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2D Structure
Also known as: Sporanox, 84625-61-6, Oriconazole, Itrizole (tn), Sporanox (tn), Itcz
Molecular Formula
C35H38Cl2N8O4
Molecular Weight
705.6  g/mol
InChI Key
VHVPQPYKVGDNFY-ZPGVKDDISA-N
FDA UNII
304NUG5GF4

A triazole antifungal agent that inhibits cytochrome P-450-dependent enzymes required for ERGOSTEROL synthesis.
Itraconazole is an Azole Antifungal. The mechanism of action of itraconazole is as a Cytochrome P450 3A4 Inhibitor, and P-Glycoprotein Inhibitor, and Breast Cancer Resistance Protein Inhibitor.
1 2D Structure

2D Structure

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
2-butan-2-yl-4-[4-[4-[4-[[(2R,4S)-2-(2,4-dichlorophenyl)-2-(1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy]phenyl]piperazin-1-yl]phenyl]-1,2,4-triazol-3-one
2.1.2 InChI
InChI=1S/C35H38Cl2N8O4/c1-3-25(2)45-34(46)44(24-40-45)29-7-5-27(6-8-29)41-14-16-42(17-15-41)28-9-11-30(12-10-28)47-19-31-20-48-35(49-31,21-43-23-38-22-39-43)32-13-4-26(36)18-33(32)37/h4-13,18,22-25,31H,3,14-17,19-21H2,1-2H3/t25?,31-,35-/m0/s1
2.1.3 InChI Key
VHVPQPYKVGDNFY-ZPGVKDDISA-N
2.1.4 Canonical SMILES
CCC(C)N1C(=O)N(C=N1)C2=CC=C(C=C2)N3CCN(CC3)C4=CC=C(C=C4)OCC5COC(O5)(CN6C=NC=N6)C7=C(C=C(C=C7)Cl)Cl
2.1.5 Isomeric SMILES
CCC(C)N1C(=O)N(C=N1)C2=CC=C(C=C2)N3CCN(CC3)C4=CC=C(C=C4)OC[C@H]5CO[C@](O5)(CN6C=NC=N6)C7=C(C=C(C=C7)Cl)Cl
2.2 Other Identifiers
2.2.1 UNII
304NUG5GF4
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Orungal

2. R 51211

3. R-51211

4. R51211

5. Sporanox

2.3.2 Depositor-Supplied Synonyms

1. Sporanox

2. 84625-61-6

3. Oriconazole

4. Itrizole (tn)

5. Sporanox (tn)

6. Itcz

7. Itrizole

8. Itraconazol

9. Orungal

10. Sporonox

11. Itraconazole (sporanox)

12. 2-butan-2-yl-4-[4-[4-[4-[[(2r,4s)-2-(2,4-dichlorophenyl)-2-(1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy]phenyl]piperazin-1-yl]phenyl]-1,2,4-triazol-3-one

13. 873066-43-4

14. R-51211

15. Itraconazol [spanish]

16. Itraconazolum [latin]

17. Triasporin

18. Candistat

19. Canditral

20. Itralek

21. Sempera

22. Sporamelt

23. Traconal

24. Chembl22587

25. Itrac

26. Cis-itraconazole

27. Chebi:6076

28. Spherazole Cr

29. Spherazole Ir

30. R51211

31. Nsc-759239

32. Itz

33. Dsstox_cid_3180

34. Dsstox_rid_76908

35. (2r,4s)-itraconazole (mixture Of Diastereomers)

36. Dsstox_gsid_23180

37. Fungitraxx

38. Cladosal 100

39. 2-(butan-2-yl)-4-{4-[4-(4-{[(2r,4s)-2-(2,4-dichlorophenyl)-2-(1h-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy}phenyl)piperazin-1-yl]phenyl}-2,4-dihydro-3h-1,2,4-triazol-3-one

40. 4-[4-[4-[4-[[(2r,4s)-2-(2,4-dichlorophenyl)-2-(1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy]phenyl]piperazin-1-yl]phenyl]-2-sec-butyl-1,2,4-triazol-3-one

