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Identification
NameTerfenadine
Accession NumberDB00342  (APRD00606)
TypeSmall Molecule
GroupsWithdrawn
Description

In the U.S., Terfenadine was superseded by fexofenadine in the 1990s due to the risk of cardiac arrhythmia caused by QT interval prolongation.

Structure
Thumb
Synonyms
(RS)-1-(4-tert-butylphenyl)-4-{4-[hydroxy(diphenyl)methyl]piperidin-1-yl}-butan-1-ol
Terfenadin
Terfenadina
Terfénadine
Terfenadine
Terfenadinum
External Identifiers
  • RMI 9918
Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing End
Allergy Relieftablet60 mgoralJcp Laboratories Inc.1994-12-311998-08-12Canada 5f16b84899037e23705f146ff57e3794121879cb055f0954756d94bc690476b4
Novo-terfenadine Tab 60mgtablet60 mgoralNovopharm Limited1993-12-311999-11-15Canada 5f16b84899037e23705f146ff57e3794121879cb055f0954756d94bc690476b4
Safeway Once A Day Allergy Caplet 120mgtablet120 mgoralJcp Laboratories Inc.1991-12-311997-01-13Canada 5f16b84899037e23705f146ff57e3794121879cb055f0954756d94bc690476b4
Seldane - Sus 30mg/5mlsuspension30 mgoralHoechst Marion Roussel Canada Inc.1995-12-311998-08-12Canada 5f16b84899037e23705f146ff57e3794121879cb055f0954756d94bc690476b4
Seldane - Tab 60mgtablet60 mgoralHoechst Marion Roussel Canada Inc.1996-10-071998-08-12Canada 5f16b84899037e23705f146ff57e3794121879cb055f0954756d94bc690476b4
Seldane 120mg Once-A-day Capletstablet120 mgoralHoechst Marion Roussel Canada Inc.1995-12-311998-08-12Canada 5f16b84899037e23705f146ff57e3794121879cb055f0954756d94bc690476b4
Seldane Sus 6mg/mlsuspension6 mgoralMerrell Dow Pharmaceuticals (Canada) Inc., Division Of Mmdc1985-12-311996-09-09Canada 5f16b84899037e23705f146ff57e3794121879cb055f0954756d94bc690476b4
Seldane Tab 120mgtablet120 mgoralMerrell Dow Pharmaceuticals (Canada) Inc., Division Of Mmdc1988-12-311997-08-05Canada 5f16b84899037e23705f146ff57e3794121879cb055f0954756d94bc690476b4
Seldane Tab 60mgtablet60 mgoralMerrell Pharms Inc., Division Of Merrell Dow (Can)1983-12-311997-08-05Canada 5f16b84899037e23705f146ff57e3794121879cb055f0954756d94bc690476b4
Generic Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing End
Apo-terfenadine Tab 120mgtablet120 mgoralApotex Inc1993-12-311999-12-08Canada 5f16b84899037e23705f146ff57e3794121879cb055f0954756d94bc690476b4
Apo-terfenadine Tablets 60mgtablet60 mgoralApotex Inc1993-12-311999-12-08Canada 5f16b84899037e23705f146ff57e3794121879cb055f0954756d94bc690476b4
Over the Counter ProductsNot Available
International Brands
NameCompany
BronalGalenika
DaylertMicro Labs
SeldaneNot Available
ServininNovartis
TeldaneNot Available
TerfedCipla
Terfenadin ALAliud
Terfenadine FLXAccord Healthcare
TerfinInterbat
TernadinDunar
TrexylRanbaxy
TriludanNot Available
Brand mixturesNot Available
SaltsNot Available
Categories
UNII7BA5G9Y06Q
CAS number50679-08-8
WeightAverage: 471.6734
Monoisotopic: 471.313729561
Chemical FormulaC32H41NO2
InChI KeyInChIKey=GUGOEEXESWIERI-UHFFFAOYSA-N
InChI
InChI=1S/C32H41NO2/c1-31(2,3)26-18-16-25(17-19-26)30(34)15-10-22-33-23-20-29(21-24-33)32(35,27-11-6-4-7-12-27)28-13-8-5-9-14-28/h4-9,11-14,16-19,29-30,34-35H,10,15,20-24H2,1-3H3
IUPAC Name
1-(4-tert-butylphenyl)-4-[4-(hydroxydiphenylmethyl)piperidin-1-yl]butan-1-ol
SMILES
CC(C)(C)C1=CC=C(C=C1)C(O)CCCN1CCC(CC1)C(O)(C1=CC=CC=C1)C1=CC=CC=C1
Taxonomy
DescriptionThis compound belongs to the class of organic compounds known as diphenylmethanes. These are compounds containing a diphenylmethane moiety, which consists of a methane wherein two hydrogen atoms are replaced by two phenyl groups.
KingdomOrganic compounds
Super ClassBenzenoids
ClassBenzene and substituted derivatives
Sub ClassDiphenylmethanes
Direct ParentDiphenylmethanes
Alternative Parents
Substituents
  • Diphenylmethane
  • Phenylbutylamine
  • Phenylpropane
  • Aralkylamine
  • Piperidine
  • Tertiary alcohol
  • Tertiary aliphatic amine
  • Tertiary amine
  • Secondary alcohol
  • Azacycle
  • Organoheterocyclic compound
  • Hydrocarbon derivative
  • Aromatic alcohol
  • Organooxygen compound
  • Organonitrogen compound
  • Amine
  • Alcohol
  • Aromatic heteromonocyclic compound
Molecular FrameworkAromatic heteromonocyclic compounds
External DescriptorsNot Available
Pharmacology
IndicationFor the treatment of allergic rhinitis, hay fever, and allergic skin disorders.
PharmacodynamicsTerfenadine, an H1-receptor antagonist antihistamine, is similar in structure to astemizole and haloperidol, a butyrophenone antipsychotic. The active metabolite of terfenadine is fexofenadine.
Mechanism of actionTerfenadine competes with histamine for binding at H1-receptor sites in the GI tract, uterus, large blood vessels, and bronchial muscle. This reversible binding of terfenadine to H1-receptors suppresses the formation of edema, flare, and pruritus resulting from histaminic activity. As the drug does not readily cross the blood-brain barrier, CNS depression is minimal.
AbsorptionOn the basis of a mass balance study using 14C labeled terfenadine the oral absorption of terfenadine was estimated to be at least 70%
Volume of distributionNot Available
Protein binding70%
Metabolism

