Travelling with prescription medicines

By the Viamo editorial team · Editor Terje Moy · Last updated July 2026 · 5 min read

Most prescription medicine crosses borders without any fuss — pack it, declare it if asked, and carry on. But rules vary more than travellers expect, particularly for controlled substances, injectable medication and long-term supplies, and getting caught out at a border with the wrong paperwork can mean confiscation or worse. Here's what to actually check before you travel.

The basics: what almost every traveller should do

• Keep medicines in their original, labelled packaging rather than transferring pills into a pillbox or unlabelled container — this is the single most useful thing you can do to avoid questions at security or a border.
• Carry medicines in hand luggage, not checked baggage, both because checked bags can go missing and because some medicines (insulin, biologics) can be damaged by the cold, unpressurised hold.
• Bring more than you think you'll need, within reason, in case of travel delays — but be aware that quantity limits do exist in some countries for controlled medicines specifically.
• Carry a copy of the prescription alongside the medicine, ideally with the generic (chemical) name as well as the brand name, since brand names vary hugely between countries.

Doctor's letters: when you need one and what it should say

For anything beyond common over-the-counter-style medication, a doctor's letter is worth having even where it isn't strictly mandatory. A good letter states your name, the medical condition being treated, the medicine's generic name and dosage, and confirms it is prescribed for your personal use. For controlled substances, injectable medicines (including insulin and EpiPens), or large quantities for a long trip, many countries expect this letter as standard, and airport security in some countries will ask for it even for routine medicines like insulin pens or syringes.

Ask your doctor or pharmacist to prepare this well ahead of travel — during a routine appointment is far easier than requesting an urgent letter close to departure. Some countries additionally require the letter to be translated, notarised, or accompanied by an import permit for specific drug categories; check the destination country's embassy website or health ministry for anything beyond routine medication.

Controlled drugs need extra care

Medicines classified as controlled substances — a category that includes many strong painkillers (including some opioids), certain ADHD medications like methylphenidate, and some anxiety or sleep medications — are treated very differently from country to country. A medicine that is a standard prescription at home can be a banned or tightly restricted substance elsewhere, occasionally with serious legal consequences for possession without the correct paperwork. Some countries require an import permit or advance notification to bring in specific controlled medicines, applied for through their embassy or health ministry, sometimes weeks in advance.

Injectable medicines and medical devices

Insulin, EpiPens, injectable biologics and similar medical equipment usually travel fine in hand luggage with the original packaging and a doctor's letter, and most airlines and airport security worldwide are well accustomed to these. It's still worth notifying security ahead of the scanner if you're carrying needles or an insulin pump, and checking your specific airline's policy on carrying liquids above the usual security limits for medical reasons, since medical exemptions typically exist but sometimes require advance notice or documentation at the gate.

Cold chain and storage during transit

Some medicines — insulin among the most common — need to stay within a specific temperature range. A basic insulated travel case or cool pack, kept in hand luggage rather than checked, is the standard solution, and most are compact enough to pass through security without issue. Avoid leaving temperature-sensitive medicine in a hot car, direct sun, or a hold baggage compartment, all of which can expose it to temperature extremes well outside safe storage ranges.

What to declare, and where

Customs declaration requirements for personal medicine vary by country, but a useful default is: if a country's customs form asks whether you're carrying medication, answer honestly, and if in doubt, declare it — a brief conversation with a customs officer about a legitimately prescribed medicine, backed by original packaging and a letter, is a minor inconvenience; being found with undeclared controlled medication is a much bigger problem. See our guide on what you can't bring through customs for how customs declarations generally work.

Practical checklist before you travel

• Confirm your destination's rules for your specific medicine — not general advice — via its embassy or health ministry website.
• Get a doctor's letter for anything beyond routine, common medication, well ahead of your trip.
• Keep medicine in original packaging, in hand luggage.
• Carry enough for the whole trip plus a reasonable buffer, and split supplies between different bags if travelling with a companion, in case one bag is lost.
• Check both your outbound destination's rules and those of any country you're transiting through, since transit rules can differ from entry rules.

Frequently asked questions

Do I need a doctor's letter for ordinary medicines like blood pressure tablets?

Usually not strictly required, but it does no harm to have one, and original packaging with the prescription label is normally sufficient for common, non-controlled medication.

Can I bring insulin and needles in hand luggage?

Yes, this is standard and well understood by airport security worldwide. Keep it in original packaging, carry a doctor's letter, and it's worth notifying security staff before the scanner.

What happens if my medicine is classed as a controlled substance somewhere?

Requirements range from carrying a doctor's letter to needing an advance import permit, and in rare cases the medicine may simply not be permitted. Always check directly with the destination country's embassy well ahead of travel.

Should I carry medicine in checked baggage or hand luggage?

Hand luggage, wherever possible — checked baggage can be lost or delayed, and the hold can expose temperature-sensitive medicines to damaging conditions.