41. Cas-84625-61-6

42. 304nug5gf4

43. Intraconazole

44. Itraconazolo

45. Sporanox(tm)

46. Ncgc00018268-03

47. 3h-1,2,4-triazol-3-one, 4-(4-(4-(4-((2-(2,4-dichlorophenyl)-2-(1h-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl)methoxy)phenyl)-1-piperazinyl)phenyl)-2,4-dihydro-2-(1-methylpropyl)-

48. 4-(4-{4-[4-({[(2r,4s)-2-(2,4-dichlorophenyl)-2-(1h-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methyl}oxy)phenyl]piperazin-1-yl}phenyl)-2-(1-methylpropyl)-2,4-dihydro-3h-1,2,4-triazol-3-one

49. 84604-65-9

50. Itraconazole & Nyotran

51. R 51,211

52. Itraconazole [mi]

53. Itraconazole [inn]

54. Itraconazole [jan]

55. Itraconazole [inci]

56. Itraconazole [usan]

57. Itraconazole (jp17/usp)

58. Itraconazole [vandf]

59. Schembl23934

60. Itraconazole [mart.]

61. Mls006011958

62. Itraconazole [usp-rs]

63. Itraconazole [who-dd]

64. Amy922

65. Dtxsid3023180

66. Gtpl11426

67. Itraconazole [green Book]

68. Itraconazole [ep Impurity]

69. Itraconazole [orange Book]

70. Pharmakon1600-01505756

71. Itraconazole [ep Monograph]

72. 4-(4-(4-(4-((2-((1h-1,2,4-triazol-1-yl)methyl)-2-(2,4-dichlorophenyl)-1,3-dioxolan-4-yl)methoxy)phenyl)piperazin-1-yl)phenyl)-2-(sec-butyl)-2,4-dihydro-3h-1,2,4-triazol-3-one

73. Itraconazole [usp Monograph]

74. Tox21_110854

75. Ac-542

76. Bdbm50127138

77. Nsc759239

78. S2476

79. Akos015842738

80. Akos015961385

81. Tox21_110854_1

82. Ccg-270391

83. Db01167

84. Ks-1268

85. Ncgc00274068-01

86. Ncgc00274068-02

87. Ncgc00274068-07

88. 1-(butan-2-yl)-4-{4-[4-(4-{[(2r,4s)-2-(2,4-dichlorophenyl)-2-(1h-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy}phenyl)piperazin-1-yl]phenyl}-4,5-dihydro-1h-1,2,4-triazol-5-one

89. 4-(4-(4-(4-(((2r,4s)-2-((1h-1,2,4-triazol-1-yl)methyl)-2-(2,4-dichlorophenyl)-1,3-dioxolan-4-yl)methoxy)phenyl)piperazin-1-yl)phenyl)-2-(sec-butyl)-2,4-dihydro-3h-1,2,4-triazol-3-one

90. Hy-17514

91. Smr001827898

92. Itraconazole & Nyotran(liposomal Nystatin)

93. Sbi-0206914.p001

94. Itraconazole (ema Epar: Veterinary)

95. Sw219756-1

96. Itraconazole 2.0 Mg/ml In Dimethyl Sulfoxide

97. D00350

98. Suba-itraconazole Component Itraconazole

99. Ab01274818-01

100. Ab01274818_02

101. Ab01274818_03

102. A933954

103. Itraconazole Component Of Suba-itraconazole

104. Q411229

105. Brd-a23067620-001-01-7

106. (+/-)-1-sec-butyl-4-(p-(4-(p-(((2r*,4s*)-2-(2,4-dichlorophenyl)-2-(1h-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl)methoxy)phenyl)-1-piperazinyl)phenyl)-.delta.(sup 2)-1,2,4-triazolin-5-one

107. 3h-1,2,4-triazol-3-one, 4-[4-[4-[4-[[2-(2,4-dichlorophenyl)-2-(1h-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy]phenyl]-1-pipera-zinyl]phenyl]-2,4-dihydro-2-(1-methylpropyl)

