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
How Many Clicks in a 10mg Mounjaro Pen?
Each 10mg dose of Mounjaro (tirzepatide) requires exactly 2 clicks on the KwikPen device to deliver the full medication. This is an important detail for anyone prescribed this weight management injection in the UK. Understanding how to use the Mounjaro KwikPen correctly ensures you receive the exact dose your GP or prescriber has recommended. The pen is pre-filled and designed to deliver precise doses, making the injection process straightforward for most users.
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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.
Understanding Mounjaro Dose Delivery and the KwikPen Device
The Mounjaro KwikPen is a pre-filled injection device that administers tirzepatide once weekly. Each pen contains 4 weeks' worth of doses. For the 10mg dose, you will perform exactly 2 clicks to deliver the full injection. The first click primes the needle, and the second click releases the medication. This straightforward two-click mechanism applies to all 10mg pens, regardless of whether you're accessing Mounjaro through NHS specialist weight management services or via private prescription.
The KwikPen is designed to be user-friendly, with an audible click and visible dose indicator to confirm delivery. After injecting, hold the pen in place for 3 seconds to ensure the full dose is administered. Common injection sites include the stomach, upper thigh, or upper arm — rotate sites each week to minimise irritation. If you're unsure about your technique, ask your prescriber or pharmacist to demonstrate the injection before your first 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.
Mounjaro Dose Titration and NHS Prescribing Context
Mounjaro dose titration in the UK starts at 2.5mg and increases every 4 weeks if tolerated. The 10mg dose is typically reached around week 13 of treatment. NHS NICE guidance approves tirzepatide for use in specialist tier 3 weight management services for adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions. The number of clicks remains consistent for the 10mg dose whether prescribed privately or through NHS services — always 2 clicks. Weight loss at the 10mg dose varies individually; clinical trials showed average weight loss of approximately 19.5% of body weight at this dose level alongside a reduced-calorie diet and physical activity. Individual responses differ significantly.
- 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.
Why is it important to know the exact number of clicks for my Mounjaro dose?
Knowing the correct number of clicks ensures you receive the precise dose prescribed by your healthcare provider. For 10mg, 2 clicks confirms full delivery. This is essential for safety and effectiveness. If you're unsure you've completed the full injection, always contact your pharmacist or GP.
Do all Mounjaro pens have the same click mechanism?
Yes, all Mounjaro KwikPens use the same two-step click mechanism. The number of clicks varies by dose strength — lower doses may require fewer clicks — but the 10mg dose always requires exactly 2 clicks for full delivery.
What should I do if I'm unsure whether I've completed the full 10mg injection?
If you think you may have missed clicks or are uncertain, contact your pharmacist or GP immediately. Do not attempt another injection the same day. Your prescriber can advise on whether to wait for your next scheduled dose or if an alternative approach is needed.
How does Mounjaro dosing on the NHS differ from private prescriptions?
The dosing schedule and click mechanism are identical whether prescribed through NHS tier 3 weight management services or privately. The main differences are route of access, waiting times, and cost. NHS access typically requires specialist referral, whilst private access is available through online consultation with a licensed prescriber.
Can I use our free GLP-1 weight loss calculator to estimate results at the 10mg dose?
Yes, our free weight loss calculator on this page can help you project potential weight loss outcomes at different Mounjaro doses, including 10mg. Remember that individual results vary based on diet, activity level, and personal metabolism. Use it as a reference tool alongside guidance from your healthcare provider.
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.