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 & Access
Mounjaro (tirzepatide) is a prescription-only weight loss injection available in the UK through two main routes: NHS specialist weight management services or private prescription via licensed prescribers. The cost varies significantly depending on which route you choose. This guide explains how to access Mounjaro in the UK, what to expect from the application process, and the typical costs involved. Both routes require a clinical assessment before you can be prescribed this weekly weight loss injection.
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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 Mounjaro Prescription Cost In The UK
Private prescription costs for Mounjaro typically range from £129 to £320 per month, depending on the dose and the private prescribing service you use. Higher doses (15 mg) generally cost more than starter doses (2.5 mg). Each KwikPen contains 4 weeks of injections (one dose per week), and you'll usually need to renew your prescription monthly. Private access is through GPhC-registered online pharmacies following a consultation with a UK-licensed prescriber. The prescriber will review your medical history, BMI, and any weight-related health conditions to assess eligibility. If approved, your prescription is dispensed by the pharmacy directly to you. This route doesn't require NHS referral and can be faster than waiting for specialist NHS services, though costs are your responsibility. Some private services offer package deals or discounts for multiple months upfront.
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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 & Timescales
NHS access to Mounjaro is through tier 3 specialist weight management services, typically requiring a GP referral. However, availability varies significantly by region (ICB), and many areas have lengthy waiting lists—sometimes 12 months or longer. If accepted by NHS specialist services, Mounjaro is provided free, though the assessment and prescription process can be slow. Private access is faster: you complete an online consultation (usually within 24–48 hours), and if approved, your first prescription ships within days. The private route suits those who want quicker access and don't want to wait for NHS pathways. Both routes require you to commit to lifestyle changes—reduced-calorie diet and increased physical activity—alongside medication. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses before deciding which route suits 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.
How long does it take to get Mounjaro on the NHS?
NHS timescales vary by region. Some areas take 3–6 months, others 12+ months. You must be referred by your GP to a tier 3 specialist weight management service first. Availability depends on local funding and service capacity. Private prescription is typically much faster—within days.
Can I buy Mounjaro without a prescription in the UK?
No. Mounjaro is prescription-only and cannot be purchased without a clinical assessment from a UK-licensed prescriber. Any service offering it without a prescription is not legitimate. Always use registered GPhC pharmacies dispensing against valid UK prescriptions.
What's included in the private consultation fee?
Most private prescribing services charge £30–£50 for the initial consultation. This includes medical history review, eligibility assessment, and GP sign-off. Repeat consultations are often cheaper or free. The consultation fee is usually separate from the medication cost.
Will my private Mounjaro prescription be recognised by the NHS later?
Mounjaro prescribed privately is the same medication as NHS Mounjaro. If you later access NHS services, tell your healthcare provider about private treatment. Your NHS GP can take over prescriptions if you meet NHS criteria, though this varies by local policy.
What happens if I can't afford private Mounjaro?
If private costs are unaffordable, discuss this with your GP. Ask about NHS tier 3 weight management services in your area, even if waiting lists are long. Some areas have community weight management programmes at lower cost. Your GP can signpost local options.
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.