108. 4-[4-[4-[4-[[(2r,4s)-2-(2,4-dichlorophenyl)-2-(1h-1,2,4-triazole-1-ylmethyl)-1,3-dioxolane-4-yl]methoxy]phenyl]piperazino]phenyl]-2-(1-methylpropyl)-4h-1,2,4-triazole-3(2h)-one

2.4 Create Date
2005-06-24
3 Chemical and Physical Properties
Molecular Weight 705.6 g/mol
Molecular Formula C35H38Cl2N8O4
XLogP35.7
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count9
Rotatable Bond Count11
Exact Mass704.2393071 g/mol
Monoisotopic Mass704.2393071 g/mol
Topological Polar Surface Area101 Ų
Heavy Atom Count49
Formal Charge0
Complexity1120
Isotope Atom Count0
Defined Atom Stereocenter Count2
Undefined Atom Stereocenter Count1
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 NameItraconazole
PubMed HealthItraconazole (By mouth)
Drug ClassesAntifungal
Drug LabelSPORANOX is the brand name for itraconazole, a synthetic triazole antifungal agent. Itraconazole is a 1:1:1:1 racemic mixture of four diastereomers (two enantiomeric pairs), each possessing three chiral centers. It may be represented by the followi...
Active IngredientItraconazole
Dosage FormCapsule
RouteOral
Strength100mg
Market StatusPrescription
CompanyMylan Pharms; Sandoz

2 of 4  
Drug NameSporanox
PubMed HealthItraconazole (By mouth)
Drug ClassesAntifungal
Drug LabelSPORANOX is the brand name for itraconazole, a synthetic triazole antifungal agent. Itraconazole is a 1:1:1:1 racemic mixture of four diastereomers (two enantiomeric pairs), each possessing three chiral centers. It may be represented by the followi...
Active IngredientItraconazole
Dosage FormCapsule; Solution
Routeoral; Oral
Strength10mg/ml; 100mg
Market StatusPrescription
CompanyJanssen Pharms; Janssen Pharma

3 of 4  
Drug NameItraconazole
PubMed HealthItraconazole (By mouth)
Drug ClassesAntifungal
Drug LabelSPORANOX is the brand name for itraconazole, a synthetic triazole antifungal agent. Itraconazole is a 1:1:1:1 racemic mixture of four diastereomers (two enantiomeric pairs), each possessing three chiral centers. It may be represented by the followi...
Active IngredientItraconazole
Dosage FormCapsule
RouteOral
Strength100mg
Market StatusPrescription
CompanyMylan Pharms; Sandoz

4 of 4  
Drug NameSporanox
PubMed HealthItraconazole (By mouth)
Drug ClassesAntifungal
Drug LabelSPORANOX is the brand name for itraconazole, a synthetic triazole antifungal agent. Itraconazole is a 1:1:1:1 racemic mixture of four diastereomers (two enantiomeric pairs), each possessing three chiral centers. It may be represented by the followi...
Active IngredientItraconazole
Dosage FormCapsule; Solution
Routeoral; Oral
Strength10mg/ml; 100mg
Market StatusPrescription
CompanyJanssen Pharms; Janssen Pharma

4.2 Therapeutic Uses

Antifungal Agents; Antiprotozoal Agents

National Library of Medicine's Medical Subject Headings online file (MeSH, 2009)


Itraconazole capsules are indicated for the treatment of the following fungal infections in immunocompromised and non-immunocompromised patients: Blastomycosis, pulmonary and extrapulmonary; Histoplasmosis, including chronic cavitary pulmonary disease and disseminated, non-meningeal histoplasmosis and Aspergillosis, pulmonary and extrapulmonary, in patients who are intolerant of or who are refractory to amphotericin B therapy. /Included in US product label/

US Natl Inst Health; DailyMed. Current Medication Information for Itraconazole (itraconazole) capsule (February 2010). Available from, as of September 27, 2010: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=16279


