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Alti-Triazolam
Also known as: Halcion, 28911-01-5, Songar, Triazolamum [inn-latin], U-33,030, 8-chloro-6-(2-chlorophenyl)-1-methyl-4h-[1,2,4]triazolo[4,3-a][1,4]benzodiazepine
Molecular Formula
C17H12Cl2N4
Molecular Weight
343.2  g/mol
InChI Key
JOFWLTCLBGQGBO-UHFFFAOYSA-N
FDA UNII
1HM943223R

A short-acting benzodiazepine used in the treatment of insomnia. Some countries temporarily withdrew triazolam from the market because of concerns about adverse reactions, mostly psychological, associated with higher dose ranges. Its use at lower doses with appropriate care and labeling has been reaffirmed by the FDA and most other countries.
Triazolam is a Benzodiazepine.
1 2D Structure

Alti-Triazolam

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
8-chloro-6-(2-chlorophenyl)-1-methyl-4H-[1,2,4]triazolo[4,3-a][1,4]benzodiazepine
2.1.2 InChI
InChI=1S/C17H12Cl2N4/c1-10-21-22-16-9-20-17(12-4-2-3-5-14(12)19)13-8-11(18)6-7-15(13)23(10)16/h2-8H,9H2,1H3
2.1.3 InChI Key
JOFWLTCLBGQGBO-UHFFFAOYSA-N
2.1.4 Canonical SMILES
CC1=NN=C2N1C3=C(C=C(C=C3)Cl)C(=NC2)C4=CC=CC=C4Cl
2.2 Other Identifiers
2.2.1 UNII
1HM943223R
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Apo Triazo

2. Apo-triazo

3. Gen Triazolam

4. Gen-triazolam

5. Halcion

6. Trilam

7. U 33,030

8. U-33,030

9. U33,030

2.3.2 Depositor-Supplied Synonyms

1. Halcion

2. 28911-01-5

3. Songar

4. Triazolamum [inn-latin]

5. U-33,030

6. 8-chloro-6-(2-chlorophenyl)-1-methyl-4h-[1,2,4]triazolo[4,3-a][1,4]benzodiazepine

7. Dea No. 2887

8. Triazolam Civ

9. U 33030

10. U-33030

11. N05cd05

12. 8-chloro-6-(o-chlorophenyl)-1-methyl-4h-s-triazolo(4,3-a)(1,4)benzodiazepine

13. Clorazolam

14. Novidorm

15. Chembl646

16. 4h-(1,2,4)triazolo(4,3-a)(1,4)benzodiazepine, 8-chloro-6-(2-chlorophenyl)-1-methyl-

17. Chebi:9674

18. 8-chloro-6-(2-chlorophenyl)-1-methyl-4h-(1,2,4)triazolo(4,3-a)(1,4)benzodiazepine

19. 1hm943223r

20. Ncgc00168258-01

21. Triazolamum

22. Novodorm

23. Trilam

24. 8-chloro-6-(o-chlorophenyl)-1-methyl-4h-s-triazolo[4,3-a][1,4]benzodiazepine

25. 4h-[1,2,4]triazolo[4,3-a][1,4]benzodiazepine, 8-chloro-6-(2-chlorophenyl)-1-methyl-

26. 4h-s-triazolo(4,3-a)(1,4)benzodiazepine, 8-chloro-6-(o-chlorophenyl)-1-methyl-

27. Hypnostat

28. Halcion (tn)

29. Halcion (triazolam)

30. Ccris 1932

31. Hsdb 6759

32. Einecs 249-307-3

33. Tgar01h

34. Brn 1226643

35. Triazolam (jan/usp/inn)

36. Hypam

37. Unii-1hm943223r

38. Triazolam [usan:usp:inn:ban:jan]

39. Triazolam [inn]

40. Triazolam [jan]

41. Triazolam [mi]

42. Triazolam [hsdb]

43. Triazolam [usan]

44. Triazolam [vandf]

45. Triazolam [mart.]

46. Triazolam [who-dd]

47. Dsstox_cid_26763

48. Dsstox_rid_81886

49. Dsstox_gsid_46763

50. Schembl29228

51. Mls003899243

52. Gtpl7313

53. Zinc2212

54. Triazolam [orange Book]

55. Triazolam Civ [usp-rs]

56. Dtxsid6046763

57. Triazolam [usp Monograph]

58. Triazolam 0.1 Mg/ml In Methanol

59. Triazolam 1.0 Mg/ml In Methanol

60. Hy-b0694

61. Tox21_112617

62. 28911-01-5 (free)

