Psychotropic Substances Act (Thailand) Last updated July 18, 2025 Thailand 's Psychotropic Substances Act is a law designed to regulate certain mind-altering drugs. Along with the Drug Act and the Narcotic Act, the Psychotropic Substances act is one of the major acts that the Thai FDA works under. [ 1] The Act divides psychotropic drugs into four Schedules. Offenses involving Schedule I and II drugs carry heavier penalties than those involving Schedule III and IV drugs. Note that this statute does not regulate most opioids , cocaine , or some amphetamines . The vast majority of narcotic painkillers, along with cocaine and most amphetamines are regulated under the Narcotics Act .
Schedule I Schedule I drugs have no known medical use and a high potential for abuse. [ 2] Some examples include:
Schedule II Schedule II drugs are prescribed for contemporary medical treatments, but still have a potential for abuse. [ 2] Some examples include:
Amfepramone (2-(Diethylamino) propiophenone) Aminorex (2-amino-5-phenyl-2-oxazoline) Butorphanol (17-(cyclobutymethyl) morphinan 3, 14-diol) Cathine (d-threo-2-Amino-1-hydroxy- 1- phenylpropane) Fencamfamin ((+)-N-Ethyl-3-phenylbicyclo-(2,2,1)-heptan-2-amine) Fenethylline ((+)-3,7-Dihydro-1,3-dimethyl-7-(2-[(1-methyl-2-phenyl-ethyl) amino]-ethyl)-1H-purine-2,6-dione) Flunitrazepam (5-(o-Fluorophenyl)-1,3-dihydro-1-methyl-7-nitro-2H-1, 4-benzodiazepin-2-one) Ketamine (Cyclohexanone, 2-(2-chlorophenyl)-2-(methylamino)) Mazindol (5-(p-Chlorophenyl)-2,5-dihydro-3H-imidazo [2,1-a]-isoindol-5-o1) Methaqualone (2-methyl-3-o-tolyl-4(3H)-quinazolinone) Methylphenidate (2-Phenyl-2-(2-piperidyl) acetic acid, methyl ester) Nimetazepam (1,3-Dihydro-1-methyl-7-nitro-5-phenyl-2H-1,4-benzo-diazepin-2-one) Pemoline (2-Amino-5-phenyl-4(5H)-oxazolone) Pentobarbital (5-Ethyl-5-(1-methylbutyl) barbituric acid) Phencyclidine (1-(1-Phenyl-cyclohexyl)-piperidine) Secobarbital (5-Allyl-5-(1-methylbutyl) barbituric acid) Temazepam (7-Chloro-1,3-dihydro-3-hydroxy-1-methyl-5-phenyl-2H-1, 4-benzodiazepin-2-one) Triazolam (8-Chloro-6-(o-Chlorophenyl)-1-methyl-4H-s-triazolo [4,3-a] [1,4] benzodiazepine) Schedule III Schedule III drugs are used in contemporary medicine, and have a potential or tendency for abuse. [ 2] Some examples include:
Amobarbital (5-Ethyl-5-(3-methylbutyl) barbituric acid) Brotizolam (2-Bromo-4-(2-chlorophenyl)-9-methyl-6H-thieno [3,2-f] [1,2,4,] triazolo-[4,3-a] [1,4] diazepine) Buprenorphine (21-Cyclopropyl-7-α-[(s)-1-hydroxy-1,2,2-trimethylpropyl]-6, 14-endo-ethano-6,7,8, 14-tetrahydrooripavine) Butalbital (5-Allyl-5-isobutylbarbituric acid) Cyclobarbital (5-(1-Cyclohexen-1-yl)-5-ethylbarbituric acid) Flutoprazepam (7-chloro-1-cyclopropylmethyl-1,3-dihydro-5-(2-fluorophenyl)-2H-1,4-benzodiazepin-2-one) Glutethimide (2-Ethyl-2-phenyl-glutarimide) Loprazolam (6-(o-Chlorophenyl)-2,4 dihydro-2-[(4-methyl-1-piperazinyl) methylene]-8-nitro-1H-imidazo [1,2-a] [1,4] benzodiazepin-1-one) Lormetazepam (7-Chloro-5-(o-chlorophenyl)-1,3-dihydro-3-hydroxy-1-methyl- 2H-1,4-benzodiazepin-2-one) Midazolam (8-Chloro-6-(2-fluorophenyl)-1-methyl-4H-imidazo-(1,5-a) (1,4) benzodiazepine) Meprobamate (2-Methyl-2-propyl-1,3-propanediol dicarbamate) Nitrazepam (1,3-Dihydro-7-nitro-5-phenyl-2H-1,4-benzodiazepin-2-one) Pentazocine (1, 2, 3, 4, 5, 6-Hexahydro-6, 11-dimethyl-3-(3-methyl-2-butenyl)-2, 6- methano-3-benzazocin-8-ol) Schedule IV Schedule III drugs are used in contemporary medicine, and have a lower potential or tendency for abuse than those in schedule III. [ 2] Some examples include:
Allobarbital (5,5-diallybarbituric acid) Alprazolam (8-chloro-1-methyl-6-phenyl-4H-s-triazolo [4,3-a] [1,4] benzodiazepine) Barbital (5, 5-diethylbarbituric acid) Benzphetamine (N-benzyl-N, α -dimethylphenethylamine) Bromazepam (7-bromo-1,3-dihydro-5-(2-pyridyl)-2H-1,4- benzodiazepin-2-one) Butobarbital (5-butyl-5-ethylbarbituric acid) Camazepam (7-Chloro-1,3-dihydro-3-hydroxy-1-methyl-5-phenyl-2H-1, 4 benzodiazepin-2-one dimethylcarbamate) Chloral hydrate and its adducts Chlordiazepoxide (7-chloro-2-(methylamino)-5-phenyl-3H-1, 4-benzodiazepine- 4- oxide) Clobazam (7-Chloro-1-methyl-5-phenyl-1H-1,5-benzodiazepine-2,4-(3H, 5H)-dione) Clonazepam (5-(o-Chlorophenyl)-1, 3-dihydro-7-nitro-2H-1, 4-benzodiazepin-2-one) Clortermine (2-chloro- α, α -demethyl benzeneethanamine) Diazepam (7-Chloro-1,3-dihydro-1-methyl-5-phenyl-2H-1,4-benzodiazepin-2-one) Ethchlorvynol (ethyl-2-chlorovinyl-ethinyicabinol) Lorazepam (7-Chloro-5(o-chlorophenyl)-1,3-dihydro-3-hydroxy-2H-1, 4-benzodiazepin-2-one) Mefenorex ((±)-N(3-chloropropyl)-a-methylphenethylamine) Oxazepam (7-Chloro-1,3-dihydro-3-hydroxy-5-phenyl-2H-1,4-benzodiazepin-2-one) Phenobarbital (5-ethyl-5-phenylbarbituric acid) Propylhexedrine ((±)-N,a-Dimethylcyclohexane-ethylamine) Tetrazepam (7-Chloro-5-(cyclohexen-1-yl)-1,3-dihydro-1-methyl-2H-1, 4-benzodiazepin-2-one) Vinylbital (5-(1-methylbutyl)-5-vinylbarbituric acid) References ↑ Al-Worafi, Yaser; et al. (Chanthawat Patikorn, Wimon Suwankesawong, Noppadon Adjimatera, Thanisa Thathong, Poonyawee Luksameesate, Nattanichcha Kulthanachairojana, Kittinop Kittirotruji, Doungporn Leelavanich, Puree Anantachoti) (2020-06-05), "Chapter 22 - Drug safety in Thailand" , Drug Safety in Developing Countries: Achievements and Challenges , Academic Press, pp. 255– 278, doi :10.1016/B978-0-12-819837-7.00022-4 , ISBN 978-0-12-819837-7 1 2 3 4 Juslaws & Consult, Offenses Related to Drugs , retrieved 2025-07-12 Controlled Psychotropic Substances - FDA
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