Yes, drugs are illegal in Thailand, and the country enforces its narcotics laws against foreign tourists exactly as it does against its own citizens. The Thai Narcotics Code sorts controlled substances into five schedules, with penalties that scale from fines and mandatory rehabilitation up to long prison terms and, for leaders of trafficking networks, the death penalty. Several things travelers often assume are legal or minor — vape pens, Adderall, recreational cannabis — are not, and the gap between a tourist’s expectations and Thai law is where most trouble starts.
The Five Schedules
Thai law groups controlled substances into five schedules based on danger and abuse potential.1Food and Drug Administration, Ministry of Public Health. Knowledge on Narcotics in Thailand in Terms of Import for Personal Use Schedule I is the harshest category and covers heroin, methamphetamine, MDMA, and LSD. Schedule II covers drugs with recognized medical uses but a high risk of abuse: cocaine, morphine, codeine, fentanyl, methadone, and oxycodone. Schedule III is medicinal preparations containing Schedule II substances in reduced-risk formulations. Schedule IV covers precursor chemicals used to make Schedule I or II drugs. Schedule V has historically included cannabis and psychoactive mushrooms, though cannabis has moved in and out of that classification in recent years.
Penalties for Possession
What you’re carrying and how much of it determine the sentence. For Schedule I substances like heroin or methamphetamine, possession below the threshold that triggers a trafficking presumption carries one to ten years in prison, a fine of 20,000 to 200,000 Baht, or both. Cross that threshold and the law treats the drugs as intended for distribution, which raises the penalty sharply.
Unlicensed possession of Schedule II substances carries up to five years in prison and a fine of up to 100,000 Baht. Schedule IV and V substances carry the same five-year, 100,000 Baht ceiling.
When the quantity is consistent with personal use, Thai law now favors rehabilitation over prosecution, and someone caught with a small amount may be routed to a treatment facility instead of charged. That is a possibility, not a right. Personal use is still a crime, and nothing requires police or prosecutors to choose the rehab track.
Penalties for Use
Using a drug is a separate offense from possessing one. Consuming any Schedule I, Schedule II, or Schedule V narcotic carries up to one year in prison, a fine of up to 20,000 Baht, or both.2ASEAN-NARCO. Narcotics Code B.E. 2564 That covers heroin, methamphetamine, cocaine, and morphine on the same footing.
A positive urine test is enough to support a consumption charge even if nothing is found on you. Thai police run these tests in bar districts and tourist areas, and a dirty result puts you in the criminal system immediately.
Trafficking and the Death Penalty
The heaviest punishments are reserved for manufacturing, importing, exporting, or distributing controlled substances. Thailand restructured its drug laws through the Narcotics Code B.E. 2564 in 2021. A “serious drug offence” involving Schedule I drugs now carries a maximum of 15 years in prison and a fine of up to 1.5 million Baht.
The death penalty is still on the books. Under the reformed code, it applies to people identified as leaders or managers of trafficking networks, or whose offenses affected national security or public safety.3Government of Canada. Overview of the Criminal Law System in Thailand Thai courts continue to hand down death sentences for drug crimes.
Cannabis
Cannabis in Thailand has moved through more than one legal status in a short period. It was decriminalized in June 2022, which produced an open retail market. That window has closed. From mid-2025, the government reclassified cannabis flower as a “controlled herb” and limited its sale to medical use. A valid prescription from a licensed doctor, dentist, pharmacist, or traditional medicine practitioner is now required to buy it legally.
The Cannabis and Hemp Act has not been enacted by parliament, so the current rules sit in a patchwork of ministerial regulations and public health orders rather than a single statute.
For a tourist, the practical rules are these: you cannot walk into a shop and buy cannabis recreationally. Medical access requires a consultation with a Thai doctor and a certificate. Smoking cannabis in public is illegal and carries a fine of up to 25,000 Baht. Legal cannabis extracts and products are capped at 0.2 percent THC. Sales to anyone under 20, to pregnant women, and to breastfeeding women are prohibited. Carrying cannabis across the Thai border, in either direction, is illegal in any amount.