63. Bdbm50001765

64. Db00897

65. Smr000058837

66. Cas-28911-01-5

67. D00387

68. U33030

69. 911t015

70. L000796

71. Q412143

72. Sr-01000937604

73. Sr-01000937604-2

74. Triazolam, European Pharmacopoeia (ep) Reference Standard

75. 8-chloro-1-methyl-6-(o-chlorophenyl)-4h-s-triazolo-[4,3-a][1,4] Benzodiazepine

76. 8-chloro-1-methyl-6-(o-chlorophenyl)-4h-s-triazolo[4,3-a][1,4]benzodiazepine

77. 8-chloro-6-(2-chlorophenyl)-1-methyl-4h-benzo[f][1,2,4]triazolo[4,3-a][1,4]diazepine

78. 8-chloro-6-(2-chlorophenyl)-1-methyl-4h-s-triazolo[4,3-a][1,4]-benzodiazepine

79. Triazolam Solution, 1.0 Mg/ml In Methanol, Ampule Of 1 Ml, Certified Reference Material

80. (e)-8-chloro-6-(2-chlorophenyl)-1-methyl-4h-benzo[f][1,2,4]triazolo[4,3-a][1,4]diazepine

81. 12-chloro-9-(2-chlorophenyl)-3-methyl-2,4,5,8-tetraazatricyclo[8.4.0.0^{2,6}]tetradeca-1(10),3,5,8,11,13-hexaene

2.4 Create Date
2005-03-25
3 Chemical and Physical Properties
Molecular Weight 343.2 g/mol
Molecular Formula C17H12Cl2N4
XLogP32.4
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count3
Rotatable Bond Count1
Exact Mass342.0439018 g/mol
Monoisotopic Mass342.0439018 g/mol
Topological Polar Surface Area43.1 Ų
Heavy Atom Count23
Formal Charge0
Complexity472
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Drug Information
1 of 4  
Drug NameHalcion
PubMed HealthTriazolam (By mouth)
Drug ClassesHypnotic
Drug LabelHALCION Tablets contain triazolam, a triazolobenzodiazepine hypnotic agent.Triazolam is a white crystalline powder, soluble in alcohol and poorly soluble in water. It has a molecular weight of 343.21.The chemical name for triazolam is 8-chloro-6-(o-c...
Active IngredientTriazolam
Dosage FormTablet
RouteOral
Strength0.25mg; 0.125mg
Market StatusPrescription
CompanyPharmacia And Upjohn

2 of 4  
Drug NameTriazolam
PubMed HealthTriazolam (By mouth)
Drug ClassesHypnotic
Drug LabelTriazolam tablets contain triazolam, a triazolobenzodiazepine hypnotic agent.Triazolam is a white crystalline powder, soluble in alcohol and poorly soluble in water. It has a molecular weight of 343.21.The chemical name for triazolam is 8-chloro-6-(o...
Active IngredientTriazolam
Dosage FormTablet
RouteOral
Strength0.25mg; 0.125mg
Market StatusPrescription
CompanyMylan Pharms; Roxane

3 of 4  
Drug NameHalcion
PubMed HealthTriazolam (By mouth)
Drug ClassesHypnotic
Drug LabelHALCION Tablets contain triazolam, a triazolobenzodiazepine hypnotic agent.Triazolam is a white crystalline powder, soluble in alcohol and poorly soluble in water. It has a molecular weight of 343.21.The chemical name for triazolam is 8-chloro-6-(o-c...
Active IngredientTriazolam
Dosage FormTablet
RouteOral
Strength0.25mg; 0.125mg
Market StatusPrescription
CompanyPharmacia And Upjohn

4 of 4  
Drug NameTriazolam
PubMed HealthTriazolam (By mouth)
Drug ClassesHypnotic
Drug LabelTriazolam tablets contain triazolam, a triazolobenzodiazepine hypnotic agent.Triazolam is a white crystalline powder, soluble in alcohol and poorly soluble in water. It has a molecular weight of 343.21.The chemical name for triazolam is 8-chloro-6-(o...
Active IngredientTriazolam
Dosage FormTablet
RouteOral
Strength0.25mg; 0.125mg
Market StatusPrescription
CompanyMylan Pharms; Roxane

