Travelling With Medication: Security, Doctor's Letters and Fridge Meds

Travelling with medication comes down to four habits: carry it in your hand luggage, keep it in its original labelled packaging, bring a doctor’s letter, and check the rules for anything controlled before you book. For fifteen years I have not left the house for a trip without a small dry bag of medication and a folded letter listing every item by its proper name, and that bag has smoothed more security desks than anything else I own. Sorting it is not hard, but it is the sort of thing that goes badly only when it is left to the morning of the flight. Here is the order to do it in.

Do I carry medication in hand luggage or checked baggage?

Always carry your medication in your hand luggage, in its original labelled packaging, and never rely on a checked bag for anything you cannot miss a dose of. Airlines treat medicines and medical devices as items you keep with you, and the guidance is consistent that essential medication belongs in the cabin, not the hold ¹. A checked bag can be delayed a day or lost outright, and the hold runs cold enough to spoil some medicines, so the cabin is the only safe place for the doses that matter.

The habit that has saved me more than once is splitting the supply. The bulk travels in my hand luggage, and a few days’ worth goes in a second bag carried by whoever I am with, so a single missing bag never leaves me without anything. If you also fly with a wheelchair or scooter, fold the medication conversation into the same call where you sort the equipment declarations for flying with a wheelchair, because it is all one set of arrangements with the airline.

Liquids, needles and devices through security

Essential medicines, including liquids over 100ml and the cooling packs that keep them cold, are exempt from the usual cabin liquid limit, but you must declare them at security. The standard 100ml rule does not apply to medication you need for the journey, provided you present it separately for inspection, and you may be asked to support it with a prescription or letter ². Take the medicines out of your bag before you reach the scanner, tell the officer what they are, and expect them to be checked on their own.

Needles, syringes, pumps and small medical devices go through the same way when they are declared and supported by paperwork. I keep everything liquid or sharp in one clear pouch at the top of my bag, with the letter tucked into the same pocket, so I am not digging through a case while a queue builds behind me. Allow a few extra minutes at the check, because a declared medicine is meant to be examined, and that is a good thing, not a delay to resent.

The doctor’s letter and your prescription

Carry a letter from your prescriber listing your conditions and your medicines by their generic names and doses, plus a copy of the prescription itself, because it clears security fast and answers a border officer’s questions before they become a problem. International travel guidance repeatedly recommends written documentation for the medicines you carry, especially across borders where a brand name may be unfamiliar or a drug may be viewed differently ³. The generic name is the important part, because that is what customs staff and pharmacists anywhere will recognise.

I learned the value of the generic-name letter at a desk where an officer did not know my medication by its box, read the letter, matched the names, and waved me through in under a minute. Ask your own prescriber for this letter well ahead of the trip, since it can take time to produce and may need to spell out specific drugs. It is also worth checking that your travel cover reflects the conditions the letter describes, which is covered in the travel insurance for disabled travellers guide.

Controlled drugs and crossing borders

If any of your medication is a controlled drug, check the rules for both the country you leave and the country you enter before you book, because some need a personal licence or official letter and a few are restricted or banned outright. Guidance on controlled medicines is clear that carrying a larger supply, commonly 3 months or more, can require a licence to take the drug out of your own country, and the destination may impose its own limits and paperwork ⁴. What is a routine prescription at home can be a regulated import somewhere else.

This is the one part of travelling with medication that genuinely catches people out, so give it the most lead time. Keep controlled medicines in the original pharmacy packaging with your name on the dispensing label, carry the prescription and the doctor’s letter naming them, and confirm the destination’s position in writing rather than assuming. If in any doubt about whether a medicine counts, treat it as if it does and check, because the consequences of arriving with an undeclared controlled drug are far worse than the effort of a form.

Keeping medication cold: fridge meds and temperature

Refrigerated medicines such as insulin usually need keeping between 2 and 8 degrees Celsius, so carry them in an insulated travel wallet with cooling packs and never in the aircraft hold, which can freeze and destroy them. The exemption for essential medicines covers the cool packs and gel wallets you need to hold that temperature through the cabin, and travel-health advice is firm that temperature-sensitive medication travels with you, not below deck ². A frozen dose is a spoiled dose just as surely as an overheated one.

Confirm before you go that your accommodation has a working fridge you can actually use, and ask the airline in advance about cabin options for a long flight rather than assuming crew will store anything for you. A friend who travels on insulin plans her cooling exactly as carefully as I plan a wheelchair transfer, treating the cool wallet as non-negotiable kit. The same forward planning that governs travelling with oxygen applies here: the temperature chain is only as strong as the weakest gap you failed to plan for.

How much to pack, and refills abroad

Pack the full amount the trip needs plus a generous spare, commonly several extra days or more, and do not count on refilling a prescription abroad, because it can be slow, costly or simply not possible. Government travel advice recommends taking enough medication to cover the whole trip with a margin, since sourcing a repeat overseas may run into different prescribing rules, unavailable drugs or a language barrier at the counter ⁵. The margin is not extravagance; it is what covers a cancelled flight or an extended stay.

So the final sum is simple: take more than you think you need, split it across two bags, keep it all in the cabin, and carry the paperwork that names every item. Do that, and medication stops being the thing you dread at the airport and becomes just another packed bag. The wider planning it sits inside, from insurance to equipment to medical needs, is drawn together in the practical steps of dialysis on holiday for anyone whose treatment travels with them.

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General information about the logistics of travelling with medication, not medical advice. What you may carry, in what quantity, and how to store it safely are individual matters; always follow your own prescriber’s instructions and confirm the rules with your airline and with the countries you are leaving and entering.