Of everything you pack for a flight, the one thing you cannot buy at the airport at two in the morning is your own prescription. A charger, a toothbrush, even a passport photo can be replaced somewhere between the gate and the hotel. Insulin in the right strength, a CPAP machine fitted to your face, an inhaler that actually works for you, a pen that has to stay between two and eight degrees: those cannot. 💊✈️
And yet medication is the category where travellers improvise most. People drop tablets into a sandwich bag, put the blister packs in the suitcase “because it is lighter”, forget that the hold is not a pharmacy fridge, or discover at the security lane that a bottle of liquid medicine is suddenly a question mark. Most of these problems are avoidable, and none of them requires anything exotic: a bit of paper, the right bag, a call to the airline a week before, and a habit of thinking about the journey as a chain of places where something can go wrong.
This guide walks through ten rules for flying with prescription medicine, insulin, injectables and common medical devices, written for the 2026/27 travel season and for people flying within and out of Europe. It is practical rather than medical: it will not tell you what to take, only how to get it there intact. The rules are grouped in three stages, before you pack, at security, and in the air and at the destination, and in the middle you will find two blocks with the hard cases we would actually use for this. A short checklist and a FAQ close the article. 🧳
One honest note before we start. Rules on medicines differ by country, by airline and sometimes by individual airport, and they change. Everything below describes the general principles we could confirm at the time of writing, and where a rule varies we say so. Your doctor, your pharmacist, your airline's special-assistance desk and the official pages of the countries on your route always overrule a blog post, including this one.
Part 1: Before you pack ✅
1. Plan the quantity: the whole trip, plus a buffer, split in two 🗓️
Start with arithmetic, not with the bag. How many days are you away, and how many doses a day? Add the days of the outbound and return journeys, then add a buffer for delays. A cancelled flight, a missed connection or a closed airspace can turn a three-night trip into a five-night one, and the buffer is what separates an inconvenience from an emergency. Many travellers add a few extra days of supply, and for medicines you cannot interrupt, a week is a sensible margin on longer trips. Your doctor can tell you what is reasonable for your condition.
Then split the supply. The classic advice is to divide essential medicine between two bags that travel separately: one with you, one with a companion, or one in the cabin bag and a smaller reserve in your jacket or personal item. The point is not paranoia. It is that a single lost, stolen or confiscated bag should never take your whole supply with it. If you travel alone, the second location can simply be the personal item under the seat versus the overhead bin.
What you should not do is put any part of the working supply in checked baggage. Hold luggage can be delayed, rerouted or lost, and as we explain in our guide to what can go in the hold, it also experiences temperature swings and rough handling that medicine labels were never written for. Anything you need within 24 hours of landing stays with you. 🎒
Finally, check the supply against the destination, not only against the journey. If you are going somewhere remote, or somewhere where your brand is not sold, the buffer matters even more. A pharmacy abroad may stock an equivalent, but not necessarily the same active ingredient in the same strength, and you do not want to negotiate that in a language you do not speak.
2. Take the paperwork: prescription, doctor's letter, device card 📄
The most useful object in your medical kit weighs nothing. A printed prescription or a short letter from your doctor on headed paper, giving your name, the medicine (preferably the generic name, not just the brand), the dose and the reason you need it, answers most questions in a few seconds. Security staff and customs officers do not need to be convinced that you are ill; they need to see that the medicine is yours and that the quantity matches the trip.
For injectables, add a line saying that you carry needles, syringes or pens for medical use. For devices such as insulin pumps, continuous glucose monitors, neurostimulators or implanted pacemakers, carry the manufacturer's device card if you have one, and a copy of the letter in the language of the country you are visiting if it is not widely spoken in English. A letter in English is usually enough at major airports, but a short translation costs very little and can help at smaller ones.
