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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What Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes, with costs varying significantly depending on which pathway you choose. If you're considering this GIP and GLP-1 receptor agonist injection for weight management, understanding the pricing and access options will help you make an informed decision about whether it's right for you. This guide covers everything you need to know about Mounjaro availability and cost across the UK.
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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 for Mounjaro in the UK
Private Mounjaro prescriptions in the UK typically cost between £130 and £320 per month, depending on your dose and the provider you choose. The price varies because different registered online prescribers and GPhC-regulated pharmacies set their own charges for consultations, prescriptions, and medication supply.
Starting doses (2.5 mg and 5 mg) are generally at the lower end of this range, while higher doses (10 mg, 15 mg) may cost more. Each Mounjaro KwikPen device contains 4 weekly doses, so a month's supply equals one device. Before receiving a private prescription, you'll need to complete an online clinical assessment with a UK-licensed prescriber, who will evaluate your eligibility based on your BMI, health history, and any weight-related conditions. This assessment is essential because Mounjaro is prescription-only and requires professional medical judgment. Many private providers include this consultation fee within the overall cost, though some charge separately. You can use our free BMI calculator to check your starting point before beginning an online consultation.
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 vs Private Access Routes
NHS access to Mounjaro is through specialist tier 3 weight management services, requiring a referral from your GP. NICE has approved tirzepatide for use within NHS specialist services, but availability varies considerably by region and ICB (Integrated Care Board). Waiting lists can extend from months to years in some areas. Private access bypasses NHS waiting lists entirely—you can begin treatment within days of a successful online assessment, though you'll pay the full private cost. Many people choose private routes due to NHS waiting times, though NHS treatment is free at the point of use. Your GP can advise whether NHS specialist services are available in your area and what the current waiting time is. Once on either route, dose titration typically progresses from 2.5 mg upwards every four weeks until you reach your effective maintenance dose.
- 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.
Can I get Mounjaro on the NHS for lower cost?
Yes, Mounjaro is available through NHS specialist weight management services at no direct cost to you. However, NHS access requires a GP referral to tier 3 services and can involve lengthy waiting lists. Private prescriptions are typically available much faster but do have a monthly cost.
What's included in the £130–£320 private prescription cost?
This usually covers the prescription fee, clinical assessment, and the medication itself (one KwikPen device with 4 weekly doses). Some providers include consultation costs; others charge separately. Always check what's included before committing.
Why does Mounjaro cost more at higher doses?
Higher doses (10 mg, 15 mg) may cost slightly more because they require more active ingredient per KwikPen. Starting doses (2.5 mg, 5 mg) are generally cheaper. Costs also depend on the individual provider's pricing structure.
How do I know if I'm eligible for Mounjaro on the NHS?
NHS eligibility includes having a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. Your GP can assess your eligibility and refer you to specialist services if appropriate.
What happens after I get a private Mounjaro prescription?
A GPhC-registered pharmacy will dispense your prescription and send your KwikPen devices to you. You'll inject once weekly on the same day each week. After four weeks on each dose, your prescriber may increase your dose, and you'll order your next supply accordingly.
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.