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 Click Chart for UK Patients — Complete Dosing Guide
If you've been prescribed Mounjaro (tirzepatide) in the UK, understanding your click chart and dose schedule is essential. The Mounjaro KwikPen uses a click-based system to deliver your weekly injection, with doses starting at 2.5 mg and escalating to a maximum of 15 mg. This guide explains how the click chart works, what each dose means for your weight management journey, and how it fits within the NHS and UK private prescribing framework. Use our free BMI calculator above to check your baseline weight before starting 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 Doses Work — Click Chart Explained
Mounjaro is delivered via a pre-filled KwikPen device that uses a click mechanism to dispense your dose. Each click represents a specific microgramme amount. The UK prescribing schedule follows a gradual escalation:
- Weeks 1–4: 2.5 mg (starting dose)
- Weeks 5–8: 5 mg (first escalation)
- Weeks 9–12: 7.5 mg (second escalation)
- Weeks 13–16: 10 mg (third escalation)
- Weeks 17–20: 12.5 mg (fourth escalation)
- Weeks 21+: 15 mg (maximum maintenance dose)
Each pen contains four weeks of doses. Your prescriber may recommend staying at a lower dose if you experience side effects, or escalating faster if tolerated. The click chart on your pen packaging shows exactly which clicks correspond to each dose—always check your pen before injecting to ensure you're using the correct dose.
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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.
NHS Eligibility & UK Prescribing Routes
In the UK, Mounjaro is available through both NHS specialist services and private prescribing. NHS access is through tier 3 or 4 specialist weight management services, typically requiring referral from your GP. NICE has approved tirzepatide for weight management, though regional availability varies significantly. Private prescribing is available through GPhC-registered online prescribers following a clinical assessment. Whichever route you use, you'll need a valid prescription from a UK-licensed prescriber. Track your weight loss progress alongside your dose escalation using our free progress tracker—it helps you and your prescriber assess how well the medication is working at each dose level.
- 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.
What do the clicks on a Mounjaro KwikPen mean?
Each click on the KwikPen dial represents a specific dose amount. Your pen's packaging includes a click chart showing which number of clicks equals your prescribed dose (2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, or 15mg). Always check this before injecting to ensure accuracy.
How long do I stay on each Mounjaro dose?
UK prescribing guidance recommends a minimum of 4 weeks at each dose level before escalating. However, your prescriber may recommend staying longer at any dose if you're experiencing side effects, or progressing faster if well tolerated. Individual responses vary significantly.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is approved by NICE for NHS weight management services. Access is through specialist tier 3 or 4 services, typically via GP referral. However, availability and waiting times vary by region and local commissioning. Private prescribing is also available through GPhC-registered online providers.
What's the difference between the Mounjaro click chart and the dose schedule?
The click chart shows the mechanical setting on your pen (how many clicks to dial) for each dose. The dose schedule tells you when to escalate (e.g., stay on 2.5mg for weeks 1–4). You need both: the schedule tells you *when* to increase, and the click chart tells you *how* to set your pen correctly.
How does Mounjaro compare to Wegovy on the UK market?
Mounjaro (tirzepatide) is a dual GIP+GLP-1 receptor agonist; Wegovy (semaglutide) is a GLP-1 agonist only. Clinical trial data suggests Mounjaro may produce slightly higher average weight loss, but individual results vary. Both require prescription and clinical assessment. Our GLP-1 weight loss calculator can help estimate potential outcomes at different doses.
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.