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DSSTox_CID_3427
Also known as: Phenoxazole, Phenylisohydantoin, Azoksodon, Fenoxazol, Cylert, Tradon
Molecular Formula
C9H8N2O2
Molecular Weight
176.17  g/mol
InChI Key
NRNCYVBFPDDJNE-UHFFFAOYSA-N
FDA UNII
7GAQ2332NK

A central nervous system stimulant used in fatigue and depressive states and to treat hyperkinetic disorders in children.
1 2D Structure

DSSTox_CID_3427

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
2-amino-5-phenyl-1,3-oxazol-4-one
2.1.2 InChI
InChI=1S/C9H8N2O2/c10-9-11-8(12)7(13-9)6-4-2-1-3-5-6/h1-5,7H,(H2,10,11,12)
2.1.3 InChI Key
NRNCYVBFPDDJNE-UHFFFAOYSA-N
2.1.4 Canonical SMILES
C1=CC=C(C=C1)C2C(=O)N=C(O2)N
2.2 Other Identifiers
2.2.1 UNII
7GAQ2332NK
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Compounds, Pemoline

2. Cylert

3. Magnesium, Pemoline

4. Pemadd

5. Pemoline Compounds

6. Pemoline Magnesium

7. Phenoxazole

8. Phenylisohydantoin

9. Tradon

2.3.2 Depositor-Supplied Synonyms

1. Phenoxazole

2. Phenylisohydantoin

3. Azoksodon

4. Fenoxazol

5. Cylert

6. Tradon

7. Dantromin

8. Azoxodon

9. Pemolin

10. 2152-34-3

11. Azoxodone

12. Centramin

13. Deltamine

14. Hyton

15. Nitan

16. Kethamed

17. Sigmadyn

18. Stimulol

19. Okodon

20. Pioxol

21. Pondex

22. Sistra

23. Stimul

24. Tradone

25. Volital

26. Ronyl

27. Phenylpseudohydantoin

28. Pheniminooxazolidinone

29. Betanamin

30. Deltamin

31. Myamin

32. Constimol

33. Phenalone

34. Phenilone

35. Pomoline

36. Endolin

37. Notair

38. Volitol

39. Hyton Asa

40. Juston-wirkstoff

41. Pemolina

42. Sistral

43. Senior

44. 2-imino-5-phenyl-4-oxazolidinone

45. Yh 1

46. 4(5h)-oxazolone, 2-amino-5-phenyl-

47. Npl 1

48. 2-amino-5-phenyl-4(5h)-oxazolone

49. 2-amino-5-phenyl-1,3-oxazol-4(5h)-one

50. 2-amino-5-phenyl-1,3-oxazol-4-one

51. Pemolinum

52. Abbott 13397

53. 5-phenyl-2-imino-4-oxazolidinone

54. 5-phenyl-2-imino-4-oxooxazolidine

55. 4-oxazolidinone, 2-imino-5-phenyl-

56. Nsc-25159

57. Chebi:7953

58. 2-imino-4-keto-5-phenyltetrahydrooxazole

59. 2-amino-5-phenyl-oxazol-4-one

60. Pn/135

61. Fwh-352

62. La 956

63. Pt 360

64. 101053-01-4

65. Nsc-169499

66. Yh-1

67. Pio

68. H 310

69. C- 293

70. A 13397

71. La-956

72. Fio

73. 2-oxazolin-4-one, 2-amino-5-phenyl-

74. Dsstox_cid_3427

75. Dsstox_rid_81815

76. Dsstox_gsid_23427

77. Wln: T5oymv Ehj Bum Er

78. 5-phenyl-2-imino-4-oxazolidine

79. P 10

80. Smr000238142

81. Cas-2152-34-3

82. 2-amino-5-phenyl4(5h)-oxazolone

83. Cylert (tn)

84. Pemoline [hsdb]

85. Pemoline [usan]

86. Pemoline [inn]

87. Pemoline [jan]

88. Pemoline [mi]

89. Pemoline [vandf]

90. Pemoline [mart.]

91. Pemoline [who-dd]

92. Chembl1177

93. Schembl41636

94. Pemoline (jan/usan/inn)

95. Mls000759491

96. Mls001424026

97. Pemoline [orange Book]

98. 2-amino-5-phenyl-4-oxazolone

99. Pemoline, >=98% (hplc)

100. Nrncyvbfpddjne-uhfffaoysa-

101. Hms2051c08

102. Hms3393c08

103. Nsc25159

104. 5-phenyl-2-imino-4-oxo-oxazolidin

105. Tox21_112509

106. 2-amino-5-phenyl-2-oxazolin-4-one

107. Bdbm50248019

108. Nsc169499

109. Akos005065730

110. Akos015888248

111. Tox21_112509_1

112. 2-azanyl-5-phenyl-1,3-oxazol-4-one

113. Ccg-100848

114. Db01230

115. Nc00098

116. Ncgc00246967-01