Put the documents where you can reach them without unpacking: a flat pocket in the lid of your case, or the document slot of your cabin bag. A lid organiser is useful here because the papers are visible the moment the case is opened. Take a photo of everything and keep it on your phone as well, but do not rely on the phone alone, since batteries die at the worst possible moment. 📱
A word on controlled substances. Some strong painkillers, sedatives, ADHD medicines and sleep medicines are classed as narcotic or psychotropic, and they are the ones that cause genuine trouble at borders. Within the Schengen area the standard tool is the certificate provided for under Article 75 of the Schengen Implementing Convention. As we understand the national guidance published by medicines agencies, it is issued or authenticated by the competent authority of your home country, it covers one substance per certificate, and it is valid for a maximum of 30 days. Rules for which authority issues it differ by country, and travel outside the Schengen area is governed by the destination's own law, so ask your doctor and your national health authority well ahead of time, not at the airport.
3. Tell the airline early, especially for devices and oxygen 📞
Airlines treat medicine and medical devices as a service topic, and most of them have a special-assistance desk that deals with it. A short email or call a week or two before departure is enough for ordinary medication. For anything with a battery, a gas cylinder or a moving part, such as a portable oxygen concentrator, a nebuliser, or a CPAP machine with a battery pack, it becomes necessary, because airlines have their own approval lists and forms and not all of them accept every model.
Two things are worth asking in writing. First, whether the device counts as part of your cabin baggage allowance. Many carriers carry medical devices in addition to the normal allowance, but the policy is the airline's, not a law of nature, and the answer can differ between a full-service carrier and a low-cost one. Second, what they need to see at the gate: a letter, a form, a battery specification. Keep the reply on your phone and on paper.
If your device has a lithium battery, learn its watt-hour rating, which is printed on the battery or in the manual. Most airlines apply the general rule for passengers: batteries up to 100 Wh are accepted without a special procedure, larger ones up to a higher limit need airline approval, and spare batteries travel in hand luggage only, with their terminals protected against short-circuit. The same logic applies to power banks, which we cover in our power bank guide. Check your own airline's wording rather than relying on the general rule.
The earlier you ask, the more room you have for an answer you do not like. A refusal two weeks before departure is a problem you can solve. A refusal at the check-in desk is a cancelled holiday.
Part 2: At security 🔍
4. Liquids: medicines are treated differently, but you have to show them 💧
Under the European aviation security rules, liquid medicines needed during the journey are exempt from the 100 ml limit for hand luggage. The practical reading, repeated on the websites of several airports and airlines, is that you may carry the quantity you need for the trip, in the original packaging where possible, and that you should be ready to prove that the medicine is yours. You are expected to present it separately from the transparent bag with your ordinary toiletries, not mixed into it.
That last sentence is where most people trip up. Laying out the medicine in its own tray is not an accusation that something is wrong; it is the expected procedure and it makes the check faster. Keep the packaging with the pharmacy label, keep the leaflet if it is small, and keep the prescription or letter on top. A single liquid medicine in an unlabelled bottle is the situation to avoid, because there is nothing left to decide the question except the officer's judgement.
Airports also change their screening equipment. Some European airports now operate CT scanners at the checkpoint and have relaxed the rules on removing liquids and electronics, while others keep the old procedure, and the details can differ between terminals of the same airport. Our article on how liquid limits work at different airports explains why you can pass one checkpoint with a full bag and be asked to unpack at the next. The medicine exemption does not depend on the scanner, but your tray habits do.
A small practical tip: pack the medicine in a case or pouch that opens fast and closes fast, with a flat lid you can place on the tray. Spilled tablets on a security belt, with a queue behind you, is the kind of small humiliation that a decent organiser prevents. 😅
5. Needles, syringes, pens and sharps: declare calmly, pack safely 💉
Needles and syringes for medical use are accepted in hand luggage on most routes when you can show that you need them, which is another reason for the doctor's letter. Insulin pens, pre-filled injectors, lancets and pen needles are the everyday versions, and security staff see them every day. What helps most is the same thing as before: original packaging, a label with your name, a note or prescription, and a quick, polite mention at the checkpoint.
Think about the return trip as well. Used sharps need a place to go. A small rigid sharps container, or a thick plastic bottle with a screw cap, travels better than a loose bag, and it is worth asking your pharmacy what they recommend. Do not throw a used needle into the bin of an airport lounge, a hotel room or a train, because the person who empties it is not part of your treatment plan.
