Travelling with prescription medication

title: "Travelling with prescription medication" description: "The documentation that lets prescription medicines cross most borders, the controlled substances that need extra authorisation, and the destinations that refuse common medicines." category: "traveling" estimatedReadMinutes: 7 lastUpdated: "2026-05-16"

Carrying prescription medication across a border is allowed almost everywhere — if it's for personal use, in reasonable quantities, with the right documentation. Below is what "right" means in practice, plus the categories that need more than the default approach.

The default approach

For ordinary prescription medication (blood pressure, cholesterol, insulin, antibiotics, allergies, asthma inhalers, ordinary antidepressants):

• Carry the medication in its original packaging with the pharmacy label intact.
• Carry a copy of the prescription (paper or PDF on phone is fine in most places).
• Carry a doctor's letter stating the medication, dose, condition, and your name. Re-issued annually is generous, every 2 years is the minimum useful.
• Quantity: 30–90 days' supply is widely accepted. More than 90 days starts to look commercial.
• For travel longer than 90 days, split the supply across travel and a destination pharmacy plan.

That bundle clears customs at virtually every modern airport without an issue.

Controlled substances

Some medications are controlled in many or all jurisdictions:

• Opioid painkillers — codeine, tramadol, oxycodone, hydrocodone, morphine, fentanyl.
• Stimulants — methylphenidate (Ritalin), amphetamines (Adderall, Vyvanse), modafinil.
• Benzodiazepines — alprazolam (Xanax), diazepam (Valium), clonazepam, lorazepam.
• Z-drugs — zolpidem (Ambien), zopiclone.
• Cannabis-derived medicines — even where prescribed, illegal to import in many countries.
• Anabolic steroids — testosterone, including legitimate hormone replacement.

For controlled substances, the default approach is not enough. You generally need:

• A pre-arrival permit from the destination's health authority.
• For some destinations, you must declare in advance via an online form.
• For some, you may need to ship via a customs broker rather than carry.

Specific cases:

• Japan — many common Western prescriptions (Adderall, Vyvanse, even certain cold medicines) require a Yakkan Shoumei certificate, applied for 2-4 weeks before arrival. See our Yakkan Shoumei step-by-step.
• Singapore + UAE — strict controls on opioids, benzodiazepines, codeine-containing medicines. Pre-approval required.
• Saudi Arabia — additional rules including a Ministry of Health import permit for controlled substances.
• China — small quantities for personal use accepted with prescription; controlled substances need pre-approval.

OTC medicines that cause border problems

Several common over-the-counter medicines are restricted:

• Sudafed (pseudoephedrine) — restricted or prescription-only in many destinations.
• Codeine combinations (paracetamol + codeine, ibuprofen + codeine) — controlled in most jurisdictions.
• Melatonin — OTC in the US, prescription-only in many European countries; carrying it from the US to the EU can be fine in small personal quantities, but commercial quantities are not.
• CBD products — even legal-where-purchased CBD can be illegal at the destination.

Insulin and refrigerated medicines

• Insulin pens / vials are routinely allowed in carry-on. TSA / equivalent allow ice packs for diabetics.
• For refrigerated medicines, request a refrigerated medication letter from the airline; most accept these aboard.
• Bring twice as much as you expect to need — flight delays add up.

Medical devices

CPAP machines, nebulisers, blood-glucose meters, EpiPens — all routinely allowed in carry-on with a doctor's letter. Most airlines do not count medical devices toward the carry-on allowance.

Practical checklist

1. Decide if any of your medication is a controlled substance at the destination.
2. For controlled substances, start the pre-approval process at least 4 weeks ahead.
3. Carry medication in original packaging in your carry-on (never checked baggage).
4. Carry the prescription and doctor's letter, both in paper.
5. Limit quantity to 30–90 days' supply per traveller.
6. Declare on arrival if you are carrying anything controlled or if quantity is high.

When the destination prohibits your medication

If your medication is outright prohibited at the destination, you need to plan ahead with your prescribing doctor for a substitute, or arrange care at the destination. Most countries have an emergency-supply route through their health system; ask before travel rather than at arrival.

Useful next reads

• Japan Yakkan Shoumei step-by-step.
• Traveling with medication guide.
• Item profiles for specific medications.

Not legal or medical advice. Verify with both your prescribing doctor and the destination's health authority before travel.