Itraconazole capsules are also indicated for the treatment of the following fungal infections in non-immunocompromised patients: Onychomycosis of the toenail, with or without fingernail involvement, due to dermatophytes (tinea unguium) and Onychomycosis of the fingernail due to dermatophytes (tinea unguium). /Included in US product label/

US Natl Inst Health; DailyMed. Current Medication Information for Itraconazole (itraconazole) capsule (February 2010). Available from, as of September 27, 2010: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=16279


4.3 Drug Warning

/BOXED WARNING/ Congestive Heart Failure, Cardiac Effects: Itraconazole capsules should not be administered for the treatment of onychomycosis in patients with evidence of ventricular dysfunction such as congestive heart failure (CHF) or a history of CHF. If signs or symptoms of congestive heart failure occur during administration of itraconazole capsules, discontinue administration. When itraconazole was administered intravenously to dogs and healthy human volunteers, negative inotropic effects were seen.

US Natl Inst Health; DailyMed. Current Medication Information for Itraconazole (itraconazole) capsule (Updated: June 2014). Available from, as of April 24, 2015: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d343050e-00bb-440c-a24b-7cd18c97e184


/BOXED WARNING/ Drug Interactions: Coadministration of the following drugs are contraindicated with itraconazole capsules: methadone, disopyramide, dofetilide, dronedarone, quinidine, ergot alkaloids (such as dihydroergotamine, ergometrine (ergonovine), ergotamine, methylergometrine (methylergonovine)), irinotecan, lurasidone, oral midazolam, pimozide, triazolam, felodipine, nisoldipine, ranolazine, eplerenone, cisapride, lovastatin, simvastatin and, in subjects with renal or hepatic impairment, colchicine. Coadministration with itraconazole can cause elevated plasma concentrations of these drugs and may increase or prolong both the pharmacologic effects and/or adverse reactions to these drugs. For example, increased plasma concentrations of some of these drugs can lead to QT prolongation and ventricular tachyarrhythmias including occurrences of torsades de pointes, a potentially fatal arrhythmia.

US Natl Inst Health; DailyMed. Current Medication Information for Itraconazole (itraconazole) capsule (Updated: June 2014). Available from, as of April 24, 2015: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d343050e-00bb-440c-a24b-7cd18c97e184


Itraconazole is contraindicated in patients with known hypersensitivity to the drug or any ingredient in the formulation. Although information concerning cross-sensitivity between itraconazole and other triazole or imidazole antifungal agents is not available, the manufacturer states that itraconazole should be used with caution in individuals hypersensitive to other azoles.

American Society of Health System Pharmacists; AHFS Drug Information 2010. Bethesda, MD. (2010), p. 531


Adverse GI effects have been reported in about 1-11% of patients receiving IV or oral itraconazole for the treatment of systemic fungal infections or oropharyngeal or esophageal candidiasis or for empiric anti-fungal therapy. These adverse GI effects usually are transient and respond to symptomatic treatment without alteration of itraconazole therapy; however, reduction of dosage or discontinuance of the drug occasionally may be required.

American Society of Health System Pharmacists; AHFS Drug Information 2010. Bethesda, MD. (2010), p. 530


For more Drug Warnings (Complete) data for Itraconazole (27 total), please visit the HSDB record page.


4.4 Drug Indication

For the treatment of the following fungal infections in immunocompromised and non-immunocompromised patients: pulmonary and extrapulmonary blastomycosis, histoplasmosis, aspergillosis, and onychomycosis.


FDA Label


For the treatment of aspergillosis and candidiasis in companion birds


5 Pharmacology and Biochemistry
5.1 Pharmacology

Itraconazole is an imidazole/triazole type antifungal agent. Itraconazole is a highly selective inhibitor of fungal cytochrome P-450 sterol C-14 α-demethylation via the inhibition of the enzyme cytochrome P450 14α-demethylase. This enzyme converts lanosterol to ergosterol, and is required in fungal cell wall synthesis. The subsequent loss of normal sterols correlates with the accumulation of 14 α-methyl sterols in fungi and may be partly responsible for the fungistatic activity of fluconazole. Mammalian cell demethylation is much less sensitive to fluconazole inhibition. Itraconazole exhibits in vitro activity against Cryptococcus neoformans and Candida spp. Fungistatic activity has also been demonstrated in normal and immunocompromised animal models for systemic and intracranial fungal infections due to Cryptococcus neoformans and for systemic infections due to Candida albicans.


