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
What Is Mounjaro Kwikpen 10mg?
The Mounjaro Kwikpen 10mg is the fourth dose in the escalation schedule for tirzepatide weight management treatment in the UK. This 10mg dose is reached after 12–16 weeks on lower doses and represents a significant step up in the dual GIP and GLP-1 receptor agonist medication. At this dose level, most users experience more pronounced appetite suppression and fuller-feeling effects. The Kwikpen is a pre-filled, ready-to-use injection device that delivers exactly 10mg of tirzepatide once per week. It's prescription-only and requires ongoing clinical oversight from your healthcare provider.
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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 the 10mg Dose Fits Into Your Treatment Plan
The Mounjaro Kwikpen 10mg is typically reached after careful dose escalation over approximately three months. The standard titration follows this pattern: 2.5mg for weeks 1–4, 5mg for weeks 5–8, 7.5mg for weeks 9–12, then 10mg from week 13 onwards. Each dose increase allows your body to adjust to the medication and helps your healthcare provider monitor side effects and tolerability. At 10mg, many patients notice intensified satiety signals—meaning you feel fuller after smaller meals and have reduced cravings between meals. Clinical evidence suggests that tirzepatide at this dose level may support meaningful weight loss when combined with a reduced-calorie diet and increased physical activity. Your GP or prescriber will assess whether you should continue at 10mg or escalate further to 12.5mg or the maximum 15mg dose based on your individual response and tolerance.
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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.
What to Expect on the 10mg Dose
Most people tolerate the 10mg Kwikpen well, though gastrointestinal side effects like nausea, constipation, or diarrhoea may persist or intensify slightly during dose escalation. These typically improve within 24–48 hours after injection. You should continue to eat protein-rich, nutrient-dense foods despite reduced appetite—the medication doesn't change your nutritional needs. Many users find that using our free GLP-1 weight loss calculator helps visualise potential outcomes at different doses and tracks progress over weeks. Remember to rotate your injection site weekly (stomach, thigh, or upper arm) to prevent irritation, and store your Kwikpen in the fridge at 2–8°C when unopened. If you experience persistent nausea, severe stomach pain, or changes in vision, contact your GP immediately.
- 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 10mg the highest dose available?
No. The maximum licensed dose in the UK is 15mg once weekly. The dose escalation typically goes: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, and then 15mg. Your prescriber will assess whether you need to continue escalating based on your response and side effect tolerance.
How much weight loss can I expect on Mounjaro 10mg?
Clinical trials show tirzepatide produces average weight loss of around 19.5% of body weight at 10mg over 72 weeks, but individual results vary significantly. Weight loss depends on adherence to diet, physical activity, and your personal metabolism. Use the BMI calculator on this page to track your current starting point.
Can I stay on 10mg or do I have to go higher?
Yes, you can remain on 10mg indefinitely if you're tolerating it well and seeing good results. There's no requirement to escalate further. Your prescriber will discuss whether continuing at 10mg or escalating is right for your goals and health.
How do I store a Mounjaro Kwikpen 10mg?
Store unopened pens in the fridge at 2–8°C in the original carton. After first use, you can keep the pen at room temperature (below 30°C) for up to 30 days. Never freeze. Dispose of the pen after 30 days of use.
Is Mounjaro 10mg available on the NHS in the UK?
Mounjaro is available through NHS specialist tier 3/4 weight management services in some regions, though availability and waiting times vary significantly. Private prescribing is also available through UK-licensed online providers following a 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.