Is Phenibut legal in Thailand?

Legal status

Phenibut is not named in Thailand's criminal drug schedules. A substance specific sweep, run in Thai and by chemical name, found no entry for it in the Thai FDA table of controlled narcotic drugs updated 15 September 2025 and none in the B.E. 2565 psychotropic naming notifications, and no generic analogue clause was identified in the naming model that would reach it without naming it. Phenibut returned no entry, and no analogue clause was found that would reach it through any listed compound. That is a positive finding on a closed list rather than an unresolved search: Thai control is delegated to notifications that name substances one by one, so what the notifications do not name sits outside the Narcotics Code's categories until one names it. It is not a finding that Phenibut is uncontrolled in Thailand. Two instruments were searched, the Thai FDA Table of Controlled Narcotic Drugs updated 15 September 2025 and the Ministry of Public Health psychotropic naming notifications of B.E. 2565, and Thailand also controls medicines through the Drug Act B.E. 2510, which this reading did not open. Which tier of that Act, if any, reaches Phenibut is not established here.

Consequences if caught

Capital exposure: none. No death penalty and no life term arises for Phenibut under the Narcotics Code, and the reason is structural rather than lenient: the Narcotics Code's penalties attach to a scheduled category, the sweep placed this substance in none of them, and with no Category I, II, IV, V or psychotropic entry there is no section 145, 146, 148 or 149 ceiling to state at all. No capital or life exposure under that Code attaches to a closed list negative finding. The sweep that produced this ran across two instruments and no others, the Thai FDA Table of Controlled Narcotic Drugs updated 15 September 2025 and the Ministry of Public Health psychotropic naming notifications of B.E. 2565, so it is an absence from those two and not a finding that Phenibut is uncontrolled in Thailand. What it does not cover is the Drug Act B.E. 2510, the separate medicines statute with its own tiers and its own penalties, which this reading did not open, so which tier of that Act reaches Phenibut, if any, is not established here. No analogue clause was found that would reach phenibut through any listed compound, so neither a named route nor a class route to a section figure exists in what was read.

If prescribed or medical

No entry for Phenibut was found in either of the two instruments that were searched, the Thai FDA Table of Controlled Narcotic Drugs updated 15 September 2025 and the Ministry of Public Health psychotropic naming notifications of B.E. 2565, so no narcotic or psychotropic schedule places it and none can carry a prescription route. That is an absence from those two instruments and it is not a finding that Phenibut is uncontrolled in Thailand. Thailand's country level traveller rule for personal medication was not established by this reading. The sources opened were the Narcotics Code B.E. 2564, the Thai FDA narcotics table updated 15 September 2025 and the B.E. 2565 psychotropic naming notices in the Royal Gazette, and the dossier is explicit that its findings come from those naming instruments and not from a traveller permit label, so no import permit route, no personal supply quantity ceiling and no certificate requirement can be stated here for Phenibut. Thailand controls medicines separately under the Drug Act B.E. 2510, and that Act and its tiers were not opened by this reading, so whether Phenibut is a prescription only medicine, a restricted import or freely carried under it is not established here. What is missing from this row is the permission, not the classification, and the gap is in what was read rather than a finding that no lawful route exists. This is sold as a supplement in some countries and as a medicine in others, and which of those Thailand treats it as was not established here.

Documentation

Carry the distinction this row rests on: the finding for Phenibut is an absence from the Thai FDA Table of Controlled Narcotic Drugs updated 15 September 2025 and from the Ministry of Public Health psychotropic naming notifications of B.E. 2565, which is not a clearance under Thai law generally, so any paperwork it needs would come from the Drug Act B.E. 2510 rather than from the Narcotics Code, and this reading did not open that Act to say which of its tiers, if any, applies. Keep the supplement question and the medicine question apart, because the instruments read here answer neither of them. The reading was taken on 20 September 2026 from the consolidated narcotics table, read alongside the psychotropic naming notices, at https://narcotic.fda.moph.go.th/media.php?id=808160206197497856&name=NARCO+list+(update+15.09.2025)+NEW.pdf. No express open reuse licence was located on the cited page, so only the wording needed for verification is reproduced, with attribution and a direct link. The names and categories are set by ministerial notification, and the publications do not certify that no later notification exists, so re-read before relying on this.

Drug laws and enforcement change and vary within a country. This is not legal advice. Always confirm with Thailand’s embassy or official drug authority before traveling; penalties can be severe, including imprisonment.