Keeping your pens or pills safe, getting them through the airport, and staying on schedule abroad.
Reviewer: Melanie Löfgren (Envigore CEO)
August means holidays, heatwaves and a change of routine, and whether you are on a weekly injection or the daily oral pill, your treatment comes with you. The good news is that travelling with a GLP-1 medicine rarely causes problems. It just takes a little planning. Get the storage and the timing right, and your treatment carries on quietly in the background while you enjoy the break. Here is how to handle the heat, the airport and the time zones.
The golden rule: keep it cool, but never freeze
Your pens live in the fridge, between 2 and 8 degrees, until you start using them. The reassuring part is that they do not need constant refrigeration once you are on the move. Thirty degrees is the number that matters. Below it, your pen is fine at normal room temperature, and you do not need a cooling pack at all. You only need a cool bag when the temperature climbs above 30 degrees, such as a hot country, a hot car, or a long journey in the heat.
Two things will ruin a pen, though. Heat is the first, and the damage is not always visible, so a pen left in a hot car or on a sunny windowsill can be spoiled without looking any different. Freezing is the second, and it is final. A pen that has frozen must be thrown away, even if it has thawed and seems perfectly normal. When in doubt, keep it cool, keep it shaded, and keep it well away from anything icy.
Packing and the airport
Flying takes a few simple steps:
- Pack it in your hand luggage, never in the hold. The hold can drop below freezing, and lost baggage means lost treatment.
- Only pack a cool bag if it will be above 30 degrees. If you do use one, keep the pen away from a frozen-solid ice pack, or you risk freezing it.
- Keep it in its original packaging, and carry a copy of your prescription or a letter from your prescriber.
- Pens, needles and medical cool packs are allowed through security. Declare them at the checkpoint if asked.
- Take a small sharps bin for your used needles, and bring it home to dispose of them safely.
- Pack a few spare needles, and order any refills early, so a delay does not leave you short.
As a general rule, you can carry up to three months’ supply for personal use, whether pens or tablets. For trips outside the UK, check your destination’s rules too, because some countries ask for prior approval or a translated prescription to bring prescription medicines in.
If you are on the oral Wegovy pill
The tablet is simpler to travel with, because it does not need refrigeration and travels at room temperature. It has its own rules, though. Keep it in its original box and blister, which protect it from moisture, and only pop each tablet out when you are ready to take it. Keep it dry, and never crush, split or chew it, because the tablet has to stay intact to work. The documentation and three-months supply rule apply just the same, and our guide to the oral pill covers how to take it.
Heat at home counts too
This is not only about flying. A UK heatwave asks the same care of you. Do not leave your pen in a hot car, in direct sun, or on a warm windowsill, even for a short while. The 30-degree ceiling applies just as much on a hot day in the garden as it does on a beach abroad.
Time zones and your weekly day
Here is where people worry more than they need to. Because these are weekly medicines, they are forgiving. Keep to your usual injection day, at a sensible time in local time, and small shifts of a few hours make no meaningful difference. A phone reminder set to your new local time helps you stay on track. The one thing to avoid is doubling up. If travel has pushed your days around, do not take two doses close together to catch up, because that tends to bring on nausea. If you are unsure what to do about a missed day, ask your prescriber rather than guess, and never stretch or ration your supply to make it fit
Eating and drinking on holiday
Travel usually means richer food, more alcohol and less routine, all of which can stir up the digestive side effects of treatment. You do not need to sit out the fun. Smaller portions, pacing yourself at the buffet, and keeping water to hand go a long way, and the same flexible, enjoy-it-but-stay-consistent approach that works at home works just as well abroad.
Heat also makes hydration matter more, and these medicines can dull your sense of thirst, so keep drinking even when you do not feel it.
If something goes wrong
If you think a pen has been too hot, has frozen, or has been left out of range for too long, do not inject it. Heat damage cannot always be seen, so speak to your prescriber or pharmacy before continuing, rather than taking the risk. If a pen is lost or you run short away from home, contact us or a pharmacy for advice. One thing to avoid entirely is buying replacement pens from unverified sellers abroad, because you cannot be sure what you are getting, or how it has been stored.
Where we can help
A little planning is all it takes. Heading off this summer and want a travel letter for your medication? We can sort that. And if you are unsure how to store or time your doses while away, that is exactly what we are here for. You can book a consultation at www.envigore.com before you go.
Frequently asked questions
These questions reflect the guidance above and are reviewed by our clinical team before publication.
Yes. Carry it in your hand luggage, never the hold, which can freeze. Pens, needles and medical cool packs are allowed through security. It helps to keep the medicine in its original packaging, with a copy of your prescription or a letter from your prescriber.
Often you do not need to. Below 30 degrees, the pens keep for weeks at normal room temperature, so a cool bag is only needed when it will be hotter than that. Keep them shaded and out of hot cars, and refrigerate again on arrival if you can.
No. Freezing ruins these medicines, and a frozen pen must be thrown away even if it thaws and looks normal. Use a cool bag, but do not let the pen sit directly against a frozen-solid ice pack, which can freeze it.
Not really. These are weekly medicines with a few days of flexibility, so keep to your usual day at a sensible local time, and small shifts are fine. Set a phone reminder, and do not take two doses close together to catch up.
Do not use it. Heat damage is not always visible, and a frozen pen is unsafe even if it looks fine. Speak to your prescriber or pharmacy before continuing, and if you are left short, contact us rather than buying replacements from unverified sellers abroad.
The storage is easier, because the tablets need no fridge and travel at room temperature. Keep them in their original box and blister to stay dry, and never crush or split them, since the tablet must stay intact to work. The three-months limit and destination checks still apply.
+ Sources
- Wegovy (semaglutide) injection, Mounjaro (tirzepatide) and oral semaglutide Summaries of Product Characteristics and patient leaflets: refrigerated storage, in-use windows, do-not-freeze guidance, and keeping tablets whole in their original packaging.
- UK guidance on travelling with medicines and airport security for injectable medicines, needles and medically necessary cool packs.
- NHS and Fit for Travel guidance on taking prescription medicines abroad, including personal-supply limits (commonly up to three months) and checking the destination country’s import rules.
About Your Clinical Team
This content was medically reviewed and approved by Danny Gian Hou Chu, a HCPC-Registered Advance Paramedic Prescriber (PA38670), who oversees all prescribing decisions at Envigore.
All prescriptions are dispensed by Right Medicine Pharmacy, a GPhC-Registered Pharmacy (No. 9012382).
Nutritional guidance and lifestyle support is provided by Veronica Giudice, a HCPC-Registered Dietitian (DT26570) and British Dietetic Association member.
Last medically reviewed: August 2026