMI thresholds (27.5 kg/m² and above).
Tier 3 services: You cannot obtain Mounjaro directly from your GP. Referral to a specialist NHS tier 3 weight management service is required. Regional waiting lists vary significantly — some areas have waiting times of several months or longer. Calculate your current BMI using our free BMI calculator to see if you fall within the eligibility range.
Dose escalation: The 7.5 mg dose is not a starting point. Standard NHS protocol involves beginning at 2.5 mg, then escalating every 4 weeks (2.5 mg → 5 mg → 7.5 mg → 10 mg → 12.5 mg → 15 mg maximum).
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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 Access for Mounjaro 7.5 mg
NHS route: Free on prescription if approved by a tier 3 service, but eligibility is strict and waiting lists are lengthy. Once approved and on treatment, the prescription cost is standard NHS charge (currently £9.65 in England for eligible patients, or free if exempt).
Private route: Available through GPhC-registered online pharmacies following a consultation with a UK-licensed prescriber. Faster access than NHS — typically within 1–2 weeks. Private costs range from £180–£280 per pen depending on dose and provider, with no waiting list. The 7.5 mg dose is the same whether NHS or private — the difference is access speed and cost.
Clinical assessment: Both routes require a prescriber assessment. Private providers will ask about eligibility criteria, medical history, and current medications before issuing a prescription. This is a legal requirement and protects your safety.
- 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 7.5 mg dose on Mounjaro?
Starting at 2.5 mg and escalating every 4 weeks (the standard protocol), you would reach 7.5 mg after 8 weeks of treatment. However, some prescribers may adjust the titration schedule based on side effects or tolerance. Always follow your prescriber's guidance.
Is the 7.5 mg dose the maximum I can take on Mounjaro?
No. 7.5 mg is an intermediate dose. Mounjaro escalates to 10 mg, 12.5 mg, and finally 15 mg (the maximum). Your prescriber will recommend escalation based on your response and any side effects.
Will the NHS cover Mounjaro 7.5 mg if I'm referred to a tier 3 service?
If approved by a specialist tier 3 weight management service, Mounjaro is free on NHS prescription. However, not all areas have equal access, and eligibility criteria must be met. Ask your GP about tier 3 referral and expected waiting times in your region.
What are the side effects of Mounjaro 7.5 mg compared to lower doses?
Side effects are typically more pronounced at higher doses. Common effects include nausea, diarrhoea, and stomach pain. Most improve within weeks as your body adjusts. Serious side effects are rare but require immediate medical attention — seek help if you experience severe stomach pain or signs of pancreatitis.
Can I use our weight loss calculator to estimate results at 7.5 mg?
Yes. Our free GLP-1 weight loss calculator helps you project potential outcomes at different Mounjaro doses. Remember that individual results vary — clinical trials show average weight loss around 19.5% body weight on 10 mg, with 7.5 mg typically producing somewhat less. Your prescriber can give you personalised expectations.
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.