Inside the bag, give needles a place that cannot snag your hand when you reach in. A hard shell with a fitted insert is excellent for this. A cabin case with a lid organiser, or a small rigid case inside the main compartment, keeps pens upright and needles capped and stops everything from rolling into a corner. The same property that protects a camera lens protects a glass cartridge: stiff walls, no crushing, no sharp objects pushing through fabric. 🛡️
In the air, remember that pressure changes affect some pens and cartridges, causing small air bubbles or a few drops to be pushed out. Your diabetes team or pharmacist will know the routine for your device, and it is worth rehearsing it at home before the trip rather than in seat 31C.
6. Pumps, sensors and implants: ask before you walk through a scanner 🩺
People who wear an insulin pump or a continuous glucose monitor often ask whether they can go through the body scanner or the x-ray. The honest answer is that guidance differs. UK government guidance on aviation security says that these devices should not be passed through an x-ray or a body scanner and that staff should use an alternative method, such as a hand search, which can be done in private. Several device manufacturers say that their products are designed to cope with common airport systems, and others advise to remove them or request a manual check. The consistent part is the advice: tell the officer about the device before you enter the scanner, and ask for the alternative screening if your manufacturer recommends it.
The same applies to implanted devices. A pacemaker or neurostimulator card from the clinic is your friend, as is a few minutes of patience. If you wear a pump on your body, a calm sentence at the beginning, “I wear an insulin pump and I would like an alternative screening, please,” usually leads to a polite hand search and a short wait.
Spare supplies for such devices, such as extra sensors, infusion sets and reservoirs, should travel with you in the cabin, because they are exactly the items that are hard to replace abroad. Pack them in a rigid, dry container, away from the heat of a window seat or a coat pocket and away from anything sharp. In our experience, people discover how much a sensor is worth only after it has been squashed under a laptop. 🔋
Finally, put the contact details of your clinic and the manufacturer's helpline on a card in the same case. If something fails at the destination, you will want to ask for a replacement without searching your email for the phone number.
Part 3: In the air and at the destination 🛫
7. Temperature: the hold is not a fridge, the window seat is not a cool box ❄️
Many medicines have a storage range printed on the packaging, and some of them, such as many insulins, GLP-1 pens, biologics and certain eye drops, are intended for refrigeration before first use. Cabin crew cannot store or refrigerate your medicine for you, as several airlines state in their guidance, so the cooling has to come with you. That means an insulated pouch or a small cool bag with frozen gel packs, and a plan for how the pack will stay frozen during the security queue and the flight.
Ice packs are a security topic on their own. In practice, many airports accept frozen gel packs for medicine when they are solid at the checkpoint, and some do not, so ask the airport or airline in advance and carry the letter that explains what the pack is for. Another approach used by travellers is a cooling wallet that uses an evaporative or activated material and does not need freezing, but check whether your medicine tolerates it, because some are better at keeping things cool than at preventing freezing, and freezing is as damaging to some preparations as heat.
Do not leave medicine in the seat pocket in strong sunlight, on a hot car dashboard on the way to the airport, or in a coat pocket by the aircraft window. Do not leave it in checked luggage at all. The hold of a modern aircraft is generally kept above freezing, but you cannot verify that on your flight, and you cannot verify how long the bag sits on a hot apron before loading. For anything temperature-sensitive, the cabin is the only controlled place you can personally watch. 🌡️
At the destination, move the medicine into the hotel or apartment fridge as soon as you arrive, and if the room has none, ask reception before you need it. A tiny thermometer in the cool bag, readable without opening it, is an inexpensive way to turn “I think it was fine” into “I know it was fine”.
8. Delays, cancellations and long layovers: your buffer in action ⏳
Most travellers think about medicine as something to carry through the airport, but the real test arrives when the plan breaks. A snowstorm closes the airport, a connection is missed, a strike turns a short hop into a night in a terminal. If you have followed rule 1, you have the doses; what you need now is a way to take them on schedule and keep them safe while the itinerary is rewritten.
The first habit is to set medication alarms in home time and local time, and to decide in advance which one you follow. For time-critical medicines, such as insulin, anti-epileptics and anticoagulants, ask your doctor how to shift the schedule across time zones, and write the answer down. The second habit is to keep the whole kit within reach in the cabin bag, not in a bag that the airline might gate-check at the last minute. That scenario is common enough on full flights that we wrote a separate guide on what to pull out of your bag first when it happens; the medicine pouch is item one on that list.
