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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Best Place to Get Mounjaro in the UK
If you're looking for Mounjaro in the UK, you have two main routes: NHS specialist weight management services or private prescription through an online consultation. Mounjaro (tirzepatide) is a prescription-only medicine, so you'll need a clinical assessment from a licensed prescriber before it can be dispensed. This guide explains both access routes, what to expect, typical costs, and eligibility criteria to help you make an informed decision. Use our free GLP-1 weight loss calculator to explore potential outcomes while you consider your options.
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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.
NHS vs Private Access for Mounjaro in the UK
NHS Access: Mounjaro is available through NHS tier 3 specialist weight management services following NICE approval. You'll need a GP referral and will typically be assessed by a dedicated weight management team. NHS access is free, but availability varies significantly by region and waiting lists can be several months to over a year in many areas. Eligibility requires a BMI of 30 or above (or 27–29.9 with weight-related health conditions like type 2 diabetes or cardiovascular disease). Use our free BMI calculator to check your starting point.
Private Access: Private prescription is available through GPhC-registered online pharmacies and prescribing services. You'll complete an online consultation with a UK-licensed prescriber who will assess your medical history and eligibility. If approved, a prescription is issued and Mounjaro is dispensed by the pharmacy. Private access typically takes 3–7 days from consultation to delivery. Costs range from £129–£320 per month depending on your starting dose (2.5 mg) through to maintenance dose (up to 15 mg).
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.
Cost Breakdown and the Online Consultation Process
Private Costs: Starting doses (2.5 mg) cost approximately £129–£160 per month, while higher doses (10–15 mg) cost £220–£320 per month. Prices vary between providers. Each KwikPen contains four weeks' supply (four once-weekly injections). Most providers offer flexible subscription or one-off purchase options. Some offer bundle discounts for longer-term access.
Online Consultation: You'll answer detailed health questions about your weight, medical history, current medications, and weight loss goals. The prescriber reviews your information within 24–48 hours and contacts you with their assessment. If Mounjaro is clinically appropriate and you meet eligibility criteria, a prescription is issued. Payment is typically taken before dispensing. Delivery via courier takes 1–3 working days.
- 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.
Is Mounjaro cheaper on the NHS or through private prescription?
Mounjaro is free on the NHS but with long waiting lists. Private costs £129–£320/month depending on dose. NHS is cheaper overall if you can access it, but availability varies by region. Ask your GP about specialist services in your area.
What happens during a private online consultation for Mounjaro?
You complete a detailed health questionnaire online covering weight, medical history, medications, and lifestyle. A UK-licensed prescriber reviews this within 24–48 hours, assesses your eligibility, and either approves or declines your prescription. If approved, you pay and receive your first KwikPen within 1–3 days.
How quickly can I get Mounjaro through private prescription vs NHS?
Private: 3–7 days from initial consultation to delivery. NHS: typically 2–12 months or longer waiting for tier 3 specialist assessment, depending on your region and local ICB commissioning.
What does the £129–£320 monthly cost for Mounjaro include?
The monthly cost covers the four pre-filled KwikPen devices (one week's supply per pen, four weeks total). You'll start at the lowest dose and increase weekly over 16–20 weeks until reaching your effective maintenance dose. Costs reflect the specific dose you're on.
Can I switch between NHS and private Mounjaro, or vice versa?
You can theoretically switch, but it's not recommended without prescriber guidance. NHS and private providers don't always coordinate. If switching, inform your new prescriber of your current dose and titration stage to avoid interruptions or dangerous dose changes.
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.