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 — What You Need to Know
Mounjaro 7.5mg is an escalation dose of the prescription weight loss injection tirzepatide, typically used after 8–12 weeks of treatment at lower doses. This dose sits in the middle of the full dose range available in the UK, where Mounjaro starts at 2.5mg and escalates weekly up to a maximum of 15mg. If you're considering this dose or your prescriber has suggested it, understanding how it fits into your treatment plan is important. Use our free BMI calculator to assess your current weight status and our GLP-1 weight loss calculator to explore potential outcomes with Mounjaro treatment.
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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.
How Mounjaro 7.5mg Fits Into Your Treatment Plan
Mounjaro works through a dual GIP and GLP-1 receptor agonist mechanism — meaning it activates two natural hormone pathways that regulate appetite and satiety. At 7.5mg, you're typically at an escalation stage where your body has adjusted to the initial doses, and your prescriber may be assessing your tolerance and response.
- Timing: 7.5mg is usually reached around weeks 9–12 of treatment, after 4 weeks each on 2.5mg, 5mg, and advancing to this dose
- Dose schedule: One injection per week, administered on the same day each week using a KwikPen
- Clinical trial context: In SURMOUNT-1 trials, participants at intermediate doses showed steady weight loss progression, with average losses of 15–19.5% body weight across the dose range
- Individual variation: Response at 7.5mg varies significantly — some people experience meaningful appetite reduction, while others may escalate further to 10mg or 12.5mg for optimal effect
Your prescriber will monitor your response and may continue at 7.5mg if it's working well, or escalate further depending on your tolerability and weight loss goals.
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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.
Side Effects and Practical Considerations at 7.5mg
At 7.5mg, the most common side effects remain nausea, diarrhoea, vomiting, and constipation — though many people find these ease as their body adjusts. Stomach discomfort and acid reflux may occur. By this stage of treatment, most people report that gastrointestinal symptoms are either mild or manageable through dietary adjustments.
Storage and administration: Keep your KwikPen refrigerated at 2–8°C until first use, then store at room temperature (below 30°C) for up to 30 days. Rotate injection sites weekly between your stomach, upper thigh, or upper arm. If you miss a dose, inject within 4 days of the scheduled date; beyond that, skip and resume your normal schedule. Track your weight loss progress using our free progress tracker.
- 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.
When would a prescriber suggest increasing to Mounjaro 7.5mg?
Typically after 4 weeks at 5mg, if you've tolerated it well and your prescriber believes further escalation is appropriate. They assess your weight loss response, side effects, and overall tolerability. Some people remain at 5mg if it's working effectively.
What's the difference between Mounjaro 7.5mg and Wegovy at equivalent doses?
Mounjaro is a dual GIP and GLP-1 agonist; Wegovy is GLP-1 only. Mounjaro 7.5mg is roughly equivalent to Wegovy 1mg in terms of dose escalation timing. Clinical trials show Mounjaro may deliver slightly higher average weight loss, but individual results vary significantly.
How long should I stay on 7.5mg before escalating?
Your prescriber will advise, but the standard guidance is a minimum of 4 weeks on each dose. This allows your body to adjust and gives time to assess whether further escalation is needed for your weight loss goals.
Can I get Mounjaro 7.5mg through the NHS?
Access is through NHS specialist tier 3 weight management services, though availability and waiting times vary significantly by region. Private access through online prescribing is also available following a clinical assessment with a UK-licensed prescriber.
What should I do if I experience significant side effects at 7.5mg?
Contact your prescriber immediately. They may reduce you back to 5mg, adjust your diet, or recommend other support. Severe stomach pain, signs of allergic reaction, or vision changes require urgent medical attention — contact NHS 111 or A&E.
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.