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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Understanding Mounjaro Chart Clicks and Dose Titration
"Mounjaro chart clicks" refers to the dose increments on the KwikPen pre-filled injection device. Each click corresponds to a specific tirzepatide dose, and understanding how the pen works is essential for safe use. This guide explains how Mounjaro injections are administered, the dose titration schedule, and what each click means for your treatment. Always follow your prescriber's instructions and the patient information leaflet when using your KwikPen.
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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 KwikPen and Dose Increments Work
The Mounjaro KwikPen is a pre-filled, single-use injection pen designed for once-weekly administration. The pen has a dose selector dial that clicks to align with your prescribed dose.
- Each KwikPen contains 4 weeks of treatment (4 injections at the same dose)
- The dose dial has clear markings to ensure you select the correct dose
- After injection, you press the injection button until it stops — this ensures the full dose is delivered
- Each pen is disposed of after use — do not reuse
- Doses available: 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg
Always check the label on your pen to confirm the dose strength before injecting. If you are unsure about your dose, contact your prescriber or pharmacist before using the pen.
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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.
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Mounjaro Dose Titration Schedule and What to Expect
Mounjaro follows a gradual dose titration schedule, meaning your dose increases over time. You typically start at 2.5 mg and stay on each dose for a minimum of 4 weeks before increasing.
- Weeks 1–4: 2.5 mg (one pen)
- Weeks 5–8: 5 mg (second pen)
- Weeks 9–12: 7.5 mg (third pen)
- Weeks 13–16: 10 mg (fourth pen)
- Weeks 17–20: 12.5 mg (fifth pen)
- Week 21+: 15 mg (maintenance dose)
Your prescriber may adjust this schedule based on your tolerability and response. Never increase your dose without guidance from your healthcare provider. Calculate your potential weight loss at different doses using our GLP-1 weight loss calculator.
Mounjaro works as a dual GIP and GLP-1 receptor agonist, activating two natural hormone pathways to help regulate appetite and support weight management. When injected under the skin, tirzepatide circulates in your bloodstream to exert these effects throughout the body.
- Injections are given once per week on the same day each week
- Common injection sites include the stomach (abdomen), upper thigh, or upper arm
- Rotate your injection site each week to prevent irritation
- Side effects like nausea are most common during the first few weeks and often improve over time
Clinical trials showed that participants on the maximum 15 mg dose lost approximately 20.9% of their body weight on average over 72 weeks, alongside a reduced-calorie diet and physical activity. Individual results vary significantly. Check your BMI using our free BMI calculator to understand your starting point.
- 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 does "mounjaro chart clicks" mean?
"Chart clicks" refers to the dose increments on the Mounjaro KwikPen. Each click of the dose selector dial corresponds to a specific tirzepatide dose (2.5 mg, 5 mg, 7.5 mg, etc.). The chart on the pen label shows you which dose to select, and you click the dial to align with your prescribed dose before injecting.
How many injections come in one Mounjaro pen?
Each KwikPen is pre-filled and contains 4 doses — one week's worth of treatment. After 4 weeks, you dispose of that pen and start a new one at the next dose level (unless your prescriber keeps you on the same dose). Never attempt to refill or reuse a KwikPen.
Can I adjust my Mounjaro dose myself?
No. Your prescriber determines your dose based on clinical assessment, tolerability, and your response. Do not increase or change your dose without explicit guidance from your GP or prescriber. Dose increases follow a strict titration schedule with minimum 4-week intervals.
What if I accidentally dial the wrong dose on my KwikPen?
If you have dialled the wrong dose, do not inject. Return the pen to room temperature, check the label and dose dial again, and if still uncertain, contact your pharmacist or prescriber. Never guess — using the correct dose is essential for safe treatment.
Is Mounjaro available on the NHS in the UK?
Mounjaro (tirzepatide) is NICE-approved and available through NHS specialist tier 3 weight management services. However, availability varies significantly by region, and waiting lists can be lengthy. Private prescribing is also available through UK-licensed online healthcare providers following clinical assessment.
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.