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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What Is 7.5mg Mounjaro and How Does It Work?
7.5mg is an escalation dose of Mounjaro (tirzepatide), a prescription-only weight loss injection licensed in the UK. At this dose level, you're typically moving beyond the initial starting phase into a maintenance or further adjustment stage. Mounjaro works as a dual GIP and GLP-1 receptor agonist, meaning it activates two natural hormone pathways to help regulate appetite and support feeling fuller after meals. This is different from single-action GLP-1 medications like Wegovy. Individual results vary significantly, and this dose is part of a structured titration schedule managed by your prescriber.
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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.
7.5mg Mounjaro Dose — Timing and Escalation in Your Treatment Plan
7.5mg is typically reached after 12 weeks of Mounjaro treatment on the standard dose escalation schedule. Your prescriber will assess your response at each dose level before increasing. The typical progression is: 2.5mg for weeks 1–4, 5mg for weeks 5–8, 7.5mg for weeks 9–12, then 10mg, 12.5mg, and finally 15mg (the maximum dose) if needed.
At 7.5mg, you should be experiencing the full effects of the dual GIP/GLP-1 mechanism. Clinical data from the SURMOUNT trials showed that participants on higher doses of tirzepatide achieved average weight loss of around 19.5% to 20.9% of their body weight over 72 weeks, though this was achieved alongside reduced-calorie diet and increased physical activity. Your individual results will depend on your adherence to lifestyle changes, metabolism, and how your body responds to the medication.
Each injection is given once weekly using the pre-filled KwikPen device, rotating injection sites between your stomach, upper thigh, or upper arm.
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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.
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Everything you need to understand your weight, explore medication options, and track your progress — completely free.
What to Expect at 7.5mg — Side Effects and Management
Common side effects at 7.5mg include nausea, diarrhoea, constipation, and stomach pain—these may be more pronounced than at lower doses as your body adjusts to higher concentrations of tirzepatide. Most people experience side effects that improve over time, though some persist. Eating smaller, lower-fat meals often helps reduce gastrointestinal symptoms.
At this dose level, you may also notice increased appetite suppression and more pronounced effects on food cravings. If you experience severe or persistent stomach pain, vomiting, or signs of pancreatitis (pain radiating to your back), contact your GP immediately. Use our free BMI calculator above to track your progress, and our GLP-1 weight loss calculator can help you project potential outcomes at this and higher doses.
- 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 an effective dose for weight loss?
Yes, 7.5mg is an active therapeutic dose showing meaningful weight loss in clinical trials. However, effectiveness varies between individuals. Some people continue escalating to higher doses (10mg, 12.5mg, or 15mg) for greater effect, while others see good results at 7.5mg. Your prescriber will assess whether to increase further based on your response and tolerance.
How long does it take to reach 7.5mg Mounjaro?
Following the standard NHS and private prescribing protocols, you typically reach 7.5mg after 12 weeks of treatment. This allows your body to adjust gradually at each dose level: 2.5mg (weeks 1–4), 5mg (weeks 5–8), then 7.5mg (weeks 9–12). Your prescriber may adjust this timeline based on your individual response.
What's the difference between 7.5mg Mounjaro and Wegovy at similar dose levels?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1-only agonist. The approximate equivalent Wegovy dose to 7.5mg Mounjaro is around 1.7mg, though they work through different mechanisms. Clinical trials suggest tirzepatide may produce slightly greater average weight loss, but individual results vary considerably.
Can I get 7.5mg Mounjaro on the NHS in the UK?
Mounjaro is available through NHS specialist tier 3/4 weight management services in some areas, but access varies significantly by region and ICB (Integrated Care Board). Waiting lists can be very long. Many people access it privately through GPhC-registered online prescribing services following a clinical assessment without NHS referral.
What should I do if I experience severe side effects at 7.5mg Mounjaro?
Contact your GP or prescriber immediately if you develop severe stomach pain, persistent vomiting, signs of pancreatitis, or serious allergic reactions. For manageable side effects like mild nausea or constipation, discuss them with your prescriber—they may recommend dose adjustments, temporary pausing, or dietary changes rather than stopping completely.
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