Japan Drug Import Laws: What Gets Confiscated at Customs and What Does Not

Japan has some of the strictest drug import rules in the world, and ignorance is not a legal defence at Narita or Haneda. Customs officers routinely check bags, and the consequences range from confiscation to arrest. The key distinction is between medications that are banned outright and those that are permitted with advance paperwork.

What Is Banned with No Exceptions

Japan's Stimulants Control Act (覚醒剤取締法) and Narcotics and Psychotropics Control Act create two categories of absolute prohibition for travellers.

Completely banned, no import permit exists:

• All amphetamine-based ADHD drugs: Adderall, Vyvanse, Dexedrine, Mydayis
• Methamphetamine (including some decongestants sold legally in other countries)
• Cocaine, heroin, and most opioids including codeine above 10mg/dose
• Cannabis in any form, including CBD oils derived from cannabis (not hemp)

If you take Adderall at home, you must consult your doctor before departure and explore non-stimulant alternatives such as Strattera (atomoxetine) or Intuniv (guanfacine), both of which are legally importable under standard rules. Do not attempt to carry a supply of Adderall, even in a labelled prescription bottle. The prescription is irrelevant under Japanese law.

What Requires a Yunyu Kakunin-sho

A Yunyu Kakunin-sho (輸入確認書) — formerly called Yakkan Shoumei (薬監証明) — is an import certificate issued by Japan's Ministry of Health, Labour and Welfare. Without it, customs can seize otherwise legal medications if you exceed permitted quantities or if the drug falls into a controlled category.

Medications that require a Yunyu Kakunin-sho:

• Benzodiazepines: Xanax (alprazolam), Valium (diazepam), Klonopin (clonazepam)
• Sleeping aids: Ambien (zolpidem), Lunesta (eszopiclone)
• Pseudoephedrine-based decongestants (e.g. Sudafed) if you carry more than 24 tablets
• Certain antipsychotics and high-dose opioid pain medications

To obtain a Yunyu Kakunin-sho, apply via the MHLW online portal (mhlw.go.jp) at least two to four weeks before travel. You submit your prescription, a doctor's letter in English, your passport details, and a cover letter explaining medical necessity. The certificate is emailed as a PDF. Print two copies: one to present at customs, one to keep.

What You Can Bring Without Any Paperwork

Common over-the-counter and prescription medications are permitted for personal use up to a one-month supply for most drugs, or two months for vitamins, supplements, and non-controlled OTC products.

No permit needed:

• Paracetamol (Tylenol) and ibuprofen (Advil, Nurofen)
• Antihistamines: Zyrtec (cetirizine), Claritin (loratadine), Benadryl
• Antidepressants in the SSRI/SNRI class: Prozac, Zoloft, Lexapro, Effexor
• Most antibiotics with a prescription
• Birth control pills (up to a 2-month supply)
• Insulin and diabetic supplies (no quantity limit; bring a doctor's letter for ease)

Keep all medications in their original labelled packaging. Carry a copy of your prescription or a doctor's letter for any prescription drug, even where not strictly required. This speeds up any secondary inspection.

At the Airport: Practical Steps

Declare medications on your customs form if in doubt. Proactively placing prescription drugs in an accessible outer pocket of your bag saves time at inspection. If you carry a Yunyu Kakunin-sho, hand it to the customs officer before they ask. Officers at major international terminals are experienced with the document and the process is usually quick.

If a medication is seized and you believe it was wrongly confiscated, request a written seizure notice and contact your country's embassy in Tokyo immediately. Do not attempt to argue the case at the customs desk.

Plan ahead. The Yunyu Kakunin-sho system exists precisely so legitimate patients can travel. Use it.