4.2 Therapeutic Uses

Adjuvants, Anesthesia; GABA Modulators; Sedatives, Nonbarbiturate

National Library of Medicine's Medical Subject Headings online file (MeSH, 1999)


... Triazolam /is/ indicated for the short-term treatment of insomnia characterized by difficulty in falling asleep, frequent nocturnal awakenings, and/or early morning awakenings. ... Failure of insomnia to remit after 7 to 10 days of treatment may indicate the presence of a primary psychiatric or medical illness. Worsening of insomnia or the emergence of new abnormalities of thinking or behavior may be the consequence of an unrecognized psychiatric or physical disorder. /Included in US product labeling/

Thomson.Micromedex. Drug Information for the Health Care Professional. 24th ed. Volume 1. Plus Updates. Content Reviewed by the United States Pharmacopeial Convention, Inc. Greenwood Village, CO. 2004., p. 519


Benzodiazepine agents are widely prescribed in the treatment of anxiety and nervousness. /Benzodiazepine agents/

Amdur, M.O., J. Doull, C.D. Klaasen (eds). Casarett and Doull's Toxicology. 4th ed. New York, NY: Pergamon Press, 1991., p. 932


4.3 Drug Warning

Pregnancy risk category: X /CONTRAINDICATED IN PREGNANCY. Studies in animals or humans, or investigational or post-marketing reports, have demonstrated positive evidence of fetal abnormalities or risk which clearly outweights any possible benefit to the patient./

Thomson.Micromedex. Drug Information for the Health Care Professional. 24th ed. Volume 1. Plus Updates. Content Reviewed by the United States Pharmacopeial Convention, Inc. Greenwood Village, CO. 2004., p. 251


In patients who have received prolonged triazolam therapy, abrupt discontinuance of the drug should be avoided since manifestations of withdrawal can be precipitated. While the risk and severity of withdrawal manifestations are increased as the duration and dose increase, such manifestations are increased as the duration and dose increase, such manifestations can occur at usual doses given for relatively short periods (e.g., 1-2 weeks) and occasionally between nightly doses. Therefore, if the drug is to be discontinued in any patient receiving more than the lowest dose for longer than a few weeks, it si recommended that dosage be tapered gradually. Gradual tapering is particularly important in patients with a seizure history. There also is evidence that abrupt discontinuance of triazolam after relatively short periods of therapy (e.g., 1 week) can result in rebound insomnia, which generally persists for one to two nights. Therefore, some clinicians suggest that gradual dosage reduction (e.g., over several nights) also be considered when discontinuing short-term triazolam therapy, since the development of rebound insomnia can perpetuate continued use of hypnotics in patients with insomnia.

McEvoy, G.K. (ed.). American Hospital Formulary Service- Drug Information 2004. Bethesda, MD: American Society of Health-System Pharmacists, Inc. 2004 (Plus Supplements)., p. 2402


Urticaria, rash, pruritus, photosensitivity, immediate hypersensitivity reactions, hypotension, nonthrombocytopenic purpura, and edema may occur in patients receiving benzodiazepines. Paresthesia and lupus-like syndrome have been reported. /Benzodiazepines/

McEvoy, G.K. (ed.). American Hospital Formulary Service- Drug Information 2004. Bethesda, MD: American Society of Health-System Pharmacists, Inc. 2004 (Plus Supplements)., p. 2376


Increased or decreased libido, menstrual irregularities, failure to ovulate, gynecomastia, and galactorrhea have been reported in patients receiving benzodiazepines. Genitourinary complaints such as urinary retention, difficulty in micturition, and urinary incontinence have occurred. ... /Benzodiazepines/

McEvoy, G.K. (ed.). American Hospital Formulary Service- Drug Information 2004. Bethesda, MD: American Society of Health-System Pharmacists, Inc. 2004 (Plus Supplements)., p. 2376


For more Drug Warnings (Complete) data for TRIAZOLAM (15 total), please visit the HSDB record page.


4.4 Drug Indication

For the short-term treatment of insomnia.


5 Pharmacology and Biochemistry
5.1 Pharmacology

A short-acting benzodiazepine used as a hypnotic agent in the treatment of insomnia. Some countries temporarily withdrew triazolam from the market because of concerns about adverse reactions, mostly psychological, associated with higher dose ranges. Its use at lower doses with appropriate care and labeling has been reaffirmed by the FDA and most other countries. Triazolam has a shorter half-life than chlordiazepoxide, flurazepam, and prazepam and does not generate active metabolites.


