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 5mg Injection — UK Cost and Access Guide
Mounjaro 5mg is the first maintenance dose of this prescription-only weight loss injection in the UK. Understanding the cost and how to access it—whether through the NHS or privately—helps you make an informed decision about weight management treatment. This guide covers UK pricing, eligibility, and the prescription process for the weekly weight loss injection.
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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 Cost and Access Routes in the UK
In the UK, a Mounjaro 5mg injection typically costs between £129 and £180 per month through private prescription routes, depending on the provider and whether you're purchasing individual pens or a month's supply. Each KwikPen contains four weekly injections (one month). Private access is available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber—you do not need an NHS referral. The online consultation process is straightforward: you complete a health questionnaire, a prescriber reviews your suitability, and if approved, your prescription is sent to a registered pharmacy for dispensing. This route offers faster access than NHS services, with many people receiving their first dose within 5–7 working days. Costs may vary slightly between providers, so it's worth comparing options. Using our free GLP-1 weight loss calculator can help you estimate potential outcomes at the 5mg dose before committing to treatment.
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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.
NHS vs Private Access for Mounjaro
The NHS has approved tirzepatide (Mounjaro) for use within specialist weight management services following NICE guidance. However, NHS access is typically limited to tier 3 specialist services rather than standard GP prescription. You will usually need referral from your GP to a regional weight management service, and waiting lists can extend several months to over a year in many areas depending on your local ICB (Integrated Care Board). Once approved, the NHS covers the full cost. Private access offers faster treatment initiation without waiting lists, though at personal cost. For those seeking quicker access to a weekly weight loss injection, the private route provides an alternative. Calculate your BMI using our free BMI calculator to check your eligibility threshold, then discuss options with your GP or a licensed 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.
How much does Mounjaro 5mg cost per month in the UK?
Private Mounjaro 5mg typically costs £129–£180 per month in the UK. Prices vary between GPhC-registered providers. Each KwikPen contains four weekly doses (one month's supply). NHS provision is free but requires specialist referral and may involve waiting lists.
Can I get Mounjaro 5mg on the NHS in the UK?
Yes, Mounjaro is approved for NHS use within tier 3 specialist weight management services. However, you need GP referral to a regional service and often face waiting lists of several months. Private prescription is faster but requires personal payment.
What is the online consultation process for Mounjaro?
Complete an online health questionnaire on a GPhC-registered pharmacy's website. A UK-licensed prescriber reviews your answers and medical history. If approved, they issue a prescription sent to the pharmacy. Dispensing typically happens within 5–7 working days, with delivery to your home.
Is Mounjaro 5mg more expensive than other weight loss injections?
Mounjaro 5mg costs are broadly comparable to Wegovy (semaglutide) in the UK, typically £129–£180 per month. Exact pricing depends on the provider. Use our GLP-1 weight loss calculator to compare projected outcomes at different doses before choosing treatment.
Do I need a GP referral to access Mounjaro privately?
No. For private prescription access, you do not need a GP referral. An online consultation with a UK-licensed prescriber is sufficient. However, informing your GP is advisable so they can monitor your progress and any medication interactions.
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.