Bringing Medicines to Britain

Published 28 September 2026 · By the Guide to London editorial team · Editor: Terje Moy

You may bring up to three months' supply of your own prescription medicine into the United Kingdom. If any of it contains a controlled drug, it must travel in your hand luggage, and if you are not a UK resident you must carry a letter proving it was prescribed for you. Without that letter it can be taken away from you at the border.

Most visitors never think about this and most are fine. The problem is that "controlled drug" in British law covers a wider set of ordinary medicines than people expect: some strong painkillers, some sleeping tablets, some anxiety medication and some ADHD medicines that are routine prescriptions elsewhere. The rules come from the Home Office rather than the NHS, and they are enforced at the border.

This page sets out what GOV.UK says you may carry, what needs a letter, what needs a licence, and what to do if you have left your medicine at home. It is a summary of official rules, not medical advice: anything about your own treatment is a question for your own doctor or pharmacist. our page on the British pharmacy counter covers what it can and cannot do once you are here.

The three-month limit, and why it is the rule that catches people

GOV.UK is explicit: you can only bring up to three months' supply of your medicine with you. That is not a guideline about reasonable quantities. Bring more than three months, or have more posted to you afterwards, and GOV.UK says it will be taken away.

Most tourists are nowhere near the limit. The people who hit it are on long trips, visiting family for a season, or carrying a year's supply because their own system dispenses that way. If you are one of them, you have two options: bring three months and get the rest prescribed in Britain, or apply for a personal licence.

Getting it prescribed here means seeing a UK doctor or pharmacist, including for medicines that are not licensed in the UK, and GOV.UK warns that you may have to pay. That is a real cost rather than a formality, and it is worth pricing before you travel. Our page on healthcare for visitors explains which parts of the NHS are free to everyone and which are charged at 150 per cent of the national rate.

The licence route exists for exceptional circumstances and is handled by the Home Office's Drug and Firearms Licensing Unit. It is not a quick process, so start it weeks rather than days before you fly.

What counts as a controlled drug here

This is the part worth checking properly, because the answer is not intuitive and the consequences are real. GOV.UK's instruction is to ask your own doctor or pharmacist whether your medicine contains a controlled drug, and then to check the active ingredients printed on the packaging against the published controlled drugs list.

Two things about that list are worth knowing. It names drugs, not medicines, so you are looking for the chemical name on the box rather than the brand you know. And a medicine sold freely in a pharmacy in one country can contain a drug that is controlled in Britain, which is how visitors end up surprised at the airport rather than careless.

The categories that most often turn out to be controlled include strong opioid painkillers, benzodiazepines and related sleeping tablets, stimulant medicines used for ADHD, and some treatments for epilepsy and anxiety. We are not going to publish a list of brand names, because getting one wrong would be worse than useless. Check the box against the official list, and ask the pharmacist who dispensed it.

The letter, and exactly what it has to say

If you are not a UK resident and your medicine contains a controlled drug, GOV.UK requires you to carry a letter of proof that it was prescribed for you. The page lists four things the letter must contain, and a letter missing any of them is not doing its job:

• your name
• the dates you are travelling to or from the UK
• a list of your medicines, including how much you have, the doses and the strength
• the signature of the person who prescribed them

Note the second item. The letter has to name your travel dates, so it cannot be a generic letter written a year ago and reused. Ask for it when you book, in English or with an English translation attached.

Ask for two copies as well. One travels in your hand luggage with the medicine; the other stays in your suitcase or is photographed on your phone. A letter lost with a bag is a letter you do not have.

Schedule 1: the category you cannot bring at all

Some drugs sit in schedule 1 of the British system, and these cannot be brought into the UK without a licence. GOV.UK says licences for schedule 1 drugs are limited to research or other special purposes, which in practice means a visitor will not get one for personal use.

There is one detail here that trips up travellers from the European Union in particular. A Schengen certificate, which lets you carry controlled medicine between Schengen countries, cannot be used to bring schedule 1 drugs into the United Kingdom. Britain is not in the Schengen area and does not recognise the certificate for that purpose.

If your medicine falls in schedule 1, the only correct step is to contact the Drug and Firearms Licensing Unit before you travel, and to do it early enough that the answer arrives before your flight does.

Cannabis-based medicine, and being careful about it

This is the question we are asked most often and the one where we will say least, because it depends entirely on the exact product and on your own prescription. Cannabis-based products for medicinal use are a specific legal category in Britain and are not the same thing as cannabis bought legally in another country, however it was labelled there.