117. Ncgc00246967-02

118. 5-phenyl-2-iminooxazolidin-4-one

119. Ac-22513

120. As-17043

121. 2-imino-4-oxo-5-phenyloxazolidine

122. Ft-0655727

123. P0392

124. 2-amino-5-phenyl-1,3-oxazol-4(5h)-one #

125. C07899

126. D00744

127. A800319

128. A815446

129. W-107545

2.4 Create Date
2005-03-25
3 Chemical and Physical Properties
Molecular Weight 176.17 g/mol
Molecular Formula C9H8N2O2
XLogP30.9
Hydrogen Bond Donor Count1
Hydrogen Bond Acceptor Count2
Rotatable Bond Count1
Exact Mass176.058577502 g/mol
Monoisotopic Mass176.058577502 g/mol
Topological Polar Surface Area64.7 Ų
Heavy Atom Count13
Formal Charge0
Complexity244
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count1
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Therapeutic Uses

Central Nervous System Stimulants

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


The Agency has concluded that the overall risk of liver toxicity from Cylert and generic pemoline products outweighs the benefits of this drug. In May 2005, Abbott chose to stop sales and marketing of Cylert in the U.S. All generic companies have also agreed to stop sales and marketing of this product (Pemoline tablets and chewable tablets). Cylert is a central nervous system stimulant indicated for the treatment of Attention Deficit Hyperactivity Disorder (ADHD). This product is considered second line therapy for ADHD because of its association with life threatening hepatic failure.

FDA; Center for Drug Evaluation and Research; Alert for Healthcare Professionals, Pemoline Tablets and Chewable Tablets (marketed as Cylert) (October 2005). Available from, as of January 15, 2008: https://www.fda.gov/cder/drug/InfoSheets/HCP/pemolineHCP.htm


Adjunct to psychological, educational, social, and other remedial measures in the treatment of attention deficit disorder with hyperactivity (hyperkinetic syndrome of childhood, minimal brain dysfunction) in carefully selected children older than 6 years of age. /Use is included in the labeling approved by the US Food and Drug Administration/.

McEvoy, G.K. (ed.). American Hospital Formulary Service - Drug Information 92. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1992 (Plus Supplements 1992)., p. 1309


Pemoline has been used in the treatment of fatigue, mental depressions, and chronic schizophrenia, and as a mild stimulant for geriatric patients. /Uses are not included in the labeling approved by the US Food and Drug Administration/.

McEvoy, G.K. (ed.). American Hospital Formulary Service - Drug Information 92. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1992 (Plus Supplements 1992)., p. 1309


4.2 Drug Warning

The Agency has concluded that the overall risk of liver toxicity from Cylert and generic pemoline products outweighs the benefits of this drug. In May 2005, Abbott chose to stop sales and marketing of Cylert in the U.S. All generic companies have also agreed to stop sales and marketing of this product (Pemoline tablets and chewable tablets). Cylert is a central nervous system stimulant indicated for the treatment of Attention Deficit Hyperactivity Disorder (ADHD). This product is considered second line therapy for ADHD because of its association with life threatening hepatic failure.

