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 Order Mounjaro in the UK
If you're looking for the best place to order Mounjaro in the UK, you have two main routes: NHS specialist weight management services or private online prescribing through a UK-licensed prescriber. Both require a clinical assessment to confirm eligibility, but they differ significantly in access, waiting times, and cost. Understanding your options helps you make an informed decision about which route suits your circumstances.
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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 — How They Differ
NHS Route: Mounjaro is available through NHS specialist tier 3/4 weight management services. You'll need a referral from your GP, followed by assessment and prescription through a specialist service. This is free at the point of care but availability varies significantly by region and waiting lists can be several months to over a year in some areas. The NHS KwikPen prescription includes support from a multidisciplinary team (dietitian, psychologist, nurse specialist).
Private Route: You can order Mounjaro through a private online consultation with a UK-licensed prescriber registered with the General Pharmaceutical Council (GPhC). The prescriber assesses your eligibility via online consultation, issues a prescription, and it's dispensed by a registered pharmacy. This is faster — typically 3–7 days from consultation to delivery — but costs between £129 and £320 per month depending on dose and provider. You don't need a GP referral.
Key Difference: Both routes require a genuine clinical assessment. Neither offers Mounjaro without confirmation that you meet eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions).
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.
Mounjaro vs Wegovy — Which Should You Order?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are UK-licensed weight loss injections available through similar NHS and private routes. Mounjaro is a dual GIP and GLP-1 receptor agonist — activating two hormone pathways — while Wegovy is a GLP-1 agonist only. Clinical trials showed Mounjaro achieved average weight loss of 15–21% of body weight, while Wegovy achieved approximately 15%. However, individual results vary significantly. The choice depends on your personal health profile, previous medication responses, and prescriber assessment. Neither is universally "better" — suitability is individual. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses, and discuss both options with your prescriber during your clinical assessment.
- 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 order Mounjaro online in the UK without seeing my GP?
Yes, through private online prescribing. You don't need a GP referral. A UK-licensed prescriber will assess you via online consultation. If approved, they'll issue a prescription dispensed by a registered pharmacy. This is faster than the NHS route but involves a private cost.
How long does it take to receive Mounjaro on the NHS?
NHS waiting times vary by region. Initial GP referral to specialist assessment can take weeks; once approved, you may wait weeks more for your first appointment. Total waiting time is often 3–12 months or longer depending on your local integrated care board (ICB) capacity.
Is Mounjaro cheaper on the NHS or private?
Mounjaro is free on the NHS (no prescription charges). Private prescriptions typically cost £129–£320 per month depending on dose. However, private access is often faster. The NHS route offers multidisciplinary support included; private routes vary by provider.
How do I know if I'm eligible for Mounjaro in the UK?
You need a BMI of 30 kg/m² or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, sleep apnoea, or heart disease). Lower BMI thresholds apply if you're of South Asian, Chinese, Black African, or Black Caribbean heritage. A prescriber will confirm eligibility during your assessment.
What's the difference between ordering Mounjaro and Wegovy?
Both are UK-licensed injectable weight loss medications available through NHS and private routes. Mounjaro (tirzepatide) is a dual GIP+GLP-1 agonist; Wegovy (semaglutide) is GLP-1 only. Mounjaro starts at 2.5 mg weekly; Wegovy starts at 0.25 mg weekly. Clinical trial outcomes differ slightly but individual results vary. Your prescriber will help choose the best option for you.
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.