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
Mounjaro Injection For Diabetes — UK Access & Cost Guide
Mounjaro (tirzepatide) is a prescription-only weekly injection that can help manage blood sugar levels and support weight loss in adults with type 2 diabetes or prediabetes. In the UK, you can access Mounjaro through NHS specialist services or privately following a clinical assessment. Costs, eligibility, and waiting times vary significantly depending on your route. This guide explains how to get Mounjaro, what it costs, and what to expect at each stage. Our GLP-1 weight loss calculator can help you estimate potential outcomes with Mounjaro therapy.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Mounjaro Cost And Access Routes In The UK
NHS Access: Mounjaro is approved by NICE for use within NHS specialist weight management services. Access is through tier 3 or 4 multidisciplinary weight management clinics, typically after referral from your GP. You do not pay prescription charges once prescribed through the NHS — though this is not assured access everywhere. NHS availability varies significantly by region (integrated care board), and waiting lists can exceed 12–18 months in many areas. Your GP can advise whether your local NHS service offers Mounjaro or if you meet tier 3 criteria.
Private Access: Available through GPhC-registered online prescribing services following an online clinical consultation. A UK-licensed prescriber assesses your eligibility and issues a prescription if appropriate. Private costs typically range from £129–£320 per month depending on dose and provider. A KwikPen device contains 4 weekly doses (one month supply). Private access does not require NHS referral and offers faster access — often within days rather than months. Our free BMI calculator above can help confirm whether you may be eligible.
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.
NHS Versus Private — Which Route Is Right For You?
NHS route is free at point of prescription but requires GP referral, specialist assessment, and may involve significant waiting times. Best if you prefer NHS-supervised care and can wait. Private route costs £129–£320/month but requires payment, involves an online consultation with a licensed prescriber (usually same day or within 48 hours), and offers rapid access. Your prescriber will assess your weight, medical history, current medications, and health conditions to determine suitability. Both routes require you to commit to lifestyle changes alongside medication. Once prescribed, your GP can support ongoing monitoring. Use our GLP-1 weight loss calculator to explore potential dose and weight loss context before consulting a prescriber.
- 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 for diabetes?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use in specialist weight management services. However, availability varies by region and waiting times can be lengthy. Your GP can refer you to your local NHS tier 3 service, but access is not assured everywhere in the UK.
How much does Mounjaro cost privately in the UK?
Private Mounjaro typically costs £129–£320 per month depending on dose and provider. Each KwikPen contains 4 weekly doses. Costs increase as you titrate to higher doses (doses range from 2.5 mg to 15 mg). No pharmacy name recommendations — speak to a licensed prescriber during consultation.
How do I get a private prescription for Mounjaro in the UK?
Contact a GPhC-registered online prescribing service. Complete an online health questionnaire and consultation with a UK-licensed prescriber. If approved, the prescriber issues a prescription and coordinates delivery with a licensed pharmacy. Most consultations take 24–48 hours.
What's the difference between NHS and private Mounjaro access?
NHS is free but involves GP referral, specialist assessment, and potential waiting lists of months to years. Private is paid (£129–£320/month) but faster — usually within days. Both require clinical assessment; both need lifestyle changes alongside the injection.
Can my GP prescribe Mounjaro privately?
Your GP may be willing to support ongoing monitoring once a private prescriber has initiated Mounjaro, but most primary care does not initiate private weight loss prescriptions. Specialist online prescribers or private weight management clinics typically manage the initial prescription and dose adjustments.
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.