Check destination regulations before traveling abroad with prescription medication, carry doctor certificates in English, and keep supplies within personal limits

Common prescription and over-the-counter medicines (such as ADHD medication, psychiatric drugs, codeine cough syrup, or cold medicines containing pseudoephedrine) may be strictly regulated or classified as prohibited controlled substances in foreign countries. Bringing them without advance authorization can lead to seizure, deportation, or criminal detention. Always check the destination country's health authority, carry medications in original packaging with doctor's documentation, and limit quantities to 1–3 months of personal supply.

Free. Involves spending 15–30 minutes checking the official health/customs website of your destination country and asking your doctor for an English-language medical summary or prescription.

International regulations on personal pharmaceutical imports vary drastically. For instance, Japan's Ministry of Health, Labour and Welfare (MHLW) and Narcotics Control Department mandate that travelers carrying medications containing controlled substances (such as psychotropics or narcotics) for personal medical use must submit an advance application and obtain an official import certificate at least 14 days prior to travel. Medications containing over 10% ephedrine/pseudoephedrine or over 1% codeine face strict limits. Japanese law limits personal imports of standard prescription drugs to a maximum of 1 month's supply (and other non-prescription drugs to 2 months' supply) without prior special administrative authorization. Singapore's Health Sciences Authority (HSA) restricts travelers to a maximum of 3 months' supply of non-controlled medications, requiring advance HSA approval for controlled substances, warning that exceeding limits results in confiscation and legal enforcement. Chinese exit-entry and customs laws similarly mandate compliance with narcotics and psychotropic regulations.

Regulatory rules evolve and vary by destination. Before departing, check the official health or border agency website of your transit and destination countries, or the consular travel advisories issued by your embassy. Cross-check active pharmaceutical ingredients against the local prohibited list rather than commercial brand names. Always keep medicines in original pharmacy packaging with patient name matching the passport. Never carry prescription medication on behalf of acquaintances or strangers (see Chapter 8, Rule 29). Take high-resolution photos of prescriptions and packaging to store in cloud storage (Chapter 21, Rule 7).

日本厚生劳动省麻药取缔部. Application Guidance（携带含管制成分的药品出入境）：「When you enter/leave Japan carrying your medicine containing controlled substances in Japan for your own medical use, you need to get a permission in advance.」「You should apply at least 14 days prior to your travel.」「you can't send your medicine to/from Japan and you can't also entrust carrying it to other people, such as your family.」. https://www.ncd.mhlw.go.jp/en/application2.html；日本厚生劳动省麻药取缔部 (2024). Controlled Substances List（2024 年 12 月 12 日版）：「Ephedrine, Pseudoephedrine (*Any substances containing 10% or less of ephedrine or pseudoephedrine are excluded.)」「Codeine … (*Any substances containing 1% or less of codeine or its salt are excluded.)」. https://www.ncd.mhlw.go.jp/dl_data/keitai/cotrolled_substances_list20241212%20.pdf；日本厚生劳动省. Information for those who are bringing medicines for personal use into Japan：「Poison, Deadly poison, Prescription drug : Up to 1 month supply」「Other Drugs, Quasi drugs : Up to 2 month supply」. https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/iyakuhin/kojinyunyu/topics/tp010401-1_00001.html；日本厚生劳动省. 医薬品等の個人輸入について：「医療用向精神薬(ジアゼパム、トリアゾラム等)の携帯輸入: 1ヶ月分を超える分量又は注射剤を携帯輸入する場合は、事前に輸入確認証を取得する必要があります」. https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/iyakuhin/kojinyunyu/topics/tp010401-1.html；中国驻日本大使馆 (2018). 来日本旅行请勿携带违禁品. https://jp.china-embassy.gov.cn/jbwzlmnew/lszcnew/LSBHYXZ/LSBHLBZN/201811/t20181113_9475556.htm；Health Sciences Authority, Singapore. Bringing in personal medications：「You may bring up to 3 months' supply if no approval is needed and the medication is not prohibited.」「Please note that imports of quantities exceeding 3 months' supply are not allowed.」「Failure to comply will result in your medication being confiscated or enforcement action may be taken.」. https://www.hsa.gov.sg/travelling-with-medication-and-medical-devices/personal-medications/；全国人大常委会 (2021 年修正). 海关法（第四十六条）. https://flk.npc.gov.cn/detail?id=ff8081817ab22b8a017abd719e0f05c0；国务院 (2024 年第三次修订). 麻醉药品和精神药品管理条例（第四十四条）. https://flk.npc.gov.cn/detail?id=ff8081819c230ff2019c2d0fcaed641d