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 for Diabetes in the UK — Cost and Access Guide
If you have type 2 diabetes or prediabetes and excess weight, Mounjaro (tirzepatide) may be an option to discuss with your healthcare team. This guide covers how to access Mounjaro in the UK through both NHS and private routes, what it costs, and the eligibility criteria that apply. Understanding your options helps you make an informed decision about whether this medication is right for you.
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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 to Access Mounjaro in the UK
NHS Route: Mounjaro can be prescribed through NHS specialist tier 3 and tier 4 weight management services, particularly for people with type 2 diabetes or prediabetes who also have obesity or overweight status. Access typically requires a GP referral to your local specialist weight management service. However, NHS availability varies significantly by region—some areas have lengthy waiting lists (often 6–18 months or longer), whilst others may have limited services available. NICE approved tirzepatide (Mounjaro) in 2024 for eligible adults, but provision remains inconsistent across integrated care boards.
Private Route: Mounjaro is available through UK-licensed private prescribers via online consultation, without needing an NHS referral. This route is faster—you can typically receive a prescription within 24–48 hours if assessed as suitable. Private prescriptions are dispensed by GPhC-registered pharmacies. This option requires payment and is not covered by the NHS, though costs vary depending on your starting dose.
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.
Private Cost and NHS vs Private Comparison
Private Mounjaro costs in the UK typically range from £129 to £320 per month, depending on your dose tier (starting doses like 2.5 mg are cheaper; maintenance doses like 15 mg are more expensive). Each KwikPen contains four weekly injections. Over a year, private treatment might cost £1,500–£3,800+. The NHS covers the full cost for eligible patients, but access depends on your region's commissioning decisions and waiting list capacity. Many people choose private access to avoid NHS waiting times. Use our free GLP-1 weight loss calculator to explore potential outcomes, and our BMI calculator to check whether you may qualify for either NHS or private treatment based on your current health metrics.
- 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.
Do I need NHS referral to get Mounjaro privately?
No. Private online prescribers can assess you independently without an NHS referral. You'll complete an online consultation, answer medical history questions, and a UK-licensed prescriber will decide if Mounjaro is suitable for you. If approved, your prescription goes to a GPhC-registered pharmacy for dispensing.
How long does it take to get Mounjaro on the NHS?
Waiting times vary by region. Some areas have waits of 6–18 months or longer for tier 3 services. A few regions with better capacity may be faster. Contact your local integrated care board or ask your GP about typical waiting times in your area.
Is Mounjaro expensive if I pay privately?
Private costs typically range from £129–£320 monthly depending on dose. Starting doses (2.5 mg) are cheaper than maintenance doses (15 mg). Over a year, expect £1,500–£3,800+. This is significantly more than NHS treatment, which is free to eligible patients, but faster access may justify the cost for some people.
Can I switch from Wegovy to Mounjaro in the UK?
Switching between medications should only be managed by your prescriber. If you're on Wegovy privately and want to try Mounjaro, discuss this with your prescriber or GP. Mounjaro uses a different dose titration schedule, so a prescriber must assess whether switching is safe and appropriate for you.
What if I can't afford private Mounjaro?
Consider joining the NHS waiting list through your GP or local weight management service—it's free but may involve a wait. Some GPs may consider other weight loss options (lifestyle support, lower-cost medications). Ask your GP about tier 2 community services or digital weight management programmes available in your area while waiting.
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.