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2D Structure
Also known as: Allypropymal, Alurate, Allylpropymal, Aprobarbitone, Allonal, Allional
Molecular Formula
C10H14N2O3
Molecular Weight
210.23  g/mol
InChI Key
UORJNBVJVRLXMQ-UHFFFAOYSA-N
FDA UNII
Q0YKG9L6RF

Aprobarbital is a barbiturate derivative synthesized in the 1920s by Ernst Preiswerk. It was determined that the substance was capable of demonstrating sedative, hypnotic, and anticonvulsant effects. A primary treatment indicated for the use of aprobarbital was subsequently insomnia. Aprobarbital was never as widely used as more common barbiturate derivatives such as phenobarbital and is now rarely prescribed.
1 2D Structure

2D Structure

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
5-propan-2-yl-5-prop-2-enyl-1,3-diazinane-2,4,6-trione
2.1.2 InChI
InChI=1S/C10H14N2O3/c1-4-5-10(6(2)3)7(13)11-9(15)12-8(10)14/h4,6H,1,5H2,2-3H3,(H2,11,12,13,14,15)
2.1.3 InChI Key
UORJNBVJVRLXMQ-UHFFFAOYSA-N
2.1.4 Canonical SMILES
CC(C)C1(C(=O)NC(=O)NC1=O)CC=C
2.2 Other Identifiers
2.2.1 UNII
Q0YKG9L6RF
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Allylpropymal

2. Allylpropymal, Monosodium Salt

3. Aprobarbitone

2.3.2 Depositor-Supplied Synonyms

1. Allypropymal

2. Alurate

3. Allylpropymal

4. Aprobarbitone

5. Allonal

6. Allional

7. Aprobarbita

8. Aprozal

9. Numal

10. 77-02-1

11. Allylisopropylmalonylurea

12. 5-allyl-5-isopropylbarbituric Acid

13. Alurate Elixir Verdum

14. Allylisopropylbarbituric Acid

15. Isopropylallylbarbituric Acid

16. 5-isopropyl-5-allylbarbituric Acid

17. 5-allyl-5-isopropylbarbiturate

18. Barbituric Acid, 5-allyl-5-isopropyl-

19. Nsc 120769

20. Aprobarbital (inn)

21. 5-(1-methylethyl)-5-(2-propenyl)-2,4,6(1h,3h,5h)-pyrimidinetrione

22. Nsc120769

23. Q0ykg9l6rf

24. Nsc-120769

25. 2,4,6(1h,3h,5h)-pyrimidinetrione, 5-(1-methylethyl)-5-(2-propenyl)-

26. 5-allyl-5-isopropylpyrimidine-2,4,6(1h,3h,5h)-trione

27. Chebi:2791

28. Allypropymalum

29. Isonal (swedish)

30. Aprobarbitale

31. Aprobarbitalum

32. Aprobarbitale [dcit]

33. Aprobarbital [inn]

34. Aprobarbitalum [inn-latin]

35. 2,4,6(1h,3h,5h)-pyrimidinetrione, 5-(1-methylethyl)-5-(2-propenyl)- (9ci)