Hepatic

SubstrateEnzymesProduct
Terfenadine
fexofenadineDetails
Route of eliminationNot Available
Half life3.5 hours
ClearanceNot Available
ToxicityMild (e.g., headache, nausea, confusion), but adverse cardiac events including cardiac arrest, ventricular arrhythmias including torsades de pointes and QT prolongation have been reported. LD50=mg/kg (orally in mice)
Affected organisms
  • Humans and other mammals
PathwaysNot Available
SNP Mediated EffectsNot Available
SNP Mediated Adverse Drug ReactionsNot Available
ADMET
Predicted ADMET features
PropertyValueProbability
Human Intestinal Absorption+0.9535
Blood Brain Barrier+0.5319
Caco-2 permeable+0.6691
P-glycoprotein substrateSubstrate0.8338
P-glycoprotein inhibitor IInhibitor0.7145
P-glycoprotein inhibitor IIInhibitor0.5515
Renal organic cation transporterInhibitor0.5731
CYP450 2C9 substrateNon-substrate0.8286
CYP450 2D6 substrateSubstrate0.7689
CYP450 3A4 substrateSubstrate0.6664
CYP450 1A2 substrateInhibitor0.5553
CYP450 2C9 inhibitorNon-inhibitor0.9071
CYP450 2D6 inhibitorInhibitor0.8932
CYP450 2C19 inhibitorInhibitor0.5229
CYP450 3A4 inhibitorNon-inhibitor0.8309
CYP450 inhibitory promiscuityLow CYP Inhibitory Promiscuity0.9627
Ames testNon AMES toxic0.8907
CarcinogenicityNon-carcinogens0.8443
BiodegradationNot ready biodegradable0.9683
Rat acute toxicity2.0063 LD50, mol/kg Not applicable
hERG inhibition (predictor I)Weak inhibitor0.5556
hERG inhibition (predictor II)Inhibitor0.8014
ADMET data is predicted using admetSAR, a free tool for evaluating chemical ADMET properties. (23092397 )
Pharmacoeconomics
ManufacturersNot Available
Packagers
  • Pharmaceutical Utilization Management Program VA Inc.
  • Pharmedix
  • Veratex Corp.
Dosage forms
FormRouteStrength
Tabletoral60 mg
Tabletoral120 mg
Suspensionoral30 mg
Suspensionoral6 mg
PricesNot Available
PatentsNot Available
Properties
StateSolid
Experimental Properties
PropertyValueSource
melting point147 °CPhysProp
water solubility0.0963 mg/L (at 25 °C)MCFARLAND,JW ET AL. (2001)
logP7.1Not Available
Predicted Properties
PropertyValueSource
Water Solubility0.000458 mg/mLALOGPS
logP5.89ALOGPS
logP6.48ChemAxon
logS-6ALOGPS
pKa (Strongest Acidic)13.2ChemAxon
pKa (Strongest Basic)9.02ChemAxon
Physiological Charge1ChemAxon
Hydrogen Acceptor Count3ChemAxon
Hydrogen Donor Count2ChemAxon
Polar Surface Area43.7 Å2ChemAxon
Rotatable Bond Count9ChemAxon
Refractivity146.27 m3·mol-1ChemAxon
Polarizability56.45 Å3ChemAxon
Number of Rings4ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectra
Mass Spec (NIST)Not Available
Spectra
Spectrum TypeDescriptionSplash Key
MSMass Spectrum (Electron Ionization)splash10-xxz0300000-2c6ad1195e498f463cbfView in MoNA
References
Synthesis Reference

Timothy G. Fawcett, Christian T. Goralski, David W. Ziettlow, “Preparation of polymorphically pure terfenadine.” U.S. Patent US4742175, issued April, 1975.

