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 7.5 mg — UK Dose Information
Mounjaro 7.5 mg is the second escalation dose of tirzepatide, a prescription-only weight management injection licensed in the UK. This dose is typically reached around week 9–12 of treatment as part of a gradual dose titration schedule. At 7.5 mg, the medication's dual GIP and GLP-1 mechanisms are increasingly active, helping to regulate appetite and support weight loss alongside diet and physical activity. Individual responses vary significantly. Your GP or a licensed prescriber will assess whether this dose is appropriate for your personal health needs through 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 7.5 mg Works and Dose Progression
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — this dual mechanism is what distinguishes it from other weight loss injections like Wegovy. At 7.5 mg, the medication activates both the GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 (glucagon-like peptide-1) hormone pathways, which may help regulate appetite, reduce food cravings, and support feeling fuller after smaller meals.
The standard UK Mounjaro dose titration schedule is:
- Weeks 1–4: 2.5 mg (starting dose)
- Weeks 5–8: 5 mg (first maintenance)
- Weeks 9–12: 7.5 mg (second escalation)
- Weeks 13–16: 10 mg (further escalation if needed)
- Weeks 17–20: 12.5 mg
- Week 21+: 15 mg (maximum)
You remain on each dose for a minimum of 4 weeks before escalating. A prescription weight loss uk programme through NHS specialist services or a private prescriber will manage your individual progression based on your response and tolerability.
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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.
Expected Weight Loss and Side Effects at 7.5 mg
Clinical trial data (SURMOUNT-1) showed that at higher doses, Mounjaro supported significant weight loss — on average around clinically studied weight loss at 10 mg and 20.9% at 15 mg. At 7.5 mg, results are typically in the 15–18% range, though individual outcomes vary considerably. Weight loss is always achieved alongside a reduced-calorie diet and increased physical activity — the medication is not a standalone treatment.
Common side effects at 7.5 mg include nausea, diarrhoea, vomiting, and constipation. These typically improve over time as your body adjusts. Serious side effects are rare but may include severe stomach pain (possible pancreatitis) or allergic reactions — seek immediate medical attention if these occur. Use our GLP-1 weight loss calculator to estimate potential outcomes at different doses based on your starting weight.
- 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 Mounjaro 7.5 mg the maximum dose I can take?
No. 7.5 mg is an intermediate dose. After week 12, your prescriber may recommend escalating to 10 mg, 12.5 mg, or the maximum of 15 mg weekly — depending on your weight loss progress and side effect tolerance. Each dose increase happens gradually, with a minimum 4-week interval.
How long do I stay on Mounjaro 7.5 mg?
Typically, you remain on 7.5 mg for weeks 9–12 before your prescriber assesses whether to escalate further. However, if 7.5 mg is giving you good results and is well-tolerated, your prescriber may recommend staying on this dose longer — treatment is personalised to your individual needs.
Can I get Mounjaro 7.5 mg on the NHS?
Mounjaro is available through NHS specialist tier 3 weight management services in some regions, but availability varies significantly across ICBs. You would need referral from your GP and assessment by a specialist team. Alternatively, it's available privately through licensed prescribers following an online clinical assessment.
What's the difference between Mounjaro 7.5 mg and Wegovy at similar doses?
Mounjaro is a dual GIP and GLP-1 agonist; Wegovy (semaglutide) is GLP-1-only. Mounjaro's dual mechanism may offer different effects. Wegovy's maximum dose is 2.4 mg weekly (different scale). Direct comparison requires prescriber guidance — both require a UK prescription and clinical assessment.
What happens if I miss a 7.5 mg injection?
If you miss your 7.5 mg dose, inject within 4 days of the missed date and continue your normal schedule. If more than 4 days have passed, skip that dose and take your next injection on the normally scheduled day. Never take a double dose. Contact your prescriber if unsure.
Ready to take control of your weight loss journey?
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