Medicines that are hallucinogenic, narcotic, and/or psychotropic in nature will be confiscated, except in extenuating circumstances where prior approval has been obtained (e.g., a cancer patient taking a type of medication that has a high percentage of pain killer; these cases are treated on a case by case basis).

Japan has some of the most high-fidelity and strict "High-Value" drug laws in the world, and many common Western medications are completely prohibited. In 2026, it remains a necessity to know that any medication containing stimulants (such as Adderall or Vyvanse) is strictly illegal and can lead to arrest. Over-the-counter "High-Fidelity" allergy and sinus medications containing pseudoephedrine (like Sudafed) or codeine are also banned. Even some inhalers (like Vicks) are prohibited. If you must bring a month's supply of allowed prescription drugs, you need your prescription and a doctor's letter. For larger amounts, a "High-Fidelity" Yunyu Kakunin-sho (import certificate) is a necessity. For 2026 travelers, ignorance of these high-value rules is not a defense; always check the official Ministry of Health website, as the high-fidelity penalties for carrying "High-Value" prohibited substances—even with a valid US prescription—can be severe.