ThailandTravelling with ADHD medication: rules, permits and documents

Connecting through Thailand

The Thai FDA's detailed traveller guidance document ('Guidance for Travelers under Treatment Carrying Personal Medications Containing Narcotic Drugs/Psychotropic Substances into Thailand') is structured entirely around 'Entry into Thailand' and 'Exit from Thailand' declaration points at the Customs Department (Red Channel). It does not mention transit, transhipment, or connecting passengers who do not clear Thai immigration. Thailand's 2024 INCB traveller-regulations submission is also silent on transit passengers, covering only documentation and day-limits for those entering or exiting. No official source (including the Thai Customs Department's transit provisions and Thailand's legal database) confirms whether the Narcotics Act / Psychotropic Substances Act's ban on 'importation' has any transit carve-out. Category 1 narcotics (amphetamine/dextroamphetamine) are described by the FDA as having 'no medical use in Thailand' and are barred with no personal-use exception for entry. Because no official source distinguishes airside transit, travellers connecting through Bangkok carrying Adderall or dextroamphetamine should not assume airside transit is safe without explicit confirmation, though this cannot be confirmed either way. Status is unclear for all three medications regarding airside-only transit.

If you clear immigration: No official source carves out a transit exemption. Landside transit (clearing Thai immigration for a connection or overnight) should be treated as full entry. Per the Thai FDA's own guidance: methylphenidate (a Category 2 psychotropic substance) can be carried for up to 30 days' supply with only a prescription or medical certificate, no advance permit needed. Lisdexamfetamine, now a Category 2 narcotic drug (reclassified Feb 2025), requires an advance Thai FDA permit (Form IC-2, applied for at least 15 days before arrival, though an older FDA guidance PDF said 2 weeks) for up to 90 days' supply, and must be presented at the red/declare channel. Amphetamine/dextroamphetamine (Category 1 narcotic) is prohibited outright with no personal-use exception, even for entry.

Staying airside, never clearing immigration:

no official guidance found, so assume the full entry rules apply. Thailand publishes nothing about transit. Bangkok is a major connecting airport, so this silence matters: a traveller carrying lisdexamfetamine through Bangkok has no official assurance either way.

Clearing immigration for a layover:

the full entry rules apply. Clearing immigration means entering Thailand, so you need the permit before a landside layover.

Changing airports:

the full entry rules apply. Moving between Suvarnabhumi and Don Mueang forces a full clearance, so the entry rules apply.

Overnight layover, leaving the airport:

the full entry rules apply. Leaving the airport means clearing immigration and customs.

Checked bag travelling without you:

no official guidance found, so assume the full entry rules apply. Not addressed. The traveller concessions are written only for medicines carried in person; the guidance prohibits non-exempt narcotics and psychotropics by any route including post, and says nothing about a traveller's own medicine moving without them.