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 the 7.5mg Mounjaro Dose?
The 7.5mg dose is the second escalation step in Mounjaro treatment, typically reached around week 9–12 of your weight management plan. At this dose, tirzepatide (the active ingredient in Mounjaro) activates dual GIP and GLP-1 hormone pathways more strongly than at the starting 2.5mg or maintenance 5mg doses. This is a prescription-only injection licensed in the UK for adults with obesity or overweight with weight-related health conditions. Individual responses vary significantly — some people may find this dose optimal for their needs, while others continue escalating to higher doses. Use our free GLP-1 weight loss calculator to explore potential outcomes at different dose levels.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 the 7.5mg Dose Works in Your Treatment Plan
In the standard Mounjaro dose escalation schedule used in the UK, you'll typically reach 7.5mg around week 9–12 after starting at 2.5mg. Your prescriber will assess your response at each 4-week interval before increasing. At 7.5mg, the dual GIP and GLP-1 receptor activation may help further reduce appetite, support feeling fuller after smaller meals, and assist with managing food cravings. This intermediate dose sits between the 5mg maintenance dose and the 10mg escalation — some people find their optimal balance here, while others progress further.
Important: Mounjaro is always used alongside a reduced-calorie diet and increased physical activity. The injection alone does not cause weight loss — lifestyle changes are essential for results.
- Dual mechanism: activates both GIP and GLP-1 pathways
- Once-weekly injection using the KwikPen device
- Requires ongoing clinical monitoring by your prescriber
- Each increase requires at least 4 weeks at the previous dose
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 What to Expect at 7.5mg
At 7.5mg, gastrointestinal side effects remain the most common — nausea, diarrhoea, constipation, and stomach discomfort may occur. These typically improve as your body adjusts over days or weeks. Some people experience reduced side effects at higher doses as the gut adapts, whilst others find lower doses more tolerable.
Seek urgent medical attention if you experience: severe persistent stomach pain (possible pancreatitis), serious allergic reactions, gallbladder problems, or significant changes in heart rate. Always contact your GP or prescriber if side effects are severe or persistent. Using our free progress tracker can help you log side effects and weight changes, making conversations with your prescriber more productive.
- 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.
How long do I stay on 7.5mg Mounjaro before increasing further?
Your prescriber will assess your response after at least 4 weeks at 7.5mg. If weight loss is progressing well and side effects are manageable, you may continue at this dose or escalate to 10mg. The goal is finding the lowest effective dose for your individual needs — higher is not always better.
Is 7.5mg Mounjaro available on the NHS in the UK?
Mounjaro (tirzepatide) is approved by NICE for NHS specialist weight management services, but availability varies significantly by region and NHS ICB. NHS access typically requires referral to a tier 3 specialist service. Private prescription through online assessment is an alternative route available without NHS referral.
What's the difference between 7.5mg Mounjaro and 7.5mg Wegovy?
This is a common source of confusion — Wegovy (semaglutide) has a maximum dose of 2.4mg, so there is no 7.5mg Wegovy. Mounjaro (tirzepatide) is a different medication with a dual GIP+GLP-1 mechanism, whereas Wegovy uses GLP-1 alone. Clinical trial data suggests different weight loss profiles between the two.
Can I use the BMI calculator to check if I'm eligible for 7.5mg Mounjaro?
Yes — our free BMI calculator helps you understand your current BMI category. Generally, UK eligibility starts at BMI 30 or above, or BMI 27+ with weight-related conditions like type 2 diabetes or high blood pressure. However, only a qualified prescriber can assess true eligibility based on your full health picture.
What weight loss might I expect by the time I reach 7.5mg?
Individual results vary — clinical trials (SURMOUNT-1) showed average weight loss of approximately 15–21% body weight across all doses. Progress by week 9–12 depends on your starting dose, your body's individual response, dietary adherence, and physical activity. Use our GLP-1 weight loss calculator for personalised projections, but remember: these are averages, and your outcome may differ.
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.