Can I take my prescription medication into another country?

Two separate legal systems have to be satisfied — the UK rules on taking controlled drugs out, and the destination rules on bringing anything in — and neither is decided by your pharmacy.

Difficulty: beginner
Time: 18 min
Read: 4 min
Safety: warning

Short answer

Check two things. First, whether the drug is controlled in the UK, which may require a personal licence or a prescriber letter to take out. Second, whether it is legal in the destination — ask that country's embassy in the UK, because some common UK medicines are banned abroad. Carry everything in original labelled packaging with a copy of the prescription.

People assume that a legitimate NHS prescription travels with them. It does not. Drug classification is national, and the list of UK medicines that are controlled or prohibited somewhere else is longer than most travellers expect — it includes some strong painkillers, some sleep and anxiety medicines, some attention-deficit medicines, and even some over-the-counter cold and allergy preparations.

Safety

Some medicines that are ordinary prescriptions in the UK are controlled or banned in other countries, and travellers have been arrested and imprisoned for carrying them. The only authority that can tell you whether a medicine is legal in a country is that country, usually through its embassy in the UK. Check weeks ahead, because a licence or a letter cannot be produced at an airport.

Deciding what paperwork your medication needs to cross a border

Step by step

Work out whether the medicine is controlled in the UK.Controlled drugs include far more than people assume. UK government guidance lists what needs a personal licence to take abroad, which usually depends on the drug and the quantity — a longer supply is more likely to need one. Below the licence threshold, a letter from the prescriber is still strongly advised.
Ask the destination embassy whether it is legal there.This is the step people skip and it is the one that leads to arrests. The embassy or consulate of the country you are visiting, in the UK, is the authority. Ask in writing, name the generic drug rather than the brand, and keep the reply.
Check every country on the route.A transit country applies its own law to anything in your bags, including hand luggage, even if you never leave the airport. Countries with the strictest rules on medicines are commonly transit hubs.
Get a prescriber letter.On the practice letterhead, naming you, the condition, the generic name of each drug, the dose and the total quantity being carried, and confirming it is for your own use. Ask early — practices charge for letters and need notice.
Carry everything in the original packaging.Original boxes with the dispensing label showing your name, and a copy of the prescription. Do not decant a fortnight of tablets into a daily organiser as your only supply — a loose unlabelled tablet is exactly what causes a problem at a border.
Arrange the supply early with your surgery.Getting more than the usual repeat quantity for a long trip needs the practice to agree in advance, and NHS prescribing rules limit how far ahead they will dispense. Ask well before you go and expect to discuss it.
Split it and carry it in the cabin.Essential medication goes in hand luggage, because hold bags go missing. Split the supply between two bags or two people so one loss is not the whole supply. Liquids, needles and pens need the prescription or letter to satisfy security.
Plan the storage.Insulin and some other medicines must not freeze or overheat. Work out how they will be kept in transit and at the destination — a cool bag for the journey and a fridge on arrival, not a car glovebox.

Tips

Take a photograph of every box and the prescription, and store it where you can reach it without your phone. If the medicine is lost, a clinician abroad needs the generic name and dose, not the brand.
Time zones change dosing schedules for anything time-critical. Ask the pharmacist how to shift the timings for the outbound and return flights before you go.
Buying a replacement abroad is not always straightforward: the same drug may be a different strength, a different name or unavailable. Carry more than you strictly need, within any licence limit.

Common mistakes

Assuming a UK prescription makes it legal anywhere — Drug law is national. A UK prescription is evidence of legitimate personal use, but it does not authorise import into a country where the substance is prohibited.
Packing all the medication in the hold — A delayed bag becomes a medical problem rather than an inconvenience, and hold conditions are wrong for some medicines.
Leaving the licence or letter until the last week — A personal licence application takes time to process and a prescriber letter needs a practice appointment. Neither can be obtained at short notice.

Questions people ask

Which everyday medicines are most often a problem?

Strong opioid painkillers, some sleeping tablets and anxiety medicines, medicines for attention-deficit conditions, and in certain countries some ordinary cold, allergy and codeine-containing preparations. Ask the embassy rather than working from a list, because they change.

Do I need to declare medication at customs?

Where a country requires it, yes, and the paperwork is what makes that straightforward. If in doubt, declare — declaring something permitted costs you a few minutes, failing to declare something restricted is an offence.

What about cannabis-based products prescribed in the UK?

These are among the most likely to cause serious trouble abroad, including in countries with liberal domestic rules. Check with the destination embassy specifically and do not assume.