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 to Access Mounjaro in the UK and What It Costs
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes, though access and cost vary significantly depending on which route you choose. This guide explains how to get Mounjaro, what you can expect to pay, and the differences between NHS and private access. Understanding your options helps you make an informed decision about whether this prescription-only weight management injection 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.
Private Access and Cost in the UK
Private Mounjaro access in the UK is available through registered online prescription services following a clinical assessment by a UK-licensed prescriber. Costs typically range from £150 to £320 per month depending on your dose and the provider. A Mounjaro KwikPen contains 4 weekly injections (one month's supply), and each refill requires repeat clinical review.
- Starting dose (2.5 mg): approximately £150–£180/month
- Maintenance doses (5–10 mg): approximately £180–£250/month
- Higher doses (12.5–15 mg): approximately £250–£320/month
Private prescribing eliminates NHS waiting lists — you can typically receive your first dose within days of a successful assessment. Prices vary between providers, so comparing costs before starting is advisable. Try our GLP-1 weight loss calculator to understand potential outcomes at different doses, which may help inform your decision.
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 — Which Route Is Right for You?
NHS access to Mounjaro is through tier 3 specialist weight management services, typically requiring a GP referral. NICE has approved tirzepatide for use within NHS specialist services, but availability varies significantly by region and waiting lists can extend to months or years in many areas. NHS treatment is free at the point of use, but access requires meeting specific BMI thresholds and health criteria assessed by specialists.
Private access offers faster treatment initiation without NHS referral, though you pay the full cost of each injection. Online consultations assess your medical history, current medications, and suitability for treatment. Both routes require an initial clinical assessment — no prescriptions are issued without this. Check your personal BMI using our free BMI calculator to understand your eligibility before booking a consultation.
- 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 cost privately in the UK?
Private Mounjaro costs between £150 and £320 per month depending on dose. Starting doses (2.5 mg) cost around £150–£180/month, while maximum doses (15 mg) cost £250–£320/month. Each KwikPen contains 4 weekly injections. Prices vary between providers, so it's worth comparing before committing.
Can I get Mounjaro on the NHS in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use through specialist tier 3 weight management services. You'll need a GP referral and must meet eligibility criteria (BMI 30+ or 27+ with weight-related health conditions). Availability and waiting times vary significantly by region — some areas have long waiting lists.
How do I access Mounjaro privately in the UK?
Private access requires booking an online consultation with a UK-licensed prescriber. You complete a medical questionnaire, then have a video or phone assessment. If approved, a prescription is sent to a GPhC-registered pharmacy for dispensing. The entire process typically takes 2–5 days from initial consultation.
What's the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, while Wegovy (semaglutide) activates GLP-1 only. Clinical trials showed Mounjaro helped participants lose approximately 15–21% body weight on average, compared to around 15% with Wegovy. Both are prescription-only, once-weekly injections available through similar NHS and private routes.
Do I need a prescription to get Mounjaro?
Yes, Mounjaro is prescription-only in the UK. Private access requires an online clinical assessment and prescription from a UK-licensed prescriber. NHS access requires referral to a specialist weight management service. No Mounjaro can be dispensed without a valid prescription issued by a licensed healthcare professional.
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.