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 5mg Click Chart — What You Need to Know
The Mounjaro click chart is the visual dosing guide printed on your KwikPen pre-filled injection device. At 5mg, this is typically your first maintenance dose after the starting 2.5mg week. Each click delivers a precise amount of tirzepatide. Understanding your click chart helps you take the correct dose safely and confidently. This guide explains how the 5mg Mounjaro click chart works and what to expect at this stage of treatment in the UK.
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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 Mounjaro 5mg Click Chart Works
The Mounjaro KwikPen has a click counter on the injection dial that shows you exactly which dose setting you're on. The click chart printed on your pen shows the progression: starting at 2.5mg (weeks 1–4), then moving to 5mg (weeks 5 onwards). At 5mg, you'll dial to the number marked on your pen and hear a distinct click — this indicates the pen is set correctly. Each KwikPen contains four pre-filled doses (a 4-week supply). The 5mg dose is injected once weekly, always on the same day each week. The pen displays the number of clicks clearly so you cannot accidentally deliver the wrong dose.
- Dial to the 5mg marking shown on your specific pen
- You will hear and feel a click when the correct dose is set
- Inject once weekly, same day each time
- Check your pen instructions before every injection
- Store unused pens in the fridge at 2–8°C
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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
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What to Expect at the 5mg Dose
The 5mg dose is your first maintenance dose after the initial 2.5mg starting dose. At this stage, tirzepatide is working on both GIP and GLP-1 receptors to help regulate appetite and blood sugar. Side effects like nausea, which may have been noticeable at 2.5mg, often improve as your body adjusts. You should spend a minimum of 4 weeks on 5mg before your prescriber considers increasing to 7.5mg — this allows your body to adapt fully. Clinical trials showed that weight loss begins to become noticeable around weeks 8–12 of treatment. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, and track your progress with 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.
How many clicks is the Mounjaro 5mg dose?
The number of clicks varies depending on your individual KwikPen — it's printed on the pen itself. Check your click chart before each injection. Never guess the number of clicks; always follow your pen's printed guide. If you're unsure, contact your prescriber.
Can I stay on Mounjaro 5mg indefinitely?
Your prescriber will assess after 4 weeks whether to increase your dose. Some people stay on 5mg if it's effective and well-tolerated. Others progress to higher doses for greater effect. This is a personal decision made with your prescriber based on your response and goals.
What if I'm not losing weight on the 5mg dose?
Weight loss varies. At 5mg, you're still in the early phase. Many people see more significant results at higher doses (10mg and above). If progress is minimal after 8–12 weeks, discuss with your prescriber about increasing. Remember to combine injection therapy with a reduced-calorie diet and physical activity for best results.
Is the 5mg Mounjaro dose available on the NHS in the UK?
Mounjaro is available through NHS specialist tier 3 weight management services in some areas, though availability and waiting lists vary significantly by region. Private prescribing is also available through UK-licensed online prescribers. Your GP can advise on NHS access in your area.
What's the difference between Mounjaro 5mg and Wegovy at equivalent doses?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. At 5mg Mounjaro, you're on your first maintenance dose; Wegovy's highest dose is 2.4mg. Clinical trials suggest Mounjaro may produce slightly greater weight loss, but individual results vary significantly.
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.