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 Weight Loss — What You Need to Know
The 7.5mg dose of Mounjaro (tirzepatide) is an escalation dose typically reached around week 9–12 of treatment. This dose sits in the middle of the available range and may offer increased appetite suppression compared to lower doses. Clinical evidence suggests adults on Mounjaro at various doses lost an average of 15–21% of their body weight when combined with dietary changes and increased physical activity. Individual results vary significantly. Your GP or a licensed prescriber can assess whether this dose is appropriate for your specific health situation following a clinical assessment.
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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.
How Mounjaro 7.5mg Works and What to Expect
Mounjaro is a dual GIP and GLP-1 receptor agonist — this dual mechanism is what distinguishes it from single GLP-1 injections like Wegovy. At the 7.5mg dose, both pathways are working to help regulate appetite and food intake.
The medication works by:
- Activating GIP and GLP-1 hormone receptors in the brain to reduce hunger signals
- Slowing gastric emptying so you feel fuller for longer after meals
- Supporting better blood sugar regulation
- Helping your body use fat more effectively
The 7.5mg dose represents the third escalation tier in the UK dosing schedule. Most people on Mounjaro spend at least 4 weeks on the 5mg dose before progressing to 7.5mg, then a further 4 weeks before considering escalation to 10mg or 15mg. Your prescriber will assess your response and tolerability at each stage.
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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.
7.5mg Mounjaro — Eligibility, Access, and Practical Information
To be eligible for Mounjaro in the UK, you generally need a BMI of 30 or above, or BMI 27–29.9 with a weight-related health condition such as type 2 diabetes, high blood pressure, or sleep apnoea. Adults of South Asian, Chinese, Black African, or Black Caribbean heritage may have lower BMI thresholds due to higher health risks at lower weights.
Mounjaro is prescription-only and available through NHS specialist weight management services or private online prescribing following a clinical assessment. Storage is straightforward: unopened pens stay in the fridge at 2–8°C, and after first use can be kept at room temperature for up to 30 days. Each KwikPen contains 4 weekly doses. Use our free GLP-1 weight loss calculator to explore potential outcomes, and our BMI calculator to check where you sit on the health spectrum.
- 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's the difference between Mounjaro 7.5mg and Wegovy at similar potency?
Mounjaro is a dual GIP+GLP-1 agonist; Wegovy (semaglutide) is GLP-1 only. The 7.5mg Mounjaro dose is roughly equivalent to Wegovy 1.7mg in terms of strength. Clinical trials show Mounjaro users lost slightly more weight on average, but individual results vary. Both are prescription-only and require clinical assessment.
How long does it take to reach the 7.5mg dose?
Mounjaro follows a standard escalation schedule. You start at 2.5mg (weeks 1–4), move to 5mg (weeks 5–8), then 7.5mg (weeks 9–12). You must spend at least 4 weeks on each dose before escalating. Some people stay on 7.5mg as their maintenance dose; others continue to 10mg, 12.5mg, or 15mg based on response.
Will I lose weight on the 7.5mg dose?
Clinical trials show Mounjaro users lost an average of 15–21% body weight across all doses, but individual results vary significantly. Weight loss depends on dose, adherence, diet quality, physical activity, and your personal metabolism. Your prescriber will monitor your progress and adjust dosing accordingly.
Can I get 7.5mg Mounjaro through the NHS?
Yes, Mounjaro is available through NHS specialist weight management services (tier 3), but availability varies by region and waiting lists can be long. Private access is available through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber.
What side effects are most common at 7.5mg?
Nausea, diarrhoea, constipation, and stomach discomfort are very common, especially during dose escalations. These typically ease within a few weeks. Less common side effects include headache, fatigue, and injection site reactions. Serious side effects are rare but include severe stomach pain (possible pancreatitis). Always report persistent or severe symptoms to your prescriber.
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.