Japan’s Stimulants Control Act (Act No. 252 of 1951) makes it a serious crime to possess, use, transfer, import, or export methamphetamine, amphetamine, or their concentrated precursors without a government license, and the penalties range from years of imprisonment with required labor up to life in prison for profit-motivated smuggling.1Japanese Law Translation. Stimulants Control Act The law applies the same way to residents, tourists, and anyone transiting through the country, and it treats common ADHD medications containing amphetamine as prohibited substances regardless of a foreign prescription.
What the Act Controls
The statute names two base chemicals as “Stimulants”: phenylaminopropane (amphetamine) and phenylmethylaminopropane (methamphetamine). Their salts, such as methamphetamine hydrochloride, are included automatically, and any preparation containing these chemicals falls under the Act no matter how diluted.1Japanese Law Translation. Stimulants Control Act There is no minimum quantity. A tablet, a powder, or a liquid containing any detectable amount is treated the same as a pure batch. Charges are built on laboratory confirmation of the molecule, so novel formulations and street-level mixtures cannot escape the law by using a different name.
A second tier covers “Stimulants Raw Materials,” the precursor chemicals used to make amphetamine and methamphetamine. These are listed in an Appended Table and include ephedrine, pseudoephedrine, and phenylacetic acid, along with their salts.1Japanese Law Translation. Stimulants Control Act Because many of these appear in cold medicines and decongestants, the Act applies a concentration cutoff: substances at 10 percent or less of a listed raw material are excluded, while anything above 10 percent triggers the same licensing requirements, import restrictions, and criminal penalties that apply to the finished stimulants.
The Act bans virtually every form of unauthorized contact. No one may possess, use, transfer, receive, import, or export these substances without a specific government license. Giving a stimulant away is treated the same as selling it, and receiving one as a gift carries the same criminal weight as buying from a dealer.1Japanese Law Translation. Stimulants Control Act Attempted offenses are punishable across all categories.
Penalties
Sentencing escalates sharply when profit motive is involved.
Possession, Use, and Transfer
Possessing, receiving, or transferring stimulants without authorization carries a maximum sentence of 10 years’ imprisonment with required labor. Simple use carries the same 10-year maximum.1Japanese Law Translation. Stimulants Control Act There is no fine-only option. Imprisonment is the default, and Japanese judges rarely suspend sentences for stimulant crimes.
Importation
Bringing stimulants into Japan without authorization carries a minimum sentence of one year’s imprisonment, with no statutory maximum for a fixed term. When the import was for profit, the penalty jumps to either life imprisonment or a minimum of three years, and the court can add a fine of up to 10,000,000 yen.1Japanese Law Translation. Stimulants Control Act Smuggling cases at airports regularly produce sentences of seven or more years, even for first-time offenders.
Possession or Distribution for Profit
Possessing or distributing stimulants for profit carries a minimum of one year’s imprisonment and can include a fine of up to 5,000,000 yen. The profit motive also applies to unauthorized use and to manufacturing of raw materials.1Japanese Law Translation. Stimulants Control Act
Traveling to Japan With Prescription Medication
This is where travelers from the United States, Canada, and Europe most often run into trouble. Medications that are legal with a prescription at home can lead to arrest at a Japanese airport.
Adderall and Other Amphetamine Medications
Adderall and any medication containing amphetamine or dextroamphetamine cannot be brought into Japan under any circumstances. The Narcotics Control Department of the Ministry of Health, Labour and Welfare states that amphetamine is classified as a “Stimulant” under the Act and “cannot be imported into Japan, even for treatment purposes.”2Narcotics Control Department, Ministry of Health, Labour and Welfare. Application Guidance A foreign prescription, a doctor’s letter, and advance paperwork do not change this. Travelers who rely on amphetamine-based ADHD medication must switch to a permitted alternative before the trip or go without.
Vyvanse and Other Lisdexamfetamine Medications
Lisdexamfetamine, sold as Vyvanse, Elvanse, Venvanse, and similar brand names, falls into the “Stimulants Raw Materials” category rather than the “Stimulants” category. It can be brought into Japan, but only with advance government permission. You must apply for an Import Certificate from the Narcotics Control Department at least 14 days before your trip.2Narcotics Control Department, Ministry of Health, Labour and Welfare. Application Guidance
The application requires the specific form for Stimulants Raw Materials from the Narcotics Control Department, a medical certificate issued by your prescribing doctor within three months of application (listing your name, address, specific medical reason, dosage, and the doctor’s signature; vague language like “for personal use” is rejected), and photos or documentation of the medication package showing name and strength. Submit the application to the Narcotics Control Department office covering your arrival airport. You must carry the medication on your person when entering the country and present the Import Certificate to customs. Mailing the medication separately or having someone else carry it is not permitted.2Narcotics Control Department, Ministry of Health, Labour and Welfare. Application Guidance
A Note on Methylphenidate
Methamphetamine, like amphetamine, is completely banned for import. Methylphenidate (Ritalin, Concerta) is regulated separately as a psychotropic substance under the Narcotics and Psychotropics Control Law, with its own documentation requirements rather than the stimulant rules described here.2Narcotics Control Department, Ministry of Health, Labour and Welfare. Application Guidance If your medication is methylphenidate, confirm the psychotropic import procedure directly with the Narcotics Control Department before traveling.
What Happens If You Are Arrested
Japanese criminal procedure for drug suspects works very differently from what most Western visitors expect. After arrest, police can hold a suspect for up to 72 hours before requesting a court-ordered detention. If a judge finds probable cause, the court issues an initial 10-day detention order, and prosecutors can request a second 10-day extension. The maximum pre-indictment detention is 23 days.3U.S. Embassy & Consulates in Japan. Under Investigation: The Next 20 Days At the end of that window, the prosecutor must either file a formal indictment or release the suspect.
Suspects have the constitutional right to remain silent, and investigators must inform them of that right before questioning. Court-appointed counsel is available for suspects who cannot afford a private attorney, and defense attorneys can visit their clients and communicate confidentially. Under current Japanese law, however, attorneys are not permitted inside the interrogation room during questioning. Interrogations happen repeatedly during the detention period.
Japanese courts have held that a defendant does not need to know the precise chemical identity of what they were carrying. Prosecutors generally need to show that the person knew they possessed a controlled or suspicious substance, even if they did not know it was specifically methamphetamine. Once a case reaches trial, the conviction rate approaches 99.9 percent, which means the pre-trial detention phase is often where the outcome is effectively decided.
Immigration Consequences for Foreign Nationals
A conviction under the Act carries immigration consequences that outlast any prison sentence. Under Japan’s Immigration Control and Refugee Recognition Act, anyone convicted of violating a law relating to stimulants, narcotics, marijuana, or psychotropic substances is denied permission to land in Japan, with no time limit on that prohibition.4Japanese Law Translation. Immigration Control and Refugee Recognition Act In practice this functions as a permanent re-entry ban.
Foreigners deported for Stimulants Control Act violations face a separate re-entry ban of five years for a first deportation, or 10 years for anyone previously deported.4Japanese Law Translation. Immigration Control and Refugee Recognition Act The permanent drug-conviction bar overrides these shorter periods, so a stimulant conviction results in a lifetime landing bar regardless of how minor the underlying offense. The bar also applies to convictions from other countries. A stimulant conviction from anywhere in the world can be grounds for refusing entry to Japan.