36. Alurate (tn)

37. Ccris 7088

38. Hsdb 3290

39. Einecs 200-997-4

40. Unii-q0ykg9l6rf

41. Brn 0180858

42. Aprobarbital [inn:dcf:nf]

43. 5-propan-2-yl-5-prop-2-enyl-1,3-diazinane-2,4,6-trione

44. Aprobarbital [mi]

45. Aprobarbital [hsdb]

46. Aprobarbital [vandf]

47. Chembl7863

48. Schembl78101

49. Aprobarbital [mart.]

50. Aprobarbital [who-dd]

51. Dtxsid8022616

52. Schembl15364625

53. Schembl22556213

54. 5-(prop-2-en-1-yl)-5-(propan-2-yl)-1,3-diazinane-2,4,6-trione

55. Hy-u00166

56. 5-(1-methylethyl)-5-prop-2-en-1-ylpyrimidine-2,4,6(1h,3h,5h)-trione

57. 5-(propan-2-yl)-5-(prop-2-en-1-yl)pyrimidine-2,4,6(1h,3h,5h)-trione

58. Akos003404772

59. Aprobarbital (1.0 Mg/ml In Methanol)

60. Cs-7223

61. Db01352

62. Wln: T6vmvmv Fhj Fy1&1 F2u1

63. Ns00005163

64. C07826

65. D00698

66. Q411940

67. 5-allyl-5-isopropyl-2,4,6(1h,3h,5h)-pyrimidinetrione

68. 2,6(1h,3h,5h)-pyrimidinetrione, 5-(1-methylethyl)-5-(2-propenyl)-

2.4 Create Date
2004-09-16
3 Chemical and Physical Properties
Molecular Weight 210.23 g/mol
Molecular Formula C10H14N2O3
XLogP31.1
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count3
Rotatable Bond Count3
Exact Mass g/mol
Monoisotopic Mass g/mol
Topological Polar Surface Area75.3
Heavy Atom Count15
Formal Charge0
Complexity314
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 Therapeutic Uses

BARBITURATES MAY BE USED FOR PREANESTHETIC MEDICATION & TO PRODUCE BASAL ANESTHESIA. ... BARBITURATES ARE EMPLOYED AS DIAGNOSTIC & THERAPEUTIC AIDS IN PSYCHIATRY, IN NARCOANALYSIS & NARCOTHERAPY. /BARBITURATES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 119


ONE OF THE INTERMEDIATE-ACTING BARBITURATES ...

Osol, A. and J.E. Hoover, et al. (eds.). Remington's Pharmaceutical Sciences. 15th ed. Easton, Pennsylvania: Mack Publishing Co., 1975., p. 1003


Aprobartital has been used for the short-term treatment /2 weeks or less/ of insomnia; however, it generally has been replaced by benzodiazepines. ... Has also been used for routine sedation to relieve anxiety, tension, and apprehension; however, barbiturates generally have been replaced by benzodiazepines for daytime sedation. /Uses are included in the labeling approved by the US Food and Drug Administration/.

United States Pharmacopeial Convention; USP Dispensing Information 12th ed Vol IA p.574 (1992)


The primary Medication Classification of the Veterans Administrations is CN301: Barbituric Acid Derivatives, Sedatives/Hyponotics.

United States Pharmacopeial Covention; USP Dispensing Information 12th ed Vol IA p.573 (1992)


4.2 Drug Warning

May be habit forming.

Budavari, S. (ed.). The Merck Index - Encyclopedia of Chemicals, Drugs and Biologicals. Rahway, NJ: Merck and Co., Inc., 1989., p. 119


AS WITH ETHANOL ... SEDATIVE DOSES THAT EXERT NO EFFECTS OBVIOUS TO UNTRAINED OBSERVER OR PATIENTS CAN CAUSE IMPAIRMENT IN LEARNING, JUDGEMENT, SHORT-TERM MEMORY, DRIVING PERFORMANCE ... /BARBITURATES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 106


... IMPORTANT IN USE ... DURING LABOR IS ... POSSIBLE RESP DEPRESSANT EFFECT ON INFANT, SINCE PLACENTA OFFERS NO SIGNIFICANT BARRIER ... /BARBITURATES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 110


CAPACITY OF BARBITURATES TO INCR SYNTHESIS OF PORPHYRINS IS RESPONSIBLE FOR ONE ... BIZARRE & DANGEROUS SIDE EFFECT. IN PT SUFFERING FROM ACUTE INTERMITTENT PORPHYRIA, DRUGS MAY PPT SEVERE ATTACK, POSSIBLY ... PARALYSIS & DEATH. /BARBITURATES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 111


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


5 Pharmacology and Biochemistry
5.1 ATC Code

N - Nervous system

N05 - Psycholeptics

N05C - Hypnotics and sedatives

N05CA - Barbiturates, plain

N05CA05 - Aprobarbital


5.2 Absorption, Distribution and Excretion

RATE OF DECLINE OF BLOOD CONCN AFTER A LARGE DOSE FOR ... ALURATE ... IS 25-40% /PER 24 HR/ ... RATE OF DECLINE IS A FUNCTION OF ACCUMULATION IN LIVER, METAB OF DRUG & URINARY EXCRETION.

