Traveling internationally with prescription medications requires some planning, but it’s straightforward if you prepare before your trip. Most countries allow you to bring a personal supply of medication across their borders, typically up to 30 or 90 days, as long as you carry proper documentation. If you need a refill or new prescription while abroad, you’ll need to find a local doctor, since prescriptions from your home country generally aren’t valid in other countries’ pharmacies.
What to Prepare Before You Leave
The single most important step is keeping your medications in their original, labeled pharmacy containers. The labels should clearly show your full name, your doctor’s name, the generic and brand name of the drug, and the exact dosage. Customs officials in most countries expect to see this. Loose pills in a weekly organizer can raise questions at border crossings, so keep the original bottles even if you also use a pill case for daily convenience.
Bring printed copies of all your prescriptions, and make sure they include the generic (non-brand) name of each medication. Brand names vary wildly between countries. The World Health Organization maintains a system called International Nonproprietary Names that gives every active pharmaceutical ingredient a single globally recognized name. A pharmacist in Germany or Thailand may not recognize “Lipitor,” but they’ll know “atorvastatin.” Having the generic name on paper makes it far easier to get help abroad if you run out or lose your supply.
Ask your doctor to write a brief letter on letterhead describing your medical condition and treatment plan. This is especially useful if you take controlled substances or injectable medications like insulin, but it’s a good idea for anyone on daily prescriptions. Some countries specifically require this letter for entry with certain drugs.
How Much Medication You Can Bring
Many countries allow a 30-day supply of prescription medication for personal use, though some permit more. U.S. Customs and Border Protection uses a 90-day supply as its rule of thumb for medications entering the United States, and many travelers use that benchmark when packing for outbound trips as well. The key principle everywhere is the same: bring only what you need for the duration of your stay, and be able to prove it’s for personal use.
Before you travel, check with the embassy of your destination country and any countries where you have layovers. Each country sets its own rules, and the limits can differ for controlled versus non-controlled substances. Some countries require advance permits for certain medications even in small quantities.
Medications That Are Restricted or Banned Abroad
This is where international travel gets genuinely risky. Medications that are perfectly legal and commonly prescribed in the United States can be illegal in other countries, and a valid U.S. prescription does not protect you from arrest.
The categories that cause the most problems:
- ADHD stimulants. Medications containing amphetamines or dextroamphetamine are considered illegal controlled substances in several countries.
- Opioid painkillers. Hydrocodone and oxycodone require extreme caution and advance permission in many destinations.
- Sedatives and sleep aids. Common prescriptions like alprazolam and diazepam are tightly regulated. Even zolpidem, widely used for jet lag, requires permission in some countries and is outright banned in others.
- Decongestants. Pseudoephedrine, found in many over-the-counter cold medicines, is illegal in some countries because it can be converted into methamphetamine.
- Cannabis products. Any form of marijuana, including CBD oil that may contain THC, is illegal in many countries even for medical use.
Japan is a particularly strict example. Any medication containing amphetamines is illegal there, full stop. Many over-the-counter and prescription medications common in the U.S., including drugs for pain, depression, ADHD, and certain decongestants and allergy medications, are also banned. You risk arrest for bringing in prohibited substances even with a valid prescription from your American doctor. Some medications are legal in Japan only in limited quantities or with advance government permission.
If your medication is banned at your destination, talk to your doctor before the trip about alternative treatments. Your doctor can also write a letter explaining your condition and why a specific alternative was prescribed, which can smooth things over at customs.
Getting a Prescription Filled Abroad
If you run out of medication, lose your supply, or need something new while traveling, you’ll need to see a local doctor. Foreign pharmacies generally cannot fill a prescription written by a physician in another country. The process is: find a local licensed doctor, get examined, receive a local prescription, and fill it at a nearby pharmacy.
Several resources can help you find an English-speaking doctor overseas. Your country’s embassy in the destination nation often maintains lists of recommended medical professionals who speak English. Your travel insurance provider may also locate a doctor for you as part of their assistance services. Expat communities in major cities are another reliable source of referrals.
Pharmacy regulations also vary by country. In some places, medications that require a prescription in the U.S. are available over the counter. In others, even basic medications are more tightly controlled. A local pharmacist can often point you in the right direction if you walk in with your empty medication bottle or a written prescription showing the generic drug name and dosage.
What Travel Insurance Covers
Standard domestic health insurance often provides limited coverage abroad. If you receive urgent or emergency care outside your insurer’s network, you may need to pay the full cost upfront and file a claim for reimbursement later. Kaiser Permanente’s policy is typical of major U.S. insurers: they cover commonly prescribed acute care medications from urgent or emergency visits abroad, but maintenance medications for conditions like high blood pressure, diabetes, or high cholesterol are not included in that benefit. You’d pay out of pocket and submit a reimbursement claim.
Dedicated travel insurance policies often provide broader coverage for medical emergencies abroad, including prescription costs. If you take daily medications, it’s worth reviewing whether your policy covers lost or stolen prescriptions and medication refills, not just emergency care. Some policies also include a 24-hour assistance hotline that can help you find a local physician and pharmacy.
A Practical Pre-Trip Checklist
- Contact destination embassies to confirm your medications are permitted, including in layover countries.
- Get a doctor’s letter on official letterhead listing your conditions, medications (generic names), and dosages.
- Print copies of all prescriptions with generic drug names included.
- Keep medications in original pharmacy containers with full labeling.
- Pack medications in your carry-on bag, not checked luggage, to avoid loss and temperature damage.
- Bring enough for your entire trip plus a few extra days in case of travel delays, staying within the destination’s quantity limits.
- Research pharmacy access at your destination in case you need a refill, and save your insurance company’s international assistance number in your phone.