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 Tracker App — NHS UK Prescription Guide
Tracking your Mounjaro progress is an important part of your weight management journey if you're prescribed this tirzepatide injection through NHS specialist services or privately in the UK. While Mounjaro itself is administered once weekly via the KwikPen auto-injector, monitoring your weight, dose schedule, and side effects helps you and your prescriber assess how well the medication is working for you. This guide explains NHS access to Mounjaro, how to track your progress effectively, and the practical tools available to support your journey.
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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.
NHS Access and Eligibility for Mounjaro in the UK
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through two main routes. The NHS provides access via tier 3 specialist weight management services following referral from your GP. Eligibility typically requires a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower thresholds apply (BMI 27.5+). Alternatively, private access is available through GPhC-registered online prescribers following a clinical assessment. MHRA (Medicines and Healthcare products Regulatory Authority) approved tirzepatide for weight management, and NICE has recommended it for use within NHS specialist services. Doses escalate from 2.5 mg to a maximum of 15 mg once weekly, with dose adjustments every 4 weeks based on tolerability and weight loss response.
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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.
Tracking Your Mounjaro Progress — Practical Approaches
Effective progress tracking involves recording your weekly injection schedule, body weight, and any side effects you experience. Many patients benefit from using a simple spreadsheet or dedicated health app to log injection dates, weight measurements (in stone and lbs or kg), and notes on appetite changes, nausea, or other effects. Our free progress tracker can help you log weekly weigh-ins and visualise your weight loss trend over time. Your prescriber will monitor your progress at regular clinical reviews — typically before dose increases. Between appointments, track whether you're experiencing expected effects like reduced appetite or early satiety (feeling full quickly). Also note any side effects and their severity, as this helps your prescriber decide whether to escalate your dose or maintain your current level. Keeping a simple record means you have clear data to discuss with your GP or specialist at your next appointment.
- 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.
Can I track Mounjaro doses on the NHS?
Yes. NHS specialist weight management services will keep clinical records of your Mounjaro doses and weight loss progress. Your GP can also access these records. Between NHS appointments, you can keep your own personal log of injection dates, weights, and side effects using a simple spreadsheet or health app. This supports better discussions with your prescriber.
What should I record when tracking Mounjaro?
Record your weekly injection date, current body weight (in stone and lbs for UK measurements), appetite changes, any side effects (nausea, diarrhoea, constipation, stomach pain), how you're feeling, and any changes in energy levels. This helps your prescriber assess whether your dose should be increased at your next review (every 4 weeks minimum).
How often does the NHS review Mounjaro treatment?
NHS specialist services typically review your progress every 4 weeks minimum before dose escalation, and then at regular intervals during maintenance. Review frequency depends on your local tier 3 service. Private prescribers also arrange regular follow-ups. Always attend scheduled appointments so your prescriber can assess your tolerability and weight loss.
Is there an official NHS Mounjaro tracking app?
There is no single official NHS app for Mounjaro tracking. However, the NHS provides weight loss support resources through NHS Digital, and many patients use generic health apps, spreadsheets, or our free progress tracker to log their weekly weights and monitor trends alongside their prescribed treatment.
What's the difference between tracking Mounjaro on NHS vs private prescription?
NHS specialist services provide clinical monitoring and record-keeping as part of your treatment pathway. Private prescribers arrange their own follow-up consultations (usually remote) and may also provide digital tools. Either way, keeping your own personal log of weights, doses, and side effects is helpful for all consultations.
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.