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 Weight Tracker: UK Cost and Access Guide
If you're considering Mounjaro (tirzepatide) as a weekly weight loss injection in the UK, understanding how to access it and what it costs is essential. Mounjaro is prescription-only and available through two routes: NHS specialist weight management services or private prescribing through UK-registered pharmacies. This guide covers eligibility, costs, and the access pathway to help you make an informed decision.
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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.
Private Access Costs and NHS Route Explained
Private access to Mounjaro is available through online consultations with UK-licensed prescribers, typically costing £129–£320 monthly depending on your dose. The 2.5 mg starting dose sits at the lower end, while higher maintenance doses (10–15 mg) cost more. Costs usually include the online consultation, clinical assessment, and prescription. You can track your progress using our GLP-1 weight loss calculator to estimate potential outcomes at different doses.
- Starting dose (2.5 mg): approximately £129–£160/month
- Mid-range dose (5–7.5 mg): approximately £180–£240/month
- Maintenance dose (10–15 mg): approximately £260–£320/month
NHS access requires referral to a tier 3 specialist weight management service through your GP. If approved and available in your area, NHS Mounjaro would be provided at no direct cost (prescription charge applies if eligible). However, NHS availability is extremely limited and varies significantly by region; many areas have waiting lists of several months to over a year.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
How to Access and What to Expect
To access Mounjaro privately, you'll complete an online health questionnaire and video or telephone consultation with a UK-licensed prescriber. They'll assess your BMI, health conditions, and medication history to confirm suitability. If approved, your prescription is sent to a GPhC-registered pharmacy for dispensing. The entire process typically takes 1–3 working days from consultation to receiving your KwikPen. You'll inject once weekly into your abdomen, thigh, or upper arm. Use our free BMI calculator to check if your current weight meets typical eligibility criteria (BMI 30+, or 27+ with weight-related health conditions), and track your weekly injections and weight changes with our progress tracker.
NHS route: Ask your GP for referral to your local tier 3 weight management service. They'll assess you against NHS criteria and discuss options including GLP-1 injections if available. Private route: Book an online consultation directly with a UK prescriber. You'll need to provide accurate health information, current medications, and medical history. Prescribers cannot legally issue prescriptions for anyone under 18, pregnant, or breastfeeding. Once your prescription is issued and dispensed, you'll receive your medication with full instructions on injection technique, storage (refrigerate unopened pens at 2–8°C), and when to seek medical advice.
- 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 available on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is approved by NICE for use within NHS tier 3 specialist weight management services. However, availability is extremely limited and regional. Most areas have waiting lists of many months. Your GP can refer you to your local service, but NHS access is not assured. Private prescription routes are faster.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs range from approximately £129–£320 per month depending on your dose. Starting dose (2.5 mg) is cheapest; maintenance doses (10–15 mg) are more expensive. This typically includes the online consultation, clinical assessment, prescription, and dispensing. Prices vary between providers.
What happens during an online Mounjaro consultation?
You'll complete a health questionnaire and have a video or telephone consultation with a UK-licensed prescriber. They'll review your weight, BMI, medical history, and current medications to assess suitability. If approved, they issue a prescription to a GPhC-registered pharmacy. The entire process takes 1–3 working days from consultation to receiving your injection.
Can I get Mounjaro on prescription without seeing my GP?
Yes. You can access Mounjaro privately via online consultation with a UK-registered prescriber without GP referral. However, if you prefer the NHS route, your GP must refer you to a tier 3 weight management service. Private access is faster; NHS access is free but availability varies greatly by region.
Do I need to repeat consultations when I reorder Mounjaro?
Yes. Most private prescribing services require periodic follow-up consultations (typically monthly) to monitor your progress, side effects, and dose suitability. This is a safety requirement and cost is usually included in your monthly fee. Your prescriber may also request blood pressure or weight checks.
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.