It’s important to make sure that your medications are allowed in Thailand, and that you are traveling with the necessary documents. Some medications that are readily obtainable in other countries such as Sudafed (active ingredient pseudoephedrine), codeine and cannabis are controlled substances in Thailand. That could mean that travelers need a permit from the Thai government, that they must travel with evidence that the medication is for personal use or that the medication may be prohibited altogether. This article is intended to clarify the process for bringing medications to Thailand.
I relied heavily on information from the Thai Food and Drug Administration (FDA). Program participants and staff are encouraged to double check the official FDA sources, as this information can change without notice. As of October 2025, they post a guide for travelers.
We will cover:
- The different classifications of controlled substances (psychotropics and narcotics)
- What must be included in a prescription
- When a traveler must apply for an import permit
- The procedure for obtaining an import permit
Controlled Substances
The Thai authorities define controlled substances under psychotropics and narcotics.
Psychotropics
There are four schedules of psychotropics.
Schedules II through IV
- Psychotropics in schedules II through IV may be brought in no more than a 30 day supply in the original containers with a medical prescription certificate from the prescribing doctor.
- If bringing between 31 and 90 days of Schedule I through III psychotropics, travelers must get an import permit from the FDA.
Schedule I Psychotropics
Psychotropics on schedule I are completely prohibited in Thailand. Travelers should not bring them under any circumstances.
Narcotics
Narcotics are classified on schedules I through III.
Schedule II through IV Narcotics
- Travelers must always seek an import permit to bring Schedule II through IV narcotics to Thailand for personal use.
Schedule I Narcotics
Schedule I narcotics are prohibited in Thailand, and travelers should not bring them under any circumstances.
Certificate Of Medical Prescription
All travelers planning to come to Thailand with controlled substances should Carry a certificate of medical prescription. If a traveler is applying for an import permit, they will have to submit the prescription as part of the documentation. Even if a permit is not needed, a traveler could be asked for evidence that the medication is prescribed as part of a medical treatment plan. According to the resource on submitting an online application for an import permit, the prescription has to have been written within the last three months.
A prescription should include the following:
- The name of the individual taking the medication
- A list of the medication’s including names, the medical condition that each medication treats, quantities and dosages
- The date that the prescription was issued
- The name and signature of the prescribing physician
Traveling with a Supply of 1-30 days of a Schedule II through IV Psychotropic Medication
Travelers coming to Thailand with a supply of 30 days or less of a psychotropic medication on schedules II through IV do not need to apply for a permit ahead of time.
Upon arrival to the country, they have to declare the medication, passing through the red channel of customs, where they must present the medication in their original containers along with the prescription.
Traveling with a Schedule II through III Narcotic or a 31-90 day Supply of a Schedule II through IV Psychotropic
Travelers will need to apply for an import permit. An online form can be submitted in which the traveler fills out information about:
- Name and passport number
- Itinerary
- Names of medication’s
- The quantity and dose of each medication that is taken daily
Once the form is filled out, the traveler will upload a copy of their passport and the prescription certificate. though a response may be expected within three days, it is recommended to apply at least two weeks in advance of travel.
An import permit will be sent by email. It is a good idea to travel with a printed copy, which Will need to be presented in the red channel of customs. Travelers may also show their permit on a smart phone.
Official Government instructions can be found here.
Regardless
- It is not permitted to travel to Thailand with more than a 90 day supply of a controlled substance
- Upon exiting the country, a traveler may be requested to show their remaining medication’s at the red channel of customs
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