5.2 MeSH Pharmacological Classification

Anti-Anxiety Agents

Agents that alleviate ANXIETY, tension, and ANXIETY DISORDERS, promote sedation, and have a calming effect without affecting clarity of consciousness or neurologic conditions. ADRENERGIC BETA-ANTAGONISTS are commonly used in the symptomatic treatment of anxiety but are not included here. (See all compounds classified as Anti-Anxiety Agents.)


GABA Modulators

Substances that do not act as agonists or antagonists but do affect the GAMMA-AMINOBUTYRIC ACID receptor-ionophore complex. GABA-A receptors (RECEPTORS, GABA-A) appear to have at least three allosteric sites at which modulators act: a site at which BENZODIAZEPINES act by increasing the opening frequency of GAMMA-AMINOBUTYRIC ACID-activated chloride channels; a site at which BARBITURATES act to prolong the duration of channel opening; and a site at which some steroids may act. GENERAL ANESTHETICS probably act at least partly by potentiating GABAergic responses, but they are not included here. (See all compounds classified as GABA Modulators.)


Adjuvants, Anesthesia

Agents that are administered in association with anesthetics to increase effectiveness, improve delivery, or decrease required dosage. (See all compounds classified as Adjuvants, Anesthesia.)


5.3 FDA Pharmacological Classification
5.3.1 Active Moiety
TRIAZOLAM
5.3.2 FDA UNII
1HM943223R
5.3.3 Pharmacological Classes
Benzodiazepines [CS]; Benzodiazepine [EPC]
5.4 ATC Code

N05CD05

S76 | LUXPHARMA | Pharmaceuticals Marketed in Luxembourg | Pharmaceuticals marketed in Luxembourg, as published by d'Gesondheetskeess (CNS, la caisse nationale de sante, www.cns.lu), mapped by name to structures using CompTox by R. Singh et al. (in prep.). List downloaded from https://cns.public.lu/en/legislations/textes-coordonnes/liste-med-comm.html. Dataset DOI:10.5281/zenodo.4587355


N - Nervous system

N05 - Psycholeptics

N05C - Hypnotics and sedatives

N05CD - Benzodiazepine derivatives

N05CD05 - Triazolam


5.5 Absorption, Distribution and Excretion

Absorption

Bioavailability is 44% (oral) and 53% (sublingual).


Route of Elimination

Triazolam and its metabolites, principally as conjugated glucuronides, which are presumably inactive, are excreted primarily in the urine. Only small amounts of unmetabolized triazolam appear in the urine. The two primary metabolites accounted for 79.9% of urinary excretion.


Plasma half-life, elimination coefficient, concentration, and apparent volume of distribution were calculated at steady state and mean values were 53 hr, 0.0147/hr, 884 ng/mL, & 1.13 l/kg /respectively/.

POST C ET AL; PSYCHOPHARMACOLOGY (BERLIN) 53 (2): 105-9 (1977)


Triazolam is rapidly and nearly completely absorbed from the GI tract. It has a biphasic half-life with a reported mean apparent half-life of 3.4 hr for the initial phase and 7.8 hr for the terminal phase. It is reported to be extensively bound to plasma proteins. It is excreted in the urine in the form of its metabolites with only small amounts appearing unchanged.

Reynolds, J.E.F., Prasad, A.B. (eds.) Martindale-The Extra Pharmacopoeia. 28th ed. London: The Pharmaceutical Press, 1982., p. 818


In a study of triazolam tablets and a liquid formulation in healthy subjects, the bioavailability of the tablets was rapid and, relative to the liquid formulation, complete. The average half-life for absorption was 8 minutes with peak concentrations being achieved an average of 42 minutes after dosing.

Reynolds, J.E.F., Prasad, A.B. (eds.) Martindale-The Extra Pharmacopoeia. 28th ed. London: The Pharmaceutical Press, 1982., p. 818


It is not known whether triazolam is distributed into milk in humans; however, the drug and its metabolites are distributed into milk in rats.

McEvoy, G.K. (ed.). American Hospital Formulary Service- Drug Information 2004. Bethesda, MD: American Society of Health-System Pharmacists, Inc. 2004 (Plus Supplements)., p. 2402


5.6 Metabolism/Metabolites

Hepatic. Small amounts of unmetabolized triazolam appear in the urine.