5.2 MeSH Pharmacological Classification

14-alpha Demethylase Inhibitors

Compounds that specifically inhibit STEROL 14-DEMETHYLASE. A variety of azole-derived ANTIFUNGAL AGENTS act through this mechanism. (See all compounds classified as 14-alpha Demethylase Inhibitors.)


Antifungal Agents

Substances that destroy fungi by suppressing their ability to grow or reproduce. They differ from FUNGICIDES, INDUSTRIAL because they defend against fungi present in human or animal tissues. (See all compounds classified as Antifungal Agents.)


Cytochrome P-450 CYP3A Inhibitors

Drugs and compounds which inhibit or antagonize the biosynthesis or actions of CYTOCHROME P-450 CYP3A. (See all compounds classified as Cytochrome P-450 CYP3A Inhibitors.)


5.3 FDA Pharmacological Classification
5.3.1 Active Moiety
ITRACONAZOLE
5.3.2 FDA UNII
304NUG5GF4
5.3.3 Pharmacological Classes
Azoles [CS]; Breast Cancer Resistance Protein Inhibitors [MoA]; Cytochrome P450 3A4 Inhibitors [MoA]; P-Glycoprotein Inhibitors [MoA]; Azole Antifungal [EPC]
5.4 ATC Code

QJ02AC02


J02AC02

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


J - Antiinfectives for systemic use

J02 - Antimycotics for systemic use

J02A - Antimycotics for systemic use

J02AC - Triazole and tetrazole derivatives

J02AC02 - Itraconazole


5.5 Absorption, Distribution and Excretion

Absorption

The absolute oral bioavailability of itraconazole is 55%, and is maximal when taken with a full meal.


Route of Elimination

Itraconazole is metabolized predominately by the cytochrome P450 3A4 isoenzyme system (CYP3A4) in the liver, resulting in the formation of several metabolites, including hydroxyitraconazole, the major metabolite. Fecal excretion of the parent drug varies between 3-18% of the dose. Renal excretion of the parent drug is less than 0.03% of the dose. About 40% of the dose is excreted as inactive metabolites in the urine. No single excreted metabolite represents more than 5% of a dose.


Volume of Distribution

796 185 L


Clearance

381 +/- 95 mL/minute [IV administration]


The pharmacokinetics of itraconazole after intravenous administration and its absolute oral bioavailability from an oral solution were studied in a randomized crossover study in 6 healthy male volunteers. The observed absolute oral bioavailability of itraconazole was 55%.

US Natl Inst Health; DailyMed. Current Medication Information for Itraconazole (itraconazole) capsule (February 2010). Available from, as of September 27, 2010: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=16279


The oral bioavailability of itraconazole is maximal when itraconazole capsules are taken with a full meal. The pharmacokinetics of itraconazole were studied in 6 healthy male volunteers who received, in a crossover design, single 100 mg doses of itraconazole as a polyethylene glycol capsule, with or without a full meal. The same 6 volunteers also received 50 mg or 200 mg with a full meal in a crossover design. In this study, only itraconazole plasma concentrations were measured. The respective pharmacokinetic parameters for itraconazole are presented in the table /provided/.

Table: Oral Bioavailability of Itraconazole (Itraconazole capsules): [Table#7591]

US Natl Inst Health; DailyMed. Current Medication Information for Itraconazole (itraconazole) capsule (February 2010). Available from, as of September 27, 2010: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=16279


[Table#7591]


Steady-state concentrations were reached within 15 days following oral doses of 50 mg to 400 mg daily. Values given in the table below are data at steady-state from a pharmacokinetics study in which 27 healthy male volunteers took 200 mg itraconazole capsules b.i.d. (with a full meal) for 15 days [Table#7592]

