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
Free tracker included with every download this week
How to Order Mounjaro Online in the UK
Mounjaro (tirzepatide) is a prescription-only weight management injection available online in the UK through licensed prescribers and registered pharmacies. If you're considering ordering Mounjaro online, you'll need to complete a clinical assessment with a UK-licensed healthcare professional who will evaluate your eligibility based on your BMI, health history, and weight-related conditions. This guide explains the process, requirements, and what happens after you order.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
What You Need to Know Before Ordering Mounjaro
Mounjaro is a prescription-only medicine — it cannot be purchased without a valid prescription from a UK-licensed doctor or nurse prescriber. To order online, you'll first need to complete an online clinical assessment with a registered healthcare provider. During this assessment, the prescriber will review your eligibility based on NHS criteria: a BMI of 30 or above (or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease).
- Age: You must be 18 or over
- Medical history: The prescriber will ask about current medications, allergies, and health conditions
- Pregnancy: Not suitable if pregnant, planning pregnancy, or breastfeeding
- Previous GLP-1 use: Disclose if you've used Wegovy, Saxenda, or Ozempic
If approved, a prescription is issued electronically to a GPhC-registered pharmacy, which then dispenses your Mounjaro KwikPen. Use our GLP-1 weight loss calculator to understand potential outcomes alongside lifestyle changes.
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.
The Online Ordering Process Explained
The typical process involves: (1) selecting a registered online prescriber or pharmacy, (2) completing a health questionnaire and consultation (often a video call), (3) prescription approval if you meet criteria, and (4) delivery to your address. Turnaround time varies but typically takes 3–7 working days from approval to delivery. Mounjaro costs range from approximately £130–£300 per month depending on your dose, as the NHS KwikPen is not routinely available on prescription outside specialist tier 3 services.
Always ensure the provider is registered with the GPhC (General Pharmaceutical Council) and that a real UK-licensed prescriber reviews your case — never order from unregistered or non-UK-based sources. Check the provider's credentials before providing personal or payment information.
- 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 it legal to order Mounjaro online in the UK?
Yes, provided you order through a GPhC-registered pharmacy with a prescription from a UK-licensed prescriber. Online prescribing is legal and regulated in the UK. Always verify the pharmacy's GPhC registration and that a qualified healthcare professional conducts your assessment — never use unregistered or offshore services.
What's the difference between ordering Mounjaro and Wegovy online?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only weight management injections available via UK online prescribers. Mounjaro is a dual GIP/GLP-1 agonist with a maximum dose of 15 mg weekly, while Wegovy is a GLP-1 agonist with a maximum dose of 2.4 mg weekly. The prescriber will assess which is more suitable for you.
How long does it take to receive Mounjaro after ordering online?
Typically 3–7 working days from prescription approval to delivery. This includes the clinical assessment, prescriber review, pharmacy dispensing, and Royal Mail delivery. Some providers offer next-working-day delivery at additional cost. Check your specific provider's timescales during the ordering process.
Will I need follow-up consultations after ordering Mounjaro online?
Yes. Most online providers require follow-up check-ins every 4–12 weeks to monitor your progress, assess how you're responding to the medication, and manage any side effects. These are typically brief consultations conducted online. This ongoing support is important for safe and effective treatment.
Can I order Mounjaro online if I'm already on the NHS waiting list?
Yes. Many people order privately while waiting for NHS specialist services. However, inform your GP that you're using private Mounjaro so they can monitor your progress and any interactions with other medications. If you're offered Mounjaro through the NHS later, discuss with both providers how to manage the transition.
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.