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: Cost and Routes
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS specialist services and private online prescribing. Access routes and costs differ significantly depending on which pathway you choose. This guide explains how to get Mounjaro, what it costs privately, NHS eligibility, and what the application process involves. Whether you're exploring NHS options or private access, understanding the true costs and requirements is essential before starting any treatment.
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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 Mounjaro Costs in the UK
Private prescription costs vary depending on the dose, but typically range from approximately £129 to £320 per month. Each KwikPen contains four weekly injections (a one-month supply). Costs increase at higher doses — the starting dose of 2.5 mg is usually the most affordable, while the maximum dose of 15 mg is the most expensive. When comparing private costs, remember you're paying for both the medication and the clinical assessment required before prescription. Some providers offer subscription discounts if you commit to longer-term treatment. It's worth checking whether your chosen provider offers dose-step pricing, as you'll typically start on a lower dose and increase gradually over several months before reaching maintenance. The weekly weight loss injection format means consistent, predictable costs — unlike some diet programmes with hidden fees.
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 Prescription Route
NHS access to Mounjaro is through specialist tier 3/4 weight management services, not standard GP prescription. You'll need a referral from your GP to a regional specialist service, which can involve waiting lists of several months to years depending on your area. Private access is faster — an online consultation with a UK-licensed prescriber typically takes days, not months. If eligible, you'll receive a prescription to send to a GPhC-registered pharmacy. The private route requires you to cover the full cost yourself, while NHS treatment is free at point of care (though availability varies by region and depends on local commissioning). Use our GLP-1 weight loss calculator to explore potential outcomes, and our BMI calculator to understand your starting point before pursuing either route.
- 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 long does it take to get Mounjaro on the NHS?
NHS access involves referral to a specialist weight management service (tier 3 or 4), which can take several months to a year or more depending on your region. Waiting lists vary significantly across UK ICBs. Your GP can discuss your local pathway and expected timescale. Private access is typically faster — often available within days of your online assessment.
What's included in the private Mounjaro prescription cost?
Private costs cover both the medication (tirzepatide injection) and the clinical assessment by a UK-licensed prescriber. The prescriber reviews your medical history, weight, BMI, and any weight-related health conditions before deciding if Mounjaro is suitable. Some providers include follow-up consultations in their fee; others charge separately.
Can I get Mounjaro prescribed through my GP?
In most areas, no — Mounjaro is primarily prescribed through NHS specialist weight management services (tier 3), not standard GP prescriptions. Your GP can refer you to your local specialist service. Private prescription is available through online consultations without NHS referral, but you'll pay privately.
What happens after I'm prescribed Mounjaro?
You receive a prescription to send to a pharmacy, which dispenses your KwikPen pens. You'll need to inject once weekly. Prescribers typically require regular check-ins (online or phone) every 4–8 weeks to monitor your progress and adjust your dose if needed. Track your weight loss journey using our free progress tracker alongside your treatment.
Is private Mounjaro cost the same at every provider?
No — costs vary between providers based on dose, consultation fees, and whether follow-up appointments are included. Compare providers carefully; cheaper options may exclude follow-up support. Ensure any provider is GPhC-registered and uses UK-licensed prescribers before proceeding with treatment.
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.