US Natl Inst Health; DailyMed. Current Medication Information for Itraconazole (itraconazole) capsule (February 2010). Available from, as of September 27, 2010: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=16279


[Table#7592]


Thirty healthy men received single 200 mg doses of itraconazole capsules under fasted conditions either 1) with water; 2) with water, after ranitidine 150 mg b.i.d. for 3 days; or 3) with cola, after ranitidine 150 mg b.i.d. for 3 days. When itraconazole capsules were administered after ranitidine pretreatment, itraconazole was absorbed to a lesser extent than when itraconazole capsules were administered alone, with decreases in AUC0-24 and Cmax of 39% +/- 37% and 42% +/- 39%, respectively. When itraconazole capsules were administered with cola after ranitidine pretreatment, itraconazole absorption was comparable to that observed when itraconazole capsules were administered alone.

US Natl Inst Health; DailyMed. Current Medication Information for Itraconazole (itraconazole) capsule (February 2010). Available from, as of September 27, 2010: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=16279


For more Absorption, Distribution and Excretion (Complete) data for Itraconazole (11 total), please visit the HSDB record page.


5.6 Metabolism/Metabolites

Itraconazole is extensively metabolized by the liver into a large number of metabolites, including hydroxyitraconazole, the major metabolite. The main metabolic pathways are oxidative scission of the dioxolane ring, aliphatic oxidation at the 1-methylpropyl substituent, N-dealkylation of this 1-methylpropyl substituent, oxidative degradation of the piperazine ring and triazolone scission.


Itraconazole is metabolized predominantly by the cytochrome P450 3A4 isoenzyme system (CYP3A4), resulting in the formation of several metabolites, including hydroxyitraconazole, the major metabolite. Results of a pharmacokinetics study suggest that itraconazole may undergo saturable metabolism with multiple dosing.

US Natl Inst Health; DailyMed. Current Medication Information for Itraconazole (itraconazole) capsule (February 2010). Available from, as of September 27, 2010: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=16279


Itraconazole (ITZ) is metabolized in vitro to three inhibitory metabolites: hydroxy-itraconazole (OH-ITZ), keto-itraconazole (keto-ITZ), and N-desalkyl-itraconazole (ND-ITZ). The goal of this study was to determine the contribution of these metabolites to drug-drug interactions caused by ITZ. Six healthy volunteers received 100 mg ITZ orally for 7 days, and pharmacokinetic analysis was conducted at days 1 and 7 of the study. The extent of CYP3A4 inhibition by ITZ and its metabolites was predicted using this data. ITZ, OH-ITZ, keto-ITZ, and ND-ITZ were detected in plasma samples of all volunteers. A 3.9-fold decrease in the hepatic intrinsic clearance of a CYP3A4 substrate was predicted using the average unbound steady-state concentrations (C(ss,ave,u)) and liver microsomal inhibition constants for ITZ, OH-ITZ, keto-ITZ, and ND-ITZ. Accounting for circulating metabolites of ITZ significantly improved the in vitro to in vivo extrapolation of CYP3A4 inhibition compared to a consideration of ITZ exposure alone.

PMID:17495874 Full text: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3488349 Templeton IE et al; Clin Pharmacol Ther 83 (1): 77-85 (2008)


5.7 Biological Half-Life

21 hours


5.8 Mechanism of Action

Itraconazole interacts with 14-α demethylase, a cytochrome P-450 enzyme necessary to convert lanosterol to ergosterol. As ergosterol is an essential component of the fungal cell membrane, inhibition of its synthesis results in increased cellular permeability causing leakage of cellular contents. Itraconazole may also inhibit endogenous respiration, interact with membrane phospholipids, inhibit the transformation of yeasts to mycelial forms, inhibit purine uptake, and impair triglyceride and/or phospholipid biosynthesis.


In vitro studies have demonstrated that itraconazole inhibits the cytochrome P450-dependent synthesis of ergosterol, which is a vital component of fungal cell membranes.

US Natl Inst Health; DailyMed. Current Medication Information for Itraconazole (itraconazole) capsule (February 2010). Available from, as of September 27, 2010: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=16279