Thienes, C., and T.J. Haley. Clinical Toxicology. 5th ed. Philadelphia: Lea and Febiger, 1972., p. 63


AS MUCH AS 50% OF HYPNOTIC DOSE OF ... APROBARBITAL MAY BE EXCRETED UNCHANGED BY KIDNEY. ... APROBARBITAL ... ELIMINATED SLOWLY, OVER A PERIOD OF SEVERAL DAYS.

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 114


A FRACTION OF BARBITURATE IN BLOOD IS REVERSIBLY BOUND TO PLASMA PROTEIN, CHIEFLY ALBUMIN. ... THE CEREBROSPINAL FLUID IS VIRTUALLY PROTEIN FREE. ACCORDINGLY, THE MAXIMAL CONCN OF BARBITURATES ATTAINED IN CEREBROSPINAL FLUID IS LESS THAN THE PLASMA CONCN, BEING IN MOST CASES SLIGHTLY LESS THAN THE CONCN IN AN ULTRAFILTRATE OF PLASMA. THE CONCN IN OCULAR FLUID IS SIMILAR TO THAT OF CEREBROSPINAL FLUID. IN TISSUES, THE BARBITURATE CONCN IS GENERALLY AS HIGH AS OR SLIGHTLY HIGHER THAN IN PLASMA. /BARBITURATES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 113


... SODIUM SALTS ARE MORE RAPIDLY ABSORBED THAN FREE ACIDS ... FOOD IN STOMACH DECR RATE OF ABSORPTION BUT NOT AMT ABSORBED. THERE EXISTS NO IMPENETRABLE BARRIER TO ... BARBITURATES IN BODY ... IF SOJOURN OF DRUG IN PLASMA IS SUFFICIENTLY LONG, IT WILL BE DISTRIBUTED TO ALL TISSUES & FLUIDS. /BARBITURATES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 112


For more Absorption, Distribution and Excretion (Complete) data for APROBARBITAL (10 total), please visit the HSDB record page.


5.3 Metabolism/Metabolites

PARTLY METABOLIZED IN LIVER BY OXIDN OF C-5 SUBSTITUENT(S) (ALLYL &/OR ISOPROPYL GROUPS) ... ALLYL GROUP ... MAY ALSO /BE REMOVED/. RESULTING /IN/ INACTIVE METABOLITES /HUMAN, ORAL/.

American Society of Hospital Pharmacists. Data supplied on contract from American Hospital Formulary Service and other current ASHP sources., p. 1975


Hepatic biotransformation, primarily by the hepatic microsomal enzyme system. /barbiturates/

United States Pharmacopeial Convention; USP Dispensing Information 12th ed Vol IA p.574 (1992)


Partially metabolized in the liver by oxidation of the C5 substituent(s) (allyl and/or isopropyl groups). Removal of the allyl group at C5 may also occur. The resulting inactive metbolites, which have not been identified are excreted in the urine.

McEvoy, G.K. (ed.). American Hospital Formulary Service - Drug Information 92. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1992 (Plus Supplements 1992)., p. 1322


With the exception of the less lipid-soluble aprobarbital and phenobarbital, nearly complete metabolism and/or conjugation of barbiturates in the liver precedes their renal excretion. The oxidation of radicals at C5 is the most important biotransformation responsible for termination of biological activity. Oxidation results in the formation of alcohols, ketones, phenols, or carboxylic acids, which may appear in the urine as such or as glucuronic acid conjugates. In some instances (eg, phenobarbital), N-glucosylation is an important metabolic pathway. Other biotransformations include N-hydroxylation, desulfuration of thiobarbiturates to oxybarbiturates, opening of the barbituric acid ring, and N-dealkylation of N-alkylbarbiturates to active metabolites (eg, mephobarbital to phenobarbital).

