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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Where to Buy Mounjaro in the UK: Cost and Access
Mounjaro (tirzepatide) is available in the UK through both NHS specialist weight management services and private prescription routes. Access depends on your eligibility, location, and whether you qualify through the NHS or prefer to pursue private treatment. This guide explains how to obtain Mounjaro, what it costs, and the different pathways available to UK adults seeking this 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 Prescription Access and Cost in the UK
Private access to Mounjaro in the UK is available through GPhC-registered online pharmacies following an online clinical consultation with a UK-licensed prescriber. Costs typically range from £129 to £320 per month, depending on your dose and which provider you use. The Mounjaro KwikPen contains four weekly injections (one month's supply), and pricing varies by starting dose (2.5 mg) through to maximum maintenance dose (15 mg). Private providers usually offer discreet delivery to your home address within 2–3 working days. You do not need an NHS referral to access Mounjaro privately — you can request a consultation directly if you meet the eligibility criteria (BMI 30 or above, or BMI 27–29.9 with weight-related health conditions). The clinical assessment is completed online and typically takes 10–15 minutes. If approved, your prescription is sent electronically to the pharmacy and dispensed within hours.
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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 Route: What's the Difference?
NHS access: NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use through NHS specialist weight management services (tier 3 and tier 4 services). However, availability is limited and varies significantly by region and Integrated Care Board (ICB). Waiting lists can be months or years in some areas. You must be referred by your GP to a specialist service, and access typically requires meeting stricter criteria, including evidence of prior weight loss attempts. Private access is faster, with no waiting list, but costs significantly more and is not funded by the NHS. Both routes require a clinical assessment to confirm you are medically suitable. Use our free BMI calculator and GLP-1 weight loss calculator to understand your eligibility and potential outcomes before consulting a 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 cost on private prescription in the UK?
Private Mounjaro costs typically range from £129 to £320 per month depending on your dose. The Mounjaro KwikPen (four weekly injections) is dispensed monthly. Prices vary between providers, so it's worth comparing. Some providers offer discounts for annual upfront payment or multiple months purchased together.
Can I get Mounjaro on the NHS in the UK?
Yes, NICE has approved tirzepatide for NHS use through specialist weight management services. However, NHS availability is limited and varies by region. You need a GP referral to a tier 3 specialist service. Waiting lists are often very long. Private prescription is typically faster but costs more.
What's the online consultation process for private Mounjaro?
You complete a brief online medical questionnaire (10–15 minutes) with a UK-licensed prescriber. They review your health history, weight, BMI, and any medications. If approved, your prescription is issued electronically to a pharmacy and dispensed within hours. Delivery typically arrives in 2–3 working days.
Is Mounjaro the same as weight loss injections advertised as "slimming jabs"?
Yes, Mounjaro is a type of weight loss injection (specifically a GIP and GLP-1 receptor agonist). It's also available as the brand-name injection Wegovy (semaglutide), which is a GLP-1 agonist only. Both are prescription-only medicines that require clinical assessment and a valid UK prescription.
Do I need a prescription to buy Mounjaro, and where can I get one?
Yes, Mounjaro is prescription-only in the UK and cannot be bought without a valid prescription from a UK-licensed prescriber. Private prescriptions come from online consultations with GPhC-registered services. NHS prescriptions come from specialist weight management services following GP referral. Never purchase Mounjaro without a prescription — it's illegal and unsafe.
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.