FDA; Center for Drug Evaluation and Research; Alert for Healthcare Professionals, Pemoline Tablets and Chewable Tablets (marketed as Cylert) (October 2005). Available from, as of January 15, 2008: https://www.fda.gov/cder/drug/InfoSheets/HCP/pemolineHCP.htm


Because of its association with life threatening hepatic failure, Cylert should not ordinarily be considered as first line drug therapy for ADHD. Because Cylert provides an observable symptomatic benefit, patients who fail to show substantial clinical benefit within 3 weeks of completing dose titration, should be withdrawn from Cylert therapy.

FDA; Center for Drug Evaluation and Research; Label Information for Cylert (Pemoline) (Last updated December 2002). Available from, as of January 15, 2008: https://www.fda.gov/cder/foi/label/2003/016832s022_017703s018lbl.pdf


Treatment with Cylert should be initiated only in individuals without liver disease and with normal baseline liver function tests. It is not clear if baseline and periodic liver function testing are predictive of these instances of acute liver failure; however, it is generally believed that early detection of drug induced hepatic injury along with immediate withdrawal of the suspect drug enhances the likelihood for recovery. Accordingly, the following liver monitoring program is recommended: Serum ALT (SGPT) levels should be determined at baseline, and every two weeks thereafter. If Cylert therapy is discontinued and then restarted, liver function test monitoring should be done at baseline and reinitiated at the frequency above. Cylert should be discontinued if serum ALT (SGPT) is increased to a clinically significant level, or any increase > or = 2 times the upper limit of normal, or if clinical signs and symptoms suggest liver failure

FDA; Center for Drug Evaluation and Research; Label Information for Cylert (Pemoline) (Last updated December 2002). Available from, as of January 15, 2008: https://www.fda.gov/cder/foi/label/2003/016832s022_017703s018lbl.pdf


Clinical experience suggests that in psychotic children, administration of Cylert may exacerbate symptoms of behavior disturbance and thought disorder.

FDA; Center for Drug Evaluation and Research; Label Information for Cylert (Pemoline) (Last updated December 2002). Available from, as of January 15, 2008: https://www.fda.gov/cder/foi/label/2003/016832s022_017703s018lbl.pdf


For more Drug Warnings (Complete) data for PEMOLINE (16 total), please visit the HSDB record page.


4.3 Drug Indication

For treatment of Attention Deficit Hyperactivity Disorder (ADHD)


FDA Label


5 Pharmacology and Biochemistry
5.1 Pharmacology

Pemoline belongs to the group of medicines called central nervous system (CNS) stimulants. It is used to treat attention deficit hyperactivity disorder (ADHD). Pemoline stimulates the brain, probably by affecting neurotransmitters, the chemicals in the brain that nerves use to communicate with each other.


5.2 MeSH Pharmacological Classification

Central Nervous System Stimulants

A loosely defined group of drugs that tend to increase behavioral alertness, agitation, or excitation. They work by a variety of mechanisms, but usually not by direct excitation of neurons. The many drugs that have such actions as side effects to their main therapeutic use are not included here. (See all compounds classified as Central Nervous System Stimulants.)


5.3 ATC Code

N - Nervous system

N06 - Psychoanaleptics

N06B - Psychostimulants, agents used for adhd and nootropics

N06BA - Centrally acting sympathomimetics

N06BA05 - Pemoline


5.4 Absorption, Distribution and Excretion

Absorption

Pemoline is rapidly absorbed from the gastrointestinal tract


Route of Elimination

Pemoline is excreted primarily by the kidneys with approximately 50% excreted unchanged and only minor fractions present as metabolites.


Pemoline is rapidly absorbed from the gastrointestinal tract. Approximately 50% is bound to plasma proteins. The serum half-life of pemoline is approximately 12 hours. Peak serum levels of the drug occur within 2 to 4 hours after ingestion of a single dose. Multiple dose studies in adults at several dose levels indicate that steady state is reached in approximately 2 to 3 days. In animals given radiolabeled pemoline, the drug was widely and uniformly distributed throughout the tissues, including the brain.