Triazolam undergoes hepatic microsomal oxidation to inactive hydroxylated metabolites that are eliminated primarily as glucuronide conjugates.

Thomson.Micromedex. Drug Information for the Health Care Professional. 24th ed. Volume 1. Plus Updates. Content Reviewed by the United States Pharmacopeial Convention, Inc. Greenwood Village, CO. 2004., p. 520


Triazolam has known human metabolites that include 4-Hydroxytriazolam and alpha-Hydroxytriazolam.

S73 | METXBIODB | Metabolite Reaction Database from BioTransformer | DOI:10.5281/zenodo.4056560


5.7 Biological Half-Life

1.5-5.5 hours


It has a biphasic half-life with a reported mean apparent half-life of 3.4 hr for the initial phase and 7.8 hr for the terminal phase.

Reynolds, J.E.F., Prasad, A.B. (eds.) Martindale-The Extra Pharmacopoeia. 28th ed. London: The Pharmaceutical Press, 1982., p. 818


Elimination half-life for triazolam is 1.6-5.4 hr. /From table/

Reynolds, J.E.F., Prasad, A.B. (eds.) Martindale-The Extra Pharmacopoeia. 28th ed. London: The Pharmaceutical Press, 1982., p. 818


5.8 Mechanism of Action

Benzodiazepines bind nonspecifically to bezodiazepine receptors BNZ1, which mediates sleep, and BNZ2, which affects affects muscle relaxation, anticonvulsant activity, motor coordination, and memory. As benzodiazepine receptors are thought to be coupled to gamma-aminobutyric acid-A (GABAA) receptors, this enhances the effects of GABA by increasing GABA affinity for the GABA receptor. Binding of GABA to the site opens the chloride channel, resulting in a hyperpolarized cell membrane that prevents further excitation of the cell.


In animals, benzodiazepines protect against seizures induced by electrical stimulation and by pentylenetetrazol; benzodiazepines appear to act, at least partly, by augmenting presynaptic inhibition. The drugs suppress the spread of seizure activity but do not abolish the abnormal discharge from a focus in experimental models of epilepsy. In usual doses, benzodiazepines appear to have very little effect on the autonomic nervous system, respiration, or the cardiovascular system. /Benzodiazepines/

McEvoy, G.K. (ed.). American Hospital Formulary Service- Drug Information 2004. Bethesda, MD: American Society of Health-System Pharmacists, Inc. 2004 (Plus Supplements)., p. 2379


... /Benzodiazepines/ appear to act at the limbic, thalamic, and hypothalamic levels of the CNS, producing anxiolytic, sedative, hypnotic, skeletal muscle relaxant, and anticonvulsant effects. The effects of benzodiazepines may be mediated through the inhibitory neurotransmitter gamma-aminobutyric acid. Benzodiazepines are capable of producing all levels of CNS depression from mild sedation to hypnosis to coma. /Benzodiazepines/

McEvoy, G.K. (ed.). American Hospital Formulary Service- Drug Information 2004. Bethesda, MD: American Society of Health-System Pharmacists, Inc. 2004 (Plus Supplements)., p. 2379


Anxiolytic and possibly paradoxical CNS stimulatory effects of benzodiazepines are postulated to result from release of previously suppressed responses (disinhibition). After usual doses of benzodiazepines for several days, the drugs cause a moderate decrease in rapid eye movement (REM) sleep. REM rebound does not occur when the drugs are withdrawn. Stage 3 and 4 sleep are markedly reduced by usual doses of the drugs; the clinical importance of these sleep stage alterations has not been established. /Benzodiazepines/

McEvoy, G.K. (ed.). American Hospital Formulary Service- Drug Information 2004. Bethesda, MD: American Society of Health-System Pharmacists, Inc. 2004 (Plus Supplements)., p. 2379


Benzodiazepines appear to produce skeletal muscle relaxation predominantly by inhibiting spinal polysynaptic afferent pathways, but the drugs may also inhibit monosynaptic afferent pathways. The drugs may inhibit monosynaptic and polysynaptic reflexes by acting as inhibitory neuronal transmitters or by blocking exitatory synaptic transmission. The drugs may also directly depress motor nerve and muscle function. /Benzodiazepines/

McEvoy, G.K. (ed.). American Hospital Formulary Service- Drug Information 2004. Bethesda, MD: American Society of Health-System Pharmacists, Inc. 2004 (Plus Supplements)., p. 2379


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