Japan allows most prescription and over-the-counter medications for personal use, but enforces strict quantity limits and outright bans on certain substances that are legal elsewhere. The rules catch many travelers off guard, especially those carrying ADHD medications, strong painkillers, or cannabis-derived products. Getting it wrong can mean confiscation at the airport or, in serious cases, detention and deportation.
Quantity Limits for Personal Use
Japan’s Ministry of Health, Labour and Welfare sets clear caps on how much medication you can bring in without applying for an import certificate. If you stay within these limits, you simply pack your medications and pass through customs normally:
- Prescription drugs: up to a 1-month supply
- Over-the-counter drugs and quasi-drugs (supplements, vitamins, cold medicine): up to a 2-month supply
- External-use products like creams, patches, and ointments (non-prescription): up to 24 units per item
- Injectable drugs and syringes: up to a 1-month supply, and only pre-filled syringes or self-injection kits qualify
- Disposable contact lenses: up to a 2-month supply
Keep medications in their original packaging with the pharmacy label intact. Carrying a copy of your prescription or a letter from your doctor isn’t legally required for amounts under the limit, but it makes things much smoother if a customs officer asks questions.
Medications That Are Completely Banned
Some substances are illegal to bring into Japan under any circumstances, even with a valid prescription from your home country. The Narcotics Control Department lists these as absolute prohibitions:
- Amphetamine and methamphetamine: This is the one that trips up the most travelers. Adderall, widely prescribed for ADHD in the United States, contains amphetamine. Japan’s Stimulants Control Act bans it entirely. There is no workaround, no import certificate, and no exception for medical need.
- Heroin
- Opium powder
- Methaqualone
If you take Adderall or another amphetamine-based ADHD medication, you’ll need to talk with your doctor before traveling. Some travelers switch to a non-amphetamine ADHD medication that Japan does permit (with proper documentation). Vyvanse, which also contains an amphetamine prodrug, falls under the same ban. Methylphenidate-based medications like Ritalin and Concerta are a different class and are allowed, but they require an advance import certificate because they’re classified as psychotropic substances.
Cannabis and CBD Products
Japan bans the import of cannabis and cannabis products, including for medical use. This covers edibles, cannabis-derived medicines, CBD oils, THC gummies, and any product made from the cannabis plant (other than mature stalks or seeds). Japan Customs specifically warns travelers about cookies, butter, cakes, and other edible products containing cannabis that may be legal where you live.
Even CBD products marketed as THC-free can cause problems. If a product is derived from parts of the cannabis plant that fall under Japan’s definition of cannabis, it’s prohibited regardless of its THC content. The safest approach is to leave all cannabis-derived products at home.
Medications That Need an Import Certificate
If you need to bring more than the allowed quantity, or if your medication contains a controlled narcotic or psychotropic substance, you’ll need a document called a Yunyu Kakunin-sho (import certificate) before you travel. Common medications that fall into this category include opioid painkillers like codeine and morphine, benzodiazepines like diazepam, methylphenidate (Ritalin/Concerta), and some sleep medications.
The process works like this: you create an account on the Ministry of Health, Labour and Welfare’s online application system, fill out the form, and attach the required files (typically proof of your prescription and details about the medication). The application is reviewed by the regional bureau of health and welfare closest to your arrival airport in Japan. Once approved, you receive an electronic import certificate that you present at customs.
The Embassy of Japan in the United States recommends applying at least two weeks before your travel date. In practice, giving yourself three to four weeks provides a cushion for any back-and-forth during the review. The certificate is free.
Injectable Medications and Medical Devices
If you use insulin pens, EpiPens, or other self-injection devices, you can bring up to a one-month supply without a certificate, but only if they come as pre-filled syringes or self-injection kits. Loose syringes and vials don’t qualify under the simplified import rules and would require an import certificate.
For medical devices like CPAP machines, the general rule is that personal-use medical equipment for your own treatment is permitted. Keeping documentation from your doctor that explains the medical necessity helps avoid delays at customs. If you rely on a CPAP, carrying a letter that describes the device and your diagnosis is a practical precaution.
What to Do Before You Travel
Start by checking every medication you take against Japan’s banned list. Amphetamines are the most common surprise, but any controlled substance deserves a closer look. For each medication, identify whether it’s an over-the-counter drug (2-month limit), a prescription drug (1-month limit), or a controlled narcotic or psychotropic (requires an import certificate).
If you need the import certificate, apply online through the Ministry of Health, Labour and Welfare’s system at least two weeks out, ideally longer. Pack all medications in original containers with prescription labels visible. Bring a copy of each prescription or a doctor’s letter listing the drug name, dosage, and your diagnosis. You’re not always asked for this at the airport, but when you are, having it ready prevents a stressful interaction with customs officials.
For travelers who take Adderall or other amphetamine-based medications, the planning needs to start earlier. A conversation with your prescribing doctor about temporary alternatives should happen well before your trip, since switching medications takes time to adjust to. Some travelers manage their ADHD trip without medication for short visits, but that’s a personal medical decision worth discussing with your doctor rather than improvising at the last minute.