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
Free tracker included with every download this week
What Is 7.5 Mg Mounjaro?
7.5 mg is an escalation dose of Mounjaro (tirzepatide), a prescription-only weight management injection licensed in the UK. At this dose, tirzepatide activates both GIP and GLP-1 hormone pathways, potentially supporting appetite regulation and weight management alongside diet and exercise. It's typically reached after 8–12 weeks of gradual dose titration. Individual results vary significantly, and this dose requires a prescription from a UK-licensed prescriber following a clinical assessment. Our GLP-1 weight loss calculator can help you explore potential outcomes at different Mounjaro doses.
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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 7.5 Mg Mounjaro Works
At 7.5 mg, Mounjaro operates as a dual GIP and GLP-1 receptor agonist. This dual mechanism distinguishes it from single-action GLP-1 medications like Wegovy (semaglutide). The 7.5 mg dose activates both pathways simultaneously, which may help:
- Reduce appetite and food cravings more effectively than single-action GLP-1 medications
- Support feeling fuller after smaller meals
- Slow gastric emptying (how quickly food leaves your stomach)
- Regulate blood sugar and fat utilisation
Clinical trial data shows that users on tirzepatide at higher doses (10–15 mg) achieved average weight loss of 19.5–20.9% of body weight over 72 weeks. The 7.5 mg dose typically produces results between the 5 mg baseline (~15% loss) and maximum doses, though individual responses vary considerably. This dose is often used as a stepping stone during dose titration before moving to 10 mg or higher.
Clinically BackedWeight Loss
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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.
7.5 Mg Mounjaro Dose Schedule & Side Effects
At 7.5 mg, Mounjaro is injected once weekly using a pre-filled KwikPen device. Most users reach this dose after 12 weeks of escalation (2.5 mg for 4 weeks, 5 mg for 4 weeks, 7.5 mg for 4 weeks). Common side effects at this dose include nausea, diarrhoea, constipation, and reduced appetite — typically mild and transient. Serious side effects are rare but may include severe stomach pain (possible pancreatitis) or gallbladder issues. Your prescriber will monitor you regularly. Use our BMI calculator to track how your weight relates to your health goals as you progress through your Mounjaro treatment journey.
- 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 7.5 mg Mounjaro the maximum dose?
No. 7.5 mg is an escalation dose. The maximum licensed dose is 15 mg once weekly. Most users stay on 7.5 mg for several weeks before increasing further, depending on their response and how well they tolerate it. Your prescriber decides whether to escalate based on your individual progress.
How much weight can I expect to lose on 7.5 mg?
Individual results vary significantly. Clinical trials suggest tirzepatide users lose between 15–21% of body weight at higher doses, but 7.5 mg typically produces results in the mid-range. Actual weight loss depends on your diet, activity level, starting weight, metabolism, and how your body responds to the medication.
Can I access 7.5 mg Mounjaro on the NHS in the UK?
NHS access is limited and varies by region. Most NHS weight management services operate in tier 3 and have long waiting lists. Private online prescribers can assess you and prescribe Mounjaro without NHS referral if you're eligible, following a clinical consultation.
How does 7.5 mg Mounjaro compare to Wegovy?
Mounjaro uses a dual GIP+GLP-1 mechanism (vs Wegovy's single GLP-1 action), and clinical trials suggest slightly higher average weight loss. However, Wegovy (semaglutide) is also licensed for weight management in the UK. Both require prescriptions. Individual response varies — some people respond better to one than the other.
What happens if I miss my 7.5 mg injection?
If you miss your injection, take it within 4 days of the scheduled date and continue your normal weekly schedule. If more than 4 days have passed, skip that dose and take your next dose on the normally scheduled day. Never take a double dose. Always contact your prescriber if you're unsure.
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.