Kratom
Kratom is a boundary worth drawing because travelers often lump it in with narcotics. It was removed from the narcotics list in 2021, and the Kratom Plant Act B.E. 2565 now governs it. Leaves are legal to buy and consume, and kratom appears openly in food and drinks. Mixing kratom with narcotics, psychotropic substances, or other dangerous substances is illegal and carries a fine of up to 50,000 Baht. Importing or exporting kratom without a license from the Narcotics Control Board carries up to one year in prison and a fine of up to 100,000 Baht.
Vape Pens Are Banned
This surprises more travelers than any other Thai rule. E-cigarettes, vape pens, pods, e-liquids, and shisha devices have been illegal to import, sell, or possess in Thailand since 2014. There are no exceptions and no personal-use allowance.
If customs officers find a vape in your bag, they will seize it and can issue an on-the-spot fine of 20,000 to 50,000 Baht (roughly $550 to $1,400), calculated as a multiple of the assessed value and payable in cash at the airport. Not paying can escalate to detention. The underlying import prohibition carries a potential prison sentence of up to ten years under the Customs Act, and the separate sales ban carries up to five years and a fine of up to 500,000 Baht.
Multiple embassies have issued advisories stating plainly that not knowing the rule is not a defense. If you arrive in Thailand with a vape, surrender it before clearing customs rather than trying to hide it or replace it on the street later.
Prescription Medications
Several medications routinely prescribed in the United States and Europe are banned outright in Thailand. Amphetamine-based medications such as Adderall and dextroamphetamine sit on Schedule I of the Thai Narcotics Code and cannot be brought in under any circumstances. The same applies to psychotropic substances like GHB, psilocin, and cathinone.4Food and Drug Administration (Thai FDA). Guidance for Travelers under Treatment Carrying Personal Medications Containing Narcotic Drugs or Psychotropic Substances into Thailand
For medications containing Schedule II or III narcotics (codeine, fentanyl, hydrocodone, morphine, oxycodone, and others), what you need depends on the quantity:
- Up to a 90-day supply of narcotic medication: a permit (Form IC-2) from the Thai Food and Drug Administration, applied for at least 15 days before arrival, together with a copy of your passport and a detailed prescription showing your name, diagnosis, medications, dosages, and your doctor’s license number.
- Psychotropic substances in Schedules II through IV, up to 30 days: no permit, but you must carry a prescription or medical certificate with the same details.
- Psychotropic substances in Schedules II through IV, 31 to 90 days: an IC-2 permit, applied for at least 15 days in advance.4Food and Drug Administration (Thai FDA). Guidance for Travelers under Treatment Carrying Personal Medications Containing Narcotic Drugs or Psychotropic Substances into Thailand
Keep all medication in its original labeled prescription bottles and carry the supporting documents through your trip. When the quantity requires a permit, declare the medication at the customs Red Channel on arrival.
Police Powers on the Ground
Thai officers have broad authority to conduct urine tests, and they use it in bars, nightclub districts, street checkpoints, and outside entertainment venues. Testing is not limited to people who look intoxicated, and tourists are not excluded. A positive result gives police grounds to arrest you for consumption even when no drug is found on you.
You can refuse a test, but refusal can be introduced as evidence against you in court and generally sharpens, rather than ends, the encounter.3Government of Canada. Overview of the Criminal Law System in Thailand
Bail is rarely granted for serious drug offenses. When it is, applicants must pledge collateral, and courts can deny bail outright for charges that carry severe minimum sentences. A trial-court denial can be appealed once, to the Appeals Court, and that decision is final. Property connected to drug activity can also be taken through asset forfeiture.3Government of Canada. Overview of the Criminal Law System in Thailand
If a Foreign Tourist Is Arrested
Foreigners face the same charges and procedures as Thai nationals. There is no separate track and no diplomatic workaround. An embassy can help in limited ways but cannot get you out of a Thai jail.
The U.S. Embassy, for example, can visit you in detention, check on your health and treatment, notify your family with your consent, provide a list of local attorneys, and help you communicate with family and counsel. It cannot intervene in the Thai justice system, secure your release, represent you in court, pay your legal fees, hire an attorney for you, or post bail.5U.S. Embassy & Consulate in Thailand. Arrest of a U.S. Citizen Other embassies work under similar limits.
Sentences for drug crimes in Thailand are often longer than someone from the U.S., Europe, or Australia would expect for the same conduct at home, prison conditions are very different, and pretrial detention can run for months. If you are heading to Thailand, treat the laws above as hard lines.