Japan Drug Laws: Cannabis and Personal Prescription Medicines
Contents
- 1. 1. Cannabis and THC: do not rely on an old “possession only” summary
- 2. 2. Identify the active ingredient, not just the brand
- 3. 3. Controlled medicines: get the correct advance permission
- 4. 4. Ordinary personal-use medicines: quantity guidance is not a blanket exemption
- 5. 5. Application timing, office notices and online applications
- 6. 6. Questions to resolve before packing
Before travelling to Japan, check the active ingredient in every medicine or product you plan to carry and confirm its Japanese regulatory category. A prescription issued in your home country does not, by itself, mean that the medicine may be imported into Japan. In particular, the rules for prohibited substances, advance permission for certain controlled medicines, and quantity limits for ordinary personal-use medicines are separate: meeting one requirement does not cancel another.
This guide explains how to approach those checks using official Japanese guidance. It cannot determine whether a particular medicine is permitted without details such as its ingredient, formulation, quantity and treatment purpose. The information below was checked on 4 November 2026; consult the relevant authorities for your own medicine and travel dates before packing.
1. Cannabis and THC: do not rely on an old “possession only” summary
Do not rely on outdated claims that Japan controls cannabis possession but not use. The National Police Agency says amendments took effect on 12 December 2024, making unlawful use subject to punishment alongside offences such as possession and transfer. It identifies THC, a harmful component of cannabis, as a narcotic under Japanese regulation. Read the National Police Agency’s current cannabis information rather than relying on a summary written before the amendment.
The rules matter to travellers because a product may contain cannabis-related substances even when it does not look like dried plant material. The police guidance describes cannabis in liquid and wax-like forms as well as dried material. It also warns about foods containing THC, giving cookies and sweets as examples. A familiar package, a food-like appearance, or a product’s legal retail status in another country does not establish that it can be brought into Japan.
The National Police Agency’s guidance describes penalties of up to seven years’ imprisonment for relevant offences such as simple possession and use. This article does not determine how a particular product or action would be classified, and it is not a substitute for legal advice. If you are unsure what a product contains or how it is treated in Japan, do not try to resolve the question from its foreign label or a creator’s claim; seek an answer from the responsible Japanese authority before travelling.
2. Identify the active ingredient, not just the brand
The first step for a prescription medicine is to identify its active ingredient and check that ingredient against the Japanese regulatory lists. A brand name alone may not be enough: product names can vary between countries, and the same or similar brand name may not tell an authority which ingredient or formulation you have. The Narcotics Control Department’s English application guidance directs travellers to check by ingredient name and to consult the prescribing doctor if the category is unclear.
The department gives morphine, fentanyl and oxycodone as examples of narcotics, and lisdexamfetamine as an example of a stimulant raw material. These are examples of regulatory categories, not a complete list and not a ruling on a medicine that is not named here. Do not assume that a medicine is ordinary, prohibited or eligible for a particular procedure simply because it is used for treatment or has a prescription.
Collect enough information to describe the exact medicine and your travel plan. Use this checklist when you speak with your prescriber or contact the authority:
| Information to collect | Why it matters |
|---|---|
| Active ingredient | The regulatory lists are checked by ingredient, not just by brand name. |
| Product name, form and strength | The authority needs to identify the product you will actually carry. |
| Daily amount and total quantity | The intended treatment supply and quantity are relevant to the procedure. |
| Treatment purpose | The personal-carrying procedure concerns medicine for the traveller’s own treatment. |
| Entry and departure dates | Import and export are separate applications, so the relevant travel dates matter. |
Keep the medicine information together with the doctor’s explanation. The Kanto-Shinetsu Regional Bureau’s guidance on carrying regulated medicines recommends that an English medical certificate include the ingredient as well as the product name. Including both helps the receiving office identify the medicine without having to infer an ingredient from a brand name used in a particular market.
