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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Can I Take Mounjaro On Holiday?
Yes, you can take Mounjaro on holiday, but you'll need to plan ahead for storage and prescription access. Mounjaro is a prescription-only injection that requires careful temperature control, and access varies depending on whether you're using an NHS or private prescription. Understanding UK prescription rules, storage requirements, and how to manage your doses while travelling is essential before you go.
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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.
Storage and Transport Requirements for Mounjaro
Unopened Mounjaro KwikPen devices must be stored in a refrigerator at 2–8°C and cannot be frozen. Once frozen, they cannot be used. After first use, your pen can be stored at room temperature (below 30°C) for up to 30 days, making travel within a month more straightforward.
When travelling, keep unopened pens in an insulated cooling bag with ice packs during transit—airlines allow this for medical purposes. A cool travel case specifically designed for insulin and GLP-1 medications is worthwhile for international trips. Never pack Mounjaro in checked baggage where temperatures are unpredictable; always carry it in your hand luggage where you can monitor conditions. Inform airport security that you're carrying prescription medication—having your prescription letter helps.
Plan your injection schedule around your travel dates. If your next dose falls mid-journey, ensure you have access to appropriate refrigeration at your destination before departure.
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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 Prescriptions and Holiday Access
If you're prescribed Mounjaro through the NHS, your prescription is typically issued by a specialist weight management service rather than your GP. Obtaining emergency supplies abroad can be very difficult, and NHS prescriptions cannot be refilled by private pharmacies overseas. For this reason, many people on NHS Mounjaro arrange their doses to fall either before departure or after return, rather than while travelling.
Private prescriptions offer more flexibility—you can arrange online consultations with a UK-licensed prescriber before your trip and have doses dispensed by a GPhC-registered pharmacy. This allows greater freedom to manage your injection schedule around travel plans. However, prescription medication laws vary internationally; some countries restrict bringing in injectable medications even with a valid UK prescription. Always check your destination country's medicines import rules at least 4 weeks before travelling.
Online consultation process: Most private providers offer flexible appointment booking, allowing you to arrange consultations around your holiday plans. You'll need a recent blood pressure reading and may be asked about any health conditions. Prescriptions are typically issued within 24 hours if clinically appropriate, and your medication is dispatched within 1–2 working days. This timeline means you'll need to plan ahead rather than arrange prescriptions last-minute.
Before holiday travel, confirm your prescription expiry date—prescriptions are typically valid for 6 months. If your prescription expires while you're away, obtaining a refill abroad becomes problematic. For NHS patients, discuss holiday planning with your specialist service at your next appointment; they may adjust your dose schedule to accommodate travel dates.
- 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 take Mounjaro through airport security?
Yes. Mounjaro (tirzepatide) is a prescription medication allowed through airport security in your hand luggage. Carry it in your original packaging with your prescription documentation. Inform security staff that you're carrying injectable medication. Cooling bags and ice packs are also permitted. Never pack it in checked baggage where temperatures cannot be controlled.
What's the cost difference between NHS and private Mounjaro on holiday?
NHS Mounjaro is free at point of use if prescribed through specialist services, but accessing supplies abroad is extremely difficult. Private prescriptions cost approximately £129–£320 per month depending on dose, offering more flexibility for travel planning. Private access allows you to arrange doses around your holiday schedule more easily than NHS.
Do I need to tell the airline I'm taking Mounjaro?
You don't need to notify the airline in advance, but inform security staff when passing through. Carry your prescription letter and original packaging. Airlines permit medical cooling bags and ice packs in hand luggage for temperature-sensitive medications. Check individual airline policies if you need refrigerator access during a flight (not available on short flights).
What if my destination country won't let me bring Mounjaro in?
Some countries have strict rules on importing injectable medications. Check your destination's medicines import regulations at least 4 weeks before travel with your GP or prescriber. Some countries allow entry with a valid UK prescription and doctor's letter; others don't. If entry is refused, consider timing your doses before departure or after return rather than during your trip.
Can I refill my Mounjaro prescription abroad?
No—UK prescriptions cannot be refilled by foreign pharmacies, and obtaining Mounjaro without a local prescription abroad is extremely difficult. Plan your doses to avoid running out while travelling. If you're on a private prescription, arrange your doses to be dispensed before departure. NHS patients should discuss holiday dates with their specialist weight management service well in advance.
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.