Gilman, A.G., T.W. Rall, A.S. Nies and P. Taylor (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 8th ed. New York, NY. Pergamon Press, 1990., p. 361


5.4 Biological Half-Life

APROBARBITAL DOSE 0.75 G ORAL REACHED CONCN 2.3 MG% IN 3-9 HR; T/2 WAS 24-36 HR. /FROM TABLE/

Sunshine, I. (ed.). CRC Handbook of Analytical Toxicology. Cleveland: The Chemical Rubber Co., 1969., p. 336


Plasma half-life is about 14 fto 40 hours.

McEvoy, G.K. (ed.). American Hospital Formulary Service - Drug Information 92. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1992 (Plus Supplements 1992)., p. 1322


5.5 Mechanism of Action

Aprobarbital (like all barbiturates) works by binding to the GABAA receptor at either the alpha or the beta sub unit. These are binding sites that are distinct from GABA itself and also distinct from the benzodiazepine binding site. Like benzodiazepines, barbiturates potentiate the effect of GABA at this receptor. This GABAA receptor binding decreases input resistance, depresses burst and tonic firing, especially in ventrobasal and intralaminar neurons, while at the same time increasing burst duration and mean conductance at individual chloride channels; this increases both the amplitude and decay time of inhibitory postsynaptic currents. In addition to this GABA-ergic effect, barbiturates also block the AMPA receptor, a subtype of glutamate receptor. Glutamate is the principal excitatory neurotransmitter in the mammalian CNS. Aprobarbital also appears to bind neuronal nicotinic acetylcholine receptors.


... REVERSIBLY DEPRESS ACTIVITY OF ALL EXCITABLE TISSUES. ... CNS IS ... SENSITIVE, SO ... IN SEDATIVE OR HYPNOTIC DOSES, VERY LITTLE EFFECT ON SKELETAL, CARDIAC, OR SMOOTH MUSCLE OCCURS. ... PROBABLE THAT EXCITABILITY IN EACH TISSUE IS DEPRESSED BY AN ACTION ON OR IN A MEMBRANE & THAT ... MECHANISMS ... ARE ... SIMILAR. /BARBITURATES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 104


AS DOSE ... INCR, HYPOXIC & CHEM DRIVES TO RESP ARE DIMINISHED ... HOWEVER, HYPOXIC DRIVE PERSISTS @ LEVELS OF INTOXICATION CAUSING ... INSENSITIVITY OF RESP CENTERS TO CO2. ... AS INTOXICATION /INCR/ ... THERE IS SHIFT IN CONTROL OF RESP FROM CO2-SENSITIVE AREAS OF MEDULLA TO MORE PRIMITIVE ... CAROTID & AORTIC ... /BARBITURATES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 109


WHATEVER ... THE EFFECTS OF BARBITURATES ELSEWHERE IN CNS, IT IS EFFECT ON RETICULAR SYSTEM ... RESPONSIBLE FOR INABILITY TO MAINTAIN WAKEFULNESS UNDER INFLUENCE OF A BARBITURATE. /BARBITURATES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 108


BARBITURATES DECR TURNOVER OF 5-HYDROXYTRYPTAMINE & CATECHOLAMINES IN BRAIN OF EXPTL ANIMALS, BUT WHETHER THIS IS CAUSE OR EFFECT OF ANESTHESIA IS CONJECTURAL. /BARBITURATES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 106


For more Mechanism of Action (Complete) data for APROBARBITAL (10 total), please visit the HSDB record page.