Holidays are the perfect time to relax, switch off, and enjoy yourself, but they can also bring some challenges if you're trying to manage your weight. The good news? With a little planning and a flexible mindset, it’s possible to enjoy your break and stay on track with your goals.
Here's what to know before you go, and some simple, realistic tips to help you feel in control without missing out on the fun.
Can you take Mounjaro on holiday?
Yes. There's no reason you can't travel with Mounjaro, whether you're going away for a weekend or several weeks. The main things to plan for are storing your pen correctly, carrying it through security and customs, and working out your dose timing if you're crossing time zones.
Can you take Mounjaro on a plane?
Yes. Weight loss pens, including Mounjaro, can be carried in hand luggage as medically necessary items, and airlines generally allow this even though the medication is a liquid over the usual 100ml limit. A few things to have ready:
- Pack it in your hand luggage, not hold luggage. Hold luggage can go missing and is subject to freezing in the plane hold, which can damage the medication.
- Keep it in its original packaging so it can be easily identified by airport staff and border control.
- Carry your prescription letter or signed prescription copy alongside your medication, airport and airline staff may ask for it, particularly for international flights.
- Check with your airline in advance if you're unsure about their specific policy on carrying medical liquids, pens, or needles, as policies can vary between airlines and airports.
How to store your Mounjaro pen while travelling
Mounjaro (tirzepatide) KwikPens should normally be kept in the fridge at 2–8°C. Once a pen is in use, Lilly's guidance allows it to be stored unrefrigerated for up to 30 days, as long as the temperature doesn't go above 30°C, which covers most holiday scenarios without needing to pack a cool bag for a short trip. A few practical rules:
- Never freeze it. If a pen has frozen, it must be discarded, don't try to thaw and use it.
- Keep it out of direct light and heat - store it in its original carton where possible, and don't leave it in direct sun, a hot car, or on a sunny windowsill.
- Don't store it with the needle attached between doses, to prevent leaking or air entering the pen.
- For hot destinations or longer trips, an insulated travel pouch with a gel pack is a sensible extra precaution. Place a layer of fabric between the pen and the gel pack so it doesn't freeze.
- On arrival, transfer your pen to a fridge if you're staying somewhere longer than a few days and have access to one.
- If in doubt about how your pen has been stored, for example if you're unsure it stayed below 30°C, check with your pharmacist before using it rather than guessing.
Managing your dose timing across time zones
Mounjaro is a once-weekly injection, and the exact hour doesn't need to be precise, most people have some flexibility around their usual dose day. If you're travelling across time zones:
- Aim to stay close to your usual day rather than the exact local time. A few hours either way isn't generally a problem.
- If your dose is due while you're away and you're unsure how to manage the shift, get in touch with Phlo Clinic beforehand for advice specific to your situation.
- Don't double up if you're unsure whether you've already taken a dose, check with your pharmacist rather than guessing.
If you've already taken your injection shortly before travelling, that's one less thing to think about, and you can relax and enjoy the trip.
Enjoy the food – mindfully
If you'd ordinarily spend a lot of your holiday exploring the local food scene, you don't have to give that up. The key is shifting your mindset from quantity to quality. Trying lots of things in small portions gives you all the variety and newness you're craving without the huge intake and you won't feel any better eating a large volume of the same food.
In practice, this could mean:
- Sharing dishes with the people you're eating with, so you can try more without overordering.
- Choosing small-plate styles like tapas, mezze, and street food markets, which suit a smaller appetite perfectly and let you sample a destination's food culture properly.
- Following the 80/20 rule: aim to make mindful choices most of the time and enjoy the occasional treat without guilt.
- Avoiding skipping meals: it can lead to overeating later in the day.
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Make the most of the food at an all-inclusive
All-inclusive's get a bit of a bad reputation, but they can actually be a great opportunity to try new foods without committing to large portions. Most people struggle because they go from a structured routine at home to none at all, and end up grazing all day, so try to keep to rough regular meal times to give your day some shape.
A few practical habits that make buffets much easier to manage:
- Walk the full length of the buffet first and size up your favourites before you pick up a plate.
- Use the T-plate method to portion up: half vegetables or salad, a quarter protein, a quarter carbohydrate.
- Remember hotels repeat their meals across the week. There's no need to load your plate, because the meal will come back.
Be aware how much alcohol you drink
With drinks included or flowing more freely on holiday, it's easy to lose track. If you do want a drink or two while you're away, set yourself a start time, a cut-off time, and a drinks limit before you begin. Have your first drink with a meal rather than on an empty stomach. With a suppressed appetite, you may be emptier than you realise, and tolerance is usually lower on GLP-1 medications too, so overdoing it is more likely to leave you feeling nauseous.
A few other things to keep in mind:
- Choose lighter options such as spirits with soda water or a dry wine over sugary cocktails.
- Alternate every alcoholic drink with water, since alcohol increases your risk of dehydration.
Read more about Mounjaro and alcohol.
Keep moving (and make it more holiday fun)
You don’t need to stick to a strict routine, just keep active in a way that fits your holiday:
- Walk, swim, explore, dance – anything that keeps you moving.
- Even 15–20 minutes of gentle activity each day can boost digestion, energy and mood.
Side effects to watch for in a different climate
Travelling somewhere hotter or more humid than the UK can change how side effects show up. Hydration is the priority: heat, alcohol, and side effects like nausea, vomiting, and diarrhoea all raise the risk of dehydration, and a suppressed appetite means you may forget to drink as well as eat. Aim for 2 to 3 litres of fluid a day, carry a water bottle with you, and limit alcohol and caffeine.
It's also worth remembering that those same symptoms, nausea, vomiting, diarrhoea, are typical of foodborne illness too, so eat from hygienic places and consider whether or not it's the medication that is making you feel unwell. Eating little and often helps with nausea, and gentle daily walks help keep constipation at bay.
Stay hydrated
Especially in the heat, water is key:
- Carry a reusable water bottle and sip throughout the day.
- Aim for 2–3 litres of fluid daily and remember that a suppressed appetite can mean you forget to drink as well as eat.
- Often, we confuse thirst with hunger so staying hydrated may also help manage your appetite.
7. Check in with yourself – not just the scales
- Focus on how you feel, not just what you eat.
- One indulgent meal or dessert isn’t a failure, it’s part of the experience.
- Be kind to yourself – holidays support your mental wellbeing too.
Key takeaway
Taking Mounjaro on holiday just takes a little planning: know how long your pen can stay out of the fridge (up to 30 days below 30°C), carry it in your hand luggage in its original packaging, and don't stress too much about exact dose timing across time zones. Beyond that, a flexible, mindful approach to food, drink, and activity means you can enjoy your break without putting your progress on hold. If you're unsure about your injection timing, storage, or managing side effects while away, Phlo Clinic is always here to help.
If you’re unsure about your injection timing around travel or want advice on managing appetite or side effects while away, Phlo Clinic is always here to help.
References
Lilly UK Medical Information (2026). How should the Mounjaro® (tirzepatide) KwikPen® be stored? Available at: https://medical.lilly.com/uk/products/answers/how-should-the-mounjaro-tirzepatide-kwikpen-be-stored-217607
Drugs.com (2026). Does Mounjaro need to be refrigerated? Available at: https://www.drugs.com/medical-answers/mounjaro-need-refrigerated-3575493/
