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 Through UK Pharmacies
Mounjaro (tirzepatide) is a prescription-only weight management injection available through UK pharmacies, but accessing it requires a valid prescription from a licensed GP or specialist prescriber. You cannot buy Mounjaro over the counter or without a clinical assessment. This guide explains your options for accessing Mounjaro in the UK, whether through NHS specialist weight management services or private online prescribing routes, and what eligibility criteria you'll need to meet.
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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.
Accessing Mounjaro: NHS vs Private Routes
In the UK, you can access Mounjaro through two main routes: NHS specialist services or private prescribing.
NHS Route: Your GP can refer you to a tier 3 specialist weight management service if you meet eligibility criteria (BMI ≥30, or BMI 27–29.9 with weight-related health conditions). NICE has approved tirzepatide for NHS use, but availability varies significantly by region and ICB (integrated care board). Waiting lists can be lengthy — some areas have waits of 12+ months. Once assessed by the specialist team, they may prescribe Mounjaro alongside lifestyle support.
Private Route: You can obtain a Mounjaro prescription through a GPhC-registered online pharmacy following a virtual clinical assessment with a UK-licensed prescriber. This route doesn't require NHS referral and is typically faster. Prescribers assess your medical history, current medications, and eligibility before issuing a prescription. Once issued, the prescription is dispensed by the pharmacy.
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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.
Eligibility, Prescription Requirements, and Costs
To be eligible for Mounjaro in the UK, you must have a BMI of 30 kg/m² or above, or BMI 27–29.9 with at least one weight-related health condition (type 2 diabetes, hypertension, sleep apnoea, cardiovascular disease, or abnormal blood fats). South Asian, Chinese, Black African, and Black Caribbean adults may qualify at slightly lower BMI thresholds. Private costs typically range from £129–£320 per month depending on your dose, with the KwikPen containing a 4-week supply. Calculate your current BMI using our free BMI calculator to check where you stand. You'll receive your Mounjaro KwikPen in a refrigerated package — store unopened pens at 2–8°C, or at room temperature below 30°C for up to 30 days after first use.
- 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 buy Mounjaro without a prescription in the UK?
No. Mounjaro is prescription-only in the UK. You cannot purchase it over the counter or from an unlicensed seller. You must obtain a valid prescription from a UK-licensed GP or prescriber, whether through NHS services or private online consultations.
How do I know if I'm eligible for Mounjaro on the NHS?
NHS eligibility requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions. Your GP can assess you initially, but you'll be referred to a specialist tier 3 weight management service for final assessment and prescription. Availability varies by region.
What's the difference between accessing Mounjaro privately vs on the NHS?
NHS access is free but involves specialist referral and potentially long waiting lists. Private access is faster but costs £129–£320/month depending on dose. Both require a clinical assessment. Private routes avoid NHS waiting times but are not subsidised.
What happens after I get my Mounjaro prescription?
Your prescription is sent to a GPhC-registered pharmacy, which dispenses your Mounjaro KwikPen. You'll receive it in a refrigerated package. You inject once weekly — your prescriber will guide dosing. Track your progress using our free progress tracker and attend any follow-up appointments with your prescriber.
Is Mounjaro the same as Ozempic?
No. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist. Ozempic contains semaglutide and is licensed for type 2 diabetes, not weight management. Wegovy (also semaglutide) is the licensed weight management version. Mounjaro and Wegovy are different medications with different mechanisms and trial data.
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.