FDA; Center for Drug Evaluation and Research; Label Information for Cylert (Pemoline) (Last updated December 2002). Available from, as of January 15, 2008: https://www.fda.gov/cder/foi/label/2003/016832s022_017703s018lbl.pdf


... Pemoline and its metabolites are excreted primarily in urine; only negligible amounts are excreted in feces. About 75% of an oral dose is excreted in urine within 24 hr; about 43% is excreted unchanged and about 22% is excreted as pemoline conjugates.

McEvoy, G.K. (ed.). American Hospital Formulary Service - Drug Information 92. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1992 (Plus Supplements 1992)., p. 1309


Pemoline is absorbed from the GI tract, and peak serum concentrations are achieved within 2-4 hours. Multiple-dose studies in adults indicate that serum concentrations plateau in about 3 days. In a study involving adults, the CNS stimulant effect of a single oral dose of pemoline was relatively long, reaching its peak within 4 hr and lasting at least 8 hr. However, when pemoline is administered to children in the treatment of attention deficit disorder, the drug has a gradual onset of action and therapeutic effects may not be apparent until 2 or 3 weeks of therapy.

McEvoy, G.K. (ed.). American Hospital Formulary Service - Drug Information 92. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1992 (Plus Supplements 1992)., p. 1308


5.5 Metabolism/Metabolites

Hepatic


Pemoline is metabolized by the liver. Metabolites of pemoline include pemoline conjugate, pemoline dione, mandelic acid, and unidentified polar compounds. Cylert is excreted primarily by the kidneys with approximately 50% excreted unchanged and only minor fractions present as metabolites.

FDA; Center for Drug Evaluation and Research; Label Information for Cylert (Pemoline) (Last updated December 2002). Available from, as of January 15, 2008: https://www.fda.gov/cder/foi/label/2003/016832s022_017703s018lbl.pdf


5.6 Biological Half-Life

The serum half-life of pemoline is approximately 12 hours.


The serum half-life of pemoline is approximately 12 hours.

FDA; Center for Drug Evaluation and Research; Label Information for Cylert (Pemoline) (Last updated December 2002). Available from, as of January 15, 2008: https://www.fda.gov/cder/foi/label/2003/016832s022_017703s018lbl.pdf


Following a single oral dose in healthy adults, the plasma or serum half-life of pemoline has ranged from about 9-14 hr. Following a single oral dose in children, the plasma elimination half-life exhibits considerable interindividual variation, ranging from about 2-12 hr (mean: 8.6 hr). Preliminary evidence suggests that the drug may exhibit nonlinar kinetics in children following multiple dosing, with the elimination half-life increasing substantially. ...

McEvoy, G.K. (ed.). American Hospital Formulary Service - Drug Information 92. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1992 (Plus Supplements 1992)., p. 1309


5.7 Mechanism of Action

The pharmacologic actions of pemoline are qualitatively similar to those of the amphetamines and methylphenidate, and include CNS and respiratory stimulation and weak sympathomimetic activity. ... Limited animal experiments suggest that the CNS stimulatory action of pemoline may be mediated by brain dopamine. Pemoline may produce an increase in motor activity, mental alertness, diminished sense of fatigue, and mild euphoria. ... In usual therapeutic dosage, pemoline exhibits no substantial effects on the peripheral circulatory system.

McEvoy, G.K. (ed.). American Hospital Formulary Service - Drug Information 92. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1992 (Plus Supplements 1992)., p. 1309


Cylert (pemoline) has a pharmacological activity similar to that of other known central nervous system stimulants; however, it has minimal sympathomimetic effects. Although studies indicate that pemoline may act in animals through dopaminergic mechanisms, the exact mechanism and site of action of the drug in man is not known.

FDA; Center for Drug Evaluation and Research; Label Information for Cylert (Pemoline) (Last updated December 2002). Available from, as of January 15, 2008: https://www.fda.gov/cder/foi/label/2003/016832s022_017703s018lbl.pdf


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