If your flight is cancelled, tell the airline staff about a time-critical medical need. They cannot promise miracles, but they can sometimes prioritise rebooking or direct you to a lounge with a fridge. If you are stuck overnight, hotels usually have a fridge or can find one, and airport medical points exist at the larger hubs. Our guide on the first hour after a cancellation covers the logistics; the only thing to add here is that your first call should include the sentence “I have medicine that cannot wait”.
Long layovers deserve a plan too. If you leave the airport, take the kit with you rather than using a left-luggage locker, and avoid leaving anything temperature-sensitive in a locker at all.
9. CPAP, nebulisers and oxygen: devices that fly with their own rules 😴
A CPAP machine is a medical device, not a gadget, and airlines generally treat it that way, but the details vary. Many carriers allow a CPAP in addition to the normal cabin baggage allowance, some ask you to notify them, and a few have rules for battery-powered or humidifier-equipped units. Always carry it in the cabin: it is fragile, expensive, and a trip of several nights without it is miserable. Hold luggage is the wrong place for a device with a delicate humidifier chamber and a motor.
Empty the water chamber before security, pack the hose and mask separately in a clean bag, and bring a European or universal power adaptor with you. If you want to use the device in the air, the airline must allow it, and you need to know the seat power situation, since many economy cabins have no socket, and an aircraft socket will not necessarily supply what the device needs. For a night flight, a battery pack may be the only answer, and its watt-hour rating is back on the list of things to check with the airline.
Portable oxygen concentrators are a different category: airlines require advance notice, a medical statement, and in many cases only models from their approved list, with enough battery for the flight plus a margin. Do not leave this to the last week. Compressed oxygen cylinders are usually not accepted in the cabin at all.
Inhalers and nebulisers are simpler, but you should still carry them in the cabin, with the spacer and a spare, and keep the prescription label visible. A hard case helps with the least glamorous part of any respiratory kit: tubing, masks and filters that stay clean only if they are kept apart from everything else in your bag. 🫁
10. At the destination: replace, store and never improvise 🏨
Arrival does not end the logistics. Check the medicine after the journey, before you need it: has the pen cartridge frozen, has the tablet strip been crushed, is the label still readable. If something looks wrong, do not use it and do not guess; call your doctor or the manufacturer's helpline, or visit a local pharmacy. In most European countries a pharmacist is a trained professional who can help find an equivalent, and having your generic name and dose on paper makes the conversation easy.
Store the kit in one place, the same place every day, so that a tired traveller on the fourth night does not wonder where the pen went. A rigid case with a fitted organiser is a good habit for exactly this reason, and it travels from the airport to the room to the beach bag without being repacked. A lock is useful in shared accommodation, in hostels, and on boats; a medicine case does not need to advertise what is inside.
Keep a log of doses if you are changing time zones, since jet lag is exactly the situation in which people forget whether they have already taken the evening tablet. A pill organiser with days printed on it takes five seconds to fill at home and removes the question. For the return journey, leave yourself a margin again; the airport is the one place where you cannot call a friend to bring a spare box.
And if the worst happens, a lost bag, a stolen backpack, a case left in a taxi, you will be glad you split the supply, carried the documents separately and took photos. A replacement prescription abroad is far easier when you can show what you were taking and for how long. Our guide to filing a claim for lost luggage will help with the rest, although it will not solve the medicine problem, which is why rules 1 and 2 come first.
🎒 Cabin cases for the medicine kit, documents and devices
Packing it all: one kit, three layers 🧰
If you read the ten rules as a system, a pattern appears. The medicine kit has three layers. The inner layer is the medicine itself, in original packaging, with its label and leaflet. The middle layer is the protection: a rigid pouch or case, cooling if needed, a sharps container, a fitted insert so that nothing moves. The outer layer is the paperwork and the plan: prescription, letter, device card, airline confirmation, doses written down. Lose any layer and the kit still works, as long as the others are intact; lose all three and you are improvising at a foreign airport.
