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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Travelling With Mounjaro — A UK Guide
Travelling with Mounjaro requires careful planning, particularly around storage and keeping your KwikPen pens in the right conditions. Whether you're taking a short trip within the UK or travelling abroad, understanding how to transport and store your tirzepatide injection safely is essential. This guide covers practical advice for keeping your Mounjaro at the correct temperature, managing your doses while away, and what to do if you need to cross borders. Planning ahead helps ensure your weight management treatment stays on track during your travels.
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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 Temperature Requirements for Mounjaro While Travelling
Unopened Mounjaro pens must be stored in a refrigerator between 2°C and 8°C — this is non-negotiable. If you're travelling, you'll need a portable cool bag or travel cooler with ice packs to maintain this temperature range. Freezing your pens will damage them irreversibly, so avoid packing them directly against ice.
- Use a cool bag designed for medication storage or a standard insulated bag with frozen ice packs placed away from direct contact with your pens
- Once you've used a pen (first injection), it can be kept at room temperature below 30°C for up to 30 days — this makes short trips easier
- Keep your pens in their original carton to protect from light exposure
- If travelling to a warmer country, plan to use a medication refrigerator pack or request a mini-fridge in your hotel accommodation
- Check your accommodation's fridge temperature before storing your pens — many hotel fridges are colder than 8°C
For longer trips lasting more than 30 days, contact the pharmacy that dispensed your Mounjaro to discuss options for storing your unused pens or arranging additional supplies.
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.
Travel Documentation and Prescription Requirements
Keep your original pharmacy packaging and labels on your Mounjaro pens — this is essential for travelling through UK airports and international borders. Your KwikPen must be clearly labelled with your name and the medication name (tirzepatide/Mounjaro).
- Carry a copy of your prescription or a letter from your prescriber confirming you use Mounjaro as prescribed medication — this helps at airport security
- If travelling to the EU, USA, or other international destinations, check those countries' import regulations for prescription medications in advance
- Mounjaro should be packed in your hand luggage, not checked baggage, to avoid temperature exposure and maintain refrigeration access
- If you're travelling for more than 4 weeks, you may need to arrange additional supplies — discuss this with your healthcare provider well ahead of your trip
- Keep receipts or proof of purchase if you've accessed Mounjaro privately — this supports international travel documentation
- 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 when travelling?
Yes. Keep your KwikPen in its original packaging with clear labelling. Carry your prescription or a letter from your prescriber confirming it's prescribed medication. Inform airport staff during screening. Mounjaro should travel in your hand luggage to maintain the correct temperature.
What if I miss a dose while travelling?
If you miss your dose by fewer than 4 days, take it as soon as you remember and continue your normal weekly schedule. If more than 4 days have passed, skip the missed dose and resume your regular schedule the following week. Never take a double dose.
How do I manage time zone changes when travelling internationally with Mounjaro?
Since Mounjaro is once-weekly (not daily), time zones have minimal impact. Choose a convenient day each week to take your injection that fits your travelling schedule. If you normally inject on Monday, you can shift to Tuesday or Wednesday during travel — just maintain the 7-day spacing between doses.
Can I store Mounjaro in a standard cool bag without a fridge while travelling in the UK?
Yes, for trips under 24–48 hours. Use a well-insulated cool bag with ice packs, keeping them away from direct contact with your pens. For longer trips, request a fridge in your accommodation or use a medication cooler designed specifically for insulin and injection storage.
What documentation do I need to travel abroad with Mounjaro?
Carry your original pharmacy labels, a copy of your UK prescription, and ideally a letter from your GP or prescriber stating Mounjaro is prescribed for your weight management. Check the destination country's medication import rules in advance, as some countries restrict certain prescription medications. Always pack in hand luggage, never checked baggage.
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.