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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How Much Does 5 mg Mounjaro Cost in the UK?
The 5 mg dose is the first standard maintenance dose of Mounjaro (tirzepatide) after the 2.5 mg starter dose. Costs vary significantly depending on whether you access it through the NHS or a private prescription route. In the UK, private costs typically range from £129 to £320 per month depending on the provider and dose, while NHS access is free but involves waiting for specialist services. This guide explains pricing, eligibility, and how to access this GLP-1 and GIP receptor agonist injection in the UK.
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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 Prescription Costs and Access Routes
In the UK, private prescription costs for Mounjaro vary by provider and dose level. A typical 5 mg Mounjaro KwikPen (containing 4 weeks of injections) costs between £129 and £250 per month on the private route, though some providers may charge differently. This price includes the prescription fee, clinical assessment, and medication. To access Mounjaro privately, you'll need an online consultation with a UK-licensed prescriber through a GPhC-registered pharmacy. The prescriber will assess your eligibility based on your BMI and weight-related health conditions using your medical history. If approved, your prescription is dispensed directly to your home. Private access bypasses NHS waiting lists, which in many regions can extend several months to over a year for tier 3 specialist weight management services.
- Typical private cost: £129–£250 per month for 5 mg dose
- Includes prescription, assessment, and medication delivery
- No NHS referral required for private route
- Available within days of approval
- Prescriber assesses eligibility based on BMI and health conditions
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 Access vs Private: Timeline and Eligibility
NHS access to Mounjaro is free, but availability depends on your region and local Integrated Care Board (ICB) commissioning decisions. To access Mounjaro on the NHS, you must first be referred to a tier 3 specialist weight management service by your GP, which typically requires meeting strict eligibility criteria: a BMI of 30 kg/m² or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or cardiovascular disease. Once referred, waiting times vary considerably—some regions have waiting lists of 6–18 months. Eligibility thresholds are lower (BMI 27.5+) for people of South Asian, Chinese, Black African, or Black Caribbean heritage. Use our free BMI calculator to check your personal BMI instantly and understand which access route may be appropriate for you.
- 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.
What does 5 mg Mounjaro cost on a private prescription in the UK?
Private Mounjaro typically costs £129–£250 per month for a 5 mg dose, depending on the provider. This includes the prescription assessment, the KwikPen (4 weeks of injections), and delivery. Costs may vary slightly between different GPhC-registered pharmacies offering online prescribing services.
Is Mounjaro free on the NHS?
Yes, Mounjaro is free on the NHS if you're eligible and referred to a specialist tier 3 weight management service by your GP. However, availability and waiting times vary significantly by region. Some areas have lengthy waiting lists. Private prescription routes are faster but involve costs.
What is the difference between the 5 mg and other Mounjaro doses?
The 5 mg is the first maintenance dose after starting on 2.5 mg for 4 weeks. Higher doses (7.5, 10, 12.5, 15 mg) are available for escalation every 4 weeks. Each dose step in the titration schedule is a separate KwikPen, and costs may vary by dose level depending on the provider.
How do I access a private Mounjaro prescription in the UK?
Complete an online health questionnaire with a GPhC-registered pharmacy offering tirzepatide. A UK-licensed prescriber will review your information and eligibility. If approved, your prescription is issued and dispensed to your home. The process typically takes 2–5 working days from approval.
Am I eligible for Mounjaro?
You may be eligible if you have a BMI of 30 kg/m² or above, or 27–29.9 with weight-related conditions (diabetes, high blood pressure, cardiovascular disease). Use our free GLP-1 weight loss calculator to explore your options, or speak with your GP or an online prescriber for a personalised assessment.
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.