Psychotropic medicines also require a medicine-specific check. The official guidance involves ingredient-specific quantity tables and a separate check of the injectable-medicine category; this article does not reproduce those limits or decide whether a particular product qualifies. If your medicine may fall into that category, check the applicable official information with the ingredient, form and amount in hand rather than applying the general quantity table below.
3. Controlled medicines: get the correct advance permission
The official guidance requires advance permission to carry therapeutic narcotics and medicinal stimulant raw materials for personal treatment. Permission is issued without a fee, but the paperwork depends on the substance category and whether you are entering or leaving Japan. Start with the Narcotics Control Department’s carrying procedure, identify the category, and use the corresponding application rather than choosing a form based only on a medicine’s brand.
| Stage | What the official procedure calls for |
|---|---|
| Establish the category | Identify the active ingredient and its Japanese regulatory category. |
| Choose the application | Use the import application for entry or the export application for departure; narcotics and stimulant raw materials have different forms. |
| Prepare medical documents | Provide a doctor’s certificate in Japanese or English with the required patient and medicine details. |
| Identify the product | Submit medicine information that confirms the product’s name. |
| Apply in advance | The general deadline is two weeks before the relevant entry or departure date. |
| Travel with the documents | Show the issued Japanese permission and English certificate, with the medicine, to customs. |
The medical certificate must include the patient’s name and address, why the medicine is needed, the product name, its strength and the daily amount. The authority also asks for medicine information that identifies the product. The general application deadline is two weeks before entry or departure, so treat it as a requirement to plan ahead—not as a promise that a late application will be completed before a flight.
For a trip that both enters and later leaves Japan, distinguish the import procedure from the export procedure. The official guidance specifies a携帯輸入許可申請書 for entry and a携帯輸出許可申請書 for departure, with different forms for narcotics and stimulant raw materials. Use the official application page to establish which form applies to your ingredient and travel direction; do not assume that permission for one leg automatically covers the other.
Once permission is issued, keep the Japanese permission document and the English certificate with the medicine and present them to customs as instructed. Permission under this personal-carrying procedure does not allow the medicine to be sent separately. The regional guidance also says that a friend travelling separately cannot carry it on your behalf; it describes an accompanying helper or carer carrying it in the stated circumstances. If you need an accompanying person to help, explain the actual arrangement to the authority rather than assuming that any third-party arrangement qualifies.
Japanese permission is not permission to carry the same medicine into another country. Check the rules for every other destination and any relevant transit arrangement separately, and do not treat a Japanese certificate as a universal travel authorisation. The same principle applies to the return journey: confirm the Japanese export requirements as well as the rules that apply where you are going.
4. Ordinary personal-use medicines: quantity guidance is not a blanket exemption
Some medicines for personal use may be imported without an import confirmation when they are within the general quantities described by the health ministry. The guidance gives different thresholds for different product categories; it is not one universal limit for every medicine. Check the full Ministry of Health, Labour and Welfare guidance on bringing personal-use medicines into Japan before relying on a quantity threshold.
| General category in the guidance | Quantity described as not requiring an import confirmation |
|---|---|
| Prescription medicines, poisons and powerful medicines | Up to one month’s supply |
| Other ordinary internal medicines and quasi-drugs outside the specified categories | Up to two months’ supply |
| Relevant external-use products outside the specified categories | Up to 24 units per item |
| Certain prefilled syringes or self-injection kits | Up to one month’s supply |
These are general quantity indications for the import-confirmation procedure, not permission to bring in an otherwise prohibited ingredient. A controlled medicine may still require advance permission even if you carry an amount within an ordinary quantity threshold. Conversely, an ordinary medicine that exceeds its applicable amount may require an import-confirmation procedure even if it is not in the controlled categories discussed above.
If an import confirmation is required, obtain it before departure and present it to customs as instructed. Keep this paperwork distinct from a narcotics or stimulant-raw-material permission: the documents have different purposes and application routes. Do not assume that one document satisfies the other procedure simply because both concern medicines in your luggage.
