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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How Much ml Is 7.5mg Mounjaro?
The 7.5mg dose of Mounjaro (tirzepatide) is supplied as 2.27ml of solution in a pre-filled KwikPen device. This is the third escalation dose in the standard UK titration schedule and represents a significant step up from the 5mg starting dose. Understanding how Mounjaro is measured and dosed helps you follow your prescription correctly and track your progress through the treatment pathway. Our GLP-1 weight loss calculator can help you estimate potential weight loss at different doses including 7.5mg.
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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.
Mounjaro 7.5mg Dosing and NHS Context
The 7.5mg dose of Mounjaro is typically reached around weeks 9–12 of treatment, following the standard dose escalation schedule. Each KwikPen contains a full month's supply (4 weeks of injections at a single dose). The 2.27ml volume is consistent across all Mounjaro strengths — the difference between doses is the concentration of tirzepatide, not the injection volume.
- Week 1–4: 2.5mg (starting dose)
- Week 5–8: 5mg (first escalation)
- Week 9–12: 7.5mg (second escalation — the 2.27ml dose discussed here)
- Week 13–16: 10mg (further escalation if needed)
- Week 17+: Higher doses up to 15mg maximum
In clinical trials, the 7.5mg dose showed an average weight loss of approximately 16–17% of body weight when combined with reduced-calorie diet and increased physical activity. Individual results vary significantly — some people respond well at this dose, whilst others require the maximum 15mg to achieve target weight loss. Your prescriber will assess your progress and determine whether to continue at 7.5mg or escalate further.
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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 Eligibility and Mounjaro Access in the UK
Access to Mounjaro 7.5mg and other doses through the NHS is available through specialist tier 3 weight management services following assessment by your GP. NICE has approved tirzepatide (Mounjaro) for use in NHS specialist services for adults with a BMI of 30 or above, or BMI 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 apply — MHRA guidance recognises these groups face higher cardiometabolic risk at lower weights. Private access to Mounjaro is available through UK-licensed prescribers and registered pharmacies without requiring NHS tier 3 referral, though clinical assessment is still mandatory. Use our free BMI calculator to check your personal BMI and explore whether you might meet 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 7.5mg Mounjaro a high dose?
No — 7.5mg is a mid-range dose. The maximum is 15mg once weekly. 7.5mg typically represents the second or third escalation step in the titration schedule. Most people either respond at 7.5mg or continue escalating to 10mg or higher depending on weight loss progress and tolerability.
How long should I stay on 7.5mg Mounjaro before increasing?
You should remain on any Mounjaro dose for a minimum of 4 weeks before increasing to the next dose level. Your prescriber will review your progress, tolerability of side effects, and weight loss response before recommending escalation. Some people remain on 7.5mg as their maintenance dose if results are satisfactory.
What are the side effects at 7.5mg Mounjaro?
Side effects at 7.5mg are typically similar to lower doses but may be more pronounced: nausea, diarrhoea, constipation, vomiting, and stomach pain are most common. These usually decrease after 1–2 weeks at each new dose. Serious side effects (severe stomach pain, pancreatitis, gallbladder issues) are rare but require immediate medical attention.
Can I get 7.5mg Mounjaro on the NHS?
Yes, Mounjaro 7.5mg is available through NHS tier 3 specialist weight management services if you meet eligibility criteria (BMI ≥30 or BMI 27–29.9 with comorbidities). Access requires GP referral and assessment. Availability and waiting times vary significantly by region — contact your local weight management service for details.
How does 7.5mg Mounjaro compare to Wegovy at equivalent doses?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, whilst Wegovy (semaglutide) is GLP-1 only. At 7.5mg Mounjaro, weight loss in trials was approximately 16–17%, compared to Wegovy's maximum dose (2.4mg) showing approximately 15% average weight loss. Results vary individually — some people respond better to one medication than the other.
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.