A product that is legal to buy in a shop in Canada, several American states or parts of Europe may be a controlled drug at the British border, and the fact that it was sold openly where you bought it makes no difference. If your treatment involves anything of this kind, write to the Drug and Firearms Licensing Unit before you travel and take their answer with you.

That is deliberately the whole of our advice. The Home Office decides what may cross the border and your prescriber decides what you should be taking.

Replacing a prescription you left at home

It happens constantly. There is a sequence that works, and none of it is fast, so start on the first morning rather than the third.

1. Telephone your own doctor or pharmacy at home and ask them to email you a copy of the prescription or a letter naming the drug, the dose and the strength. A British pharmacist can do nothing with the brand name alone if the brand is not sold here.
2. Go to a pharmacy and ask. Pharmacists can sell a limited range of medicines over the counter, and under the Pharmacy First service in England they can supply prescription medicine for seven specific conditions without a GP. A missing repeat prescription is not one of those conditions, but the pharmacist is still the right first door.
3. Register as a temporary patient with a GP practice. The NHS allows this for a short-term visitor staying somewhere longer than a day and shorter than three months, though each practice decides whether to accept you. The consultation itself carries no charge.
4. Use NHS 111, by telephone or at 111.nhs.uk, if you cannot find a route and the medicine matters. It is free and available at all hours.

Expect to pay for the medicine itself even where the consultation is free, and expect a controlled drug to be much harder to replace than an ordinary one. The pharmacy pages on the NHS website have a finder that will locate an open pharmacy by postcode, which matters on a Sunday or a bank holiday: our guide to what closes on public holidays explains how thin that cover gets.

Packing medicine, and the other border rules it touches

Keep everything in the original packaging with the dispensing label on it. Split a fortnight's tablets into a daily organiser after you arrive, not before you fly. Take the letter, the packaging and the medicine in the same bag, in the cabin.

Liquids are a separate problem, and an airport one rather than a border one: medicines in liquid form above the usual cabin limit are normally allowed with supporting documentation, but the security rules and the size limits are the airport's, and our page on airport security and the liquid rules in Britain has them. Declare medicine at security rather than waiting to be asked. Which London airport you land at makes no difference to any of this; our comparison of the six London airports covers what does differ.

Medicine is not the only thing with a declaration rule. Alcohol, tobacco, food, cash over £10,000 and various restricted goods have their own limits, and some medicines fall under wildlife trade rules because of what they contain. Our guide to UK customs allowances covers those, including which channel to use at the airport.

Finally, put the letter and a photograph of the packaging somewhere you can reach without your luggage, because the two situations where you will want them are a bag that has not arrived and a bag that has been stolen. Our page on what to pack covers the rest of that ground, the guide to a stolen phone or wallet covers the worse case, and travel insurance and healthcare cover explains why insurance matters more here than visitors assume.

Frequently asked questions

How much prescription medicine can I bring into the UK?

Up to three months' supply. GOV.UK says that if you bring more than three months, or have more posted to you, it will be taken away. If you need more than that you must either have it prescribed by a UK doctor or pharmacist, which may cost money, or apply to the Home Office for a personal licence.

Do I need a doctor's letter to bring medicine to the UK?

If you are not a UK resident and your medicine contains a controlled drug, yes. The letter must give your name, your travel dates, a list of your medicines with the quantities, doses and strengths, and the signature of the prescriber. For medicines that are not controlled drugs, GOV.UK does not require a letter, though the original labelled packaging is still sensible.

Can medicine be confiscated at the UK border?

Yes. GOV.UK states that medicine containing a controlled drug may be taken away from you at the border if you cannot prove it was prescribed for you, and that anything above three months' supply will be taken away. That is why the letter and the original packaging matter.

Does a Schengen certificate work in the UK?

Not for schedule 1 drugs. GOV.UK says explicitly that you cannot use a Schengen certificate to bring schedule 1 drugs into the UK. The United Kingdom is outside the Schengen area and runs its own licensing system through the Home Office.

What do I do if I forgot my medicine at home?

Ask your own prescriber to email you the details, then take those to a pharmacy. If that does not solve it, you can ask a GP practice to take you on as a temporary patient, which the NHS permits for a short stay of over a day and under three months, or call NHS 111 free at any hour. The consultation carries no charge; the medicine itself usually does.

Sources

• GOV.UK - Take medicine in or out of the UK (checked September 2026)
• Home Office - Controlled drugs list (checked September 2026)
• Home Office - Controlled drugs personal licences (checked September 2026)
• NHS - How pharmacies can help (checked September 2026)
• NHS - Accessing NHS services when visiting from abroad (checked September 2026)
• NHS - Find a pharmacy (checked September 2026)