The same thinking applies to the case you choose. A hard shell is not a medical product and no one should claim it makes a medicine safe; it cannot warm, cool or sterilise anything. What it does is the boring, valuable work of keeping a bag from being crushed in an overhead bin, keeping rain off a pen, and letting you close the lid on a lock in a hostel. For a person who flies with a CPAP, a pump and a week of supplies, a cabin hard case with a laptop-style lid organiser and a fitted base is a simple way to keep the kit in one place from the kitchen table to the hotel nightstand.
For longer trips, families and anyone moving a bigger share of their life, the second block shows the checked-baggage side of the equation. We keep the hold for clothes, shoes, spare chargers and anything that can be replaced, and the medicine never leaves the cabin. But a robust hard suitcase in the hold is what protects the things that you cannot carry on, and it makes the whole journey calmer, because you are not worrying about the bulk while you manage the essentials. ✈️
🧳 Checked-baggage cases for the rest of the trip
Checklist: medicine and devices on a flight ✔️
Four weeks to two weeks before:
- ☐ Count doses for the whole trip, add a buffer for delays, and split the supply between two bags.
- ☐ Ask your doctor for a letter with generic names, doses and a line about needles or devices.
- ☐ For narcotic or psychotropic medicines, ask about the Article 75 certificate or the destination's own rules.
- ☐ Email or call the airline about devices, batteries, oxygen and CPAP, and keep the reply.
- ☐ Look up the watt-hour rating of every battery and write it down.
The day before:
- ☐ Medicine in original packaging, labels visible, in the cabin bag only.
- ☐ Cooling pouch and frozen gel packs ready, thermometer in the pouch.
- ☐ Documents printed and photographed, device cards in the same pocket.
- ☐ Sharps container, spare pen needles, spare sensors, spare batteries in hand luggage.
- ☐ Medication alarms set in home time and in local time.
At the airport:
- ☐ Medicine in its own tray, separate from the toiletries bag.
- ☐ Tell the officer about pumps, sensors, implants and ask for alternative screening if your manufacturer advises it.
- ☐ Keep the kit within reach if the cabin bag is gate-checked, and take it out first.
On arrival:
- ☐ Check the medicine for damage, freezing or heat before use.
- ☐ Move cold-chain medicine into a fridge straight away.
- ☐ Keep one fixed place for the kit and a log of doses across time zones.
FAQ ❓
Can I take more than 100 ml of liquid medicine in my hand luggage?
Under the European rules as published by airports and airlines, liquid medicines needed for the journey are exempt from the 100 ml limit, but you should carry only the quantity you need, in original packaging, present them separately at security and be ready to show a prescription or letter. Rules outside Europe differ, so check the airport at each end of your route.
Can I carry insulin in checked baggage?
We would not. Hold luggage can be delayed or lost, you cannot control the temperature, and you cannot access it if the flight is diverted. Keep insulin and other time-critical medicines in the cabin, in a cooling pouch when needed.
Do I have to tell security that I wear an insulin pump or a sensor?
It is strongly advisable. Guidance differs by country and by manufacturer, and some official guidance says these devices should not go through x-ray or body scanners. Tell the officer before you enter the scanner and ask for alternative screening if your device maker recommends it.
Does my CPAP count as a cabin bag?
It depends on the airline. Many carriers carry medical devices in addition to the standard cabin allowance, but not all, so ask in writing before you travel and carry the confirmation.
What if the airline gate-checks my cabin bag with my medicine inside?
Take the medicine pouch and documents out before you hand over the bag, and keep them in a jacket pocket or personal item. This is the single most important item on any gate-check list.
In short 🏁
Flying with medicine is mostly paperwork and habits. Count the doses and add a buffer, split the supply, carry everything in the cabin, take a letter and the original packaging, tell the airline about devices early, tell security about pumps and sensors before the scanner, keep cold medicine cold with your own equipment, and plan for the day when the itinerary breaks. None of this is difficult, and all of it is cheaper than a night in a foreign emergency room.
If you are putting together a travel kit, a rigid cabin case with a fitted organiser is a calm place to keep it, and a sturdy hold case keeps everything else out of the way. Before you fly, read what gets confiscated most often at European airports and, if your plans are tight, our guide to a missed flight. And as always: your doctor, pharmacist and airline have the last word. Safe travels. ✈️