The regional guidance lists substances that cannot be carried under the personal-carrying procedure, including heroin, stimulants, opium powder, opium granules and opium tincture. It also describes methadone as not eligible except when used for pain treatment. These examples are not enough to decide an unlisted medicine or a particular case. Give the authority the ingredient, formulation, quantity and treatment purpose so it can assess the relevant rule.
5. Application timing, office notices and online applications
Plan the paperwork around your actual entry and departure dates. The general advance deadline for the controlled-medicine permission described above is two weeks before the relevant date, and an incomplete certificate or unclear ingredient information can delay your ability to establish which procedure applies. Ask your prescriber for the ingredient and treatment details while you still have time to clarify them, then check the correct official application route.
As stated in the English application guidance, a limited online-application trial was announced for November 2026. The notice does not mean that every traveller is eligible, so check whether the trial applies to you instead of assuming that it replaces the normal procedure. It also says not to submit a duplicate online application if you have already completed the usual email procedure.
The same official page lists an office closure from 29 December 2026 through 3 January 2027. If your travel falls near that period, check the official guidance and contact the responsible office about the procedure that applies to your dates; do not infer a special submission deadline that is not stated on the page. Keep the response or confirmation for the route you actually use, and travel with the documents required for the medicine.
Videos and online discussions can help explain why travellers ask about Japan’s drug laws, but they do not establish whether your own medicine can be imported. Stuff They Don’t Want You To Know has discussed the subject under a “loophole” title, and LegalinJapan has also presented a discussion of drug laws in Japan. Treat those as general context, not as authority decisions: a video title, a foreign retail label or a comment about another person’s medicine cannot replace the ingredient-specific official check.
6. Questions to resolve before packing
Before packing, make sure you can answer four practical questions: What is the active ingredient? Which Japanese category does it fall into? What procedure applies to the amount and form you will carry? Do you have the required documents for both the Japanese leg of your journey and any other country involved? If any answer is unclear, use the official guidance linked above and ask the prescriber or responsible authority before travel.
Does a prescription from my home country mean I can bring the medicine into Japan?
No. The official guidance warns that some medicines prescribed abroad cannot be imported into or exported from Japan. Check the active ingredient and the required procedure rather than treating the prescription as travel permission.
If my medicine is within the ordinary quantity limit, do I still need controlled-medicine permission?
Possibly. The ordinary quantity guidance and the controlled-ingredient rules are separate, so a medicine may need advance permission even when the amount is small. Confirm the category before using a quantity threshold.
Can I ask a friend travelling separately to carry my medicine?
The regional guidance says not to entrust the medicine to a friend travelling separately under the personal-carrying procedure. It describes an accompanying helper or carer carrying it in the stated circumstances, but that is not a general permission for third parties. Explain the actual arrangement to the authority.
Can I submit an online application after completing the normal email procedure?
The November 2026 notice says not to submit a duplicate online application if the normal email procedure has already been completed. The online trial is limited, so check the official notice to see whether it applies to your case. Keep the confirmation for the procedure you actually used.
Does Japanese permission also cover my destination or transit country?
No. Japanese permission does not guarantee permission to carry the medicine into another country. Check each country’s requirements separately, including the rules relevant to your route.
Can this guide confirm whether a particular medicine is allowed?
No. That decision depends on details such as the ingredient, formulation, quantity and treatment purpose, and some medicine categories require additional specific checks. Use the official sources with those details rather than relying on a general article or another traveller’s experience.
The information in this guide was checked on 4 November 2026 against the National Police Agency, the Narcotics Control Department, the Ministry of Health, Labour and Welfare and the Kanto-Shinetsu Regional Bureau. Rules and application notices can change, so revisit the relevant official pages before travel. The key action is to identify the ingredient early and obtain the specific permission or confirmation that applies to your medicine, rather than assuming that an ordinary prescription or small quantity is enough.