US4742175
General ReferencesNot Available
External Links
ATC CodesR06AX12
AHFS CodesNot Available
PDB EntriesNot Available
FDA labelNot Available
MSDSDownload (72.9 KB)
Interactions
Drug Interactions
Drug
AtazanavirThe serum concentration of Terfenadine can be increased when it is combined with Atazanavir.
AzithromycinAzithromycin may increase the QTc-prolonging activities of Terfenadine.
BicalutamideThe serum concentration of Terfenadine can be increased when it is combined with Bicalutamide.
BoceprevirThe serum concentration of Terfenadine can be increased when it is combined with Boceprevir.
CeritinibThe serum concentration of Terfenadine can be increased when it is combined with Ceritinib.
ClarithromycinClarithromycin may increase the QTc-prolonging activities of Terfenadine.
CobicistatThe serum concentration of Terfenadine can be increased when it is combined with Cobicistat.
DarunavirThe serum concentration of Terfenadine can be increased when it is combined with Darunavir.
DelavirdineDelavirdine may increase the arrhythmogenic activities of Terfenadine.
ErythromycinErythromycin may increase the QTc-prolonging activities of Terfenadine.
FosaprepitantThe serum concentration of Terfenadine can be increased when it is combined with Fosaprepitant.
IdelalisibThe serum concentration of Terfenadine can be increased when it is combined with Idelalisib.
IndinavirThe serum concentration of Terfenadine can be increased when it is combined with Indinavir.
ItraconazoleThe serum concentration of Terfenadine can be increased when it is combined with Itraconazole.
KetoconazoleKetoconazole may increase the QTc-prolonging activities of Terfenadine.
NefazodoneThe serum concentration of Terfenadine can be increased when it is combined with Nefazodone.
NelfinavirThe serum concentration of Terfenadine can be increased when it is combined with Nelfinavir.
PosaconazoleThe serum concentration of Terfenadine can be increased when it is combined with Posaconazole.
RitonavirThe serum concentration of Terfenadine can be increased when it is combined with Ritonavir.
SaquinavirThe serum concentration of Terfenadine can be increased when it is combined with Saquinavir.
SpiramycinSpiramycin may increase the QTc-prolonging activities of Terfenadine.
TelaprevirThe serum concentration of Terfenadine can be increased when it is combined with Telaprevir.
TelithromycinTelithromycin may increase the QTc-prolonging activities of Terfenadine.
VoriconazoleThe serum concentration of Terfenadine can be increased when it is combined with Voriconazole.
Food InteractionsNot Available

Targets

1. Histamine H1 receptor

Kind: Protein

Organism: Human

Pharmacological action: yes

Actions: antagonist

Components

Name UniProt ID Details
Histamine H1 receptor P35367 Details

References:

  1. Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. Pubmed
  2. Kishimoto W, Hiroi T, Sakai K, Funae Y, Igarashi T: Metabolism of epinastine, a histamine H1 receptor antagonist, in human liver microsomes in comparison with that of terfenadine. Res Commun Mol Pathol Pharmacol. 1997 Dec;98(3):273-92. Pubmed
  3. Salata JJ, Jurkiewicz NK, Wallace AA, Stupienski RF 3rd, Guinosso PJ Jr, Lynch JJ Jr: Cardiac electrophysiological actions of the histamine H1-receptor antagonists astemizole and terfenadine compared with chlorpheniramine and pyrilamine. Circ Res. 1995 Jan;76(1):110-9. Pubmed
  4. Wood-Baker R, Smith R, Holgate ST: A double-blind, placebo controlled study of the effect of the specific histamine H1-receptor antagonist, terfenadine, in chronic severe asthma. Br J Clin Pharmacol. 1995 Jun;39(6):671-5. Pubmed
  5. Phillips GD, Polosa R, Holgate ST: The effect of histamine-H1 receptor antagonism with terfenadine on concentration-related AMP-induced bronchoconstriction in asthma. Clin Exp Allergy. 1989 Jul;19(4):405-9. Pubmed
  6. Rafferty P, Holgate ST: Terfenadine (Seldane) is a potent and selective histamine H1 receptor antagonist in asthmatic airways. Am Rev Respir Dis. 1987 Jan;135(1):181-4. Pubmed

2. Potassium voltage-gated channel subfamily H member 2

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: inhibitor

Components

Name UniProt ID Details
Potassium voltage-gated channel subfamily H member 2 Q12809 Details

References:

  1. Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. Pubmed
  2. Gessner G, Zacharias M, Bechstedt S, Schonherr R, Heinemann SH: Molecular determinants for high-affinity block of human EAG potassium channels by antiarrhythmic agents. Mol Pharmacol. 2004 May;65(5):1120-9. Pubmed
  3. Testai L, Cecchetti V, Sabatini S, Martelli A, Breschi MC, Calderone V: Effects of K openers on the QT prolongation induced by HERG-blocking drugs in guinea-pigs. J Pharm Pharmacol. 2010 Jul;62(7):924-30. Pubmed

3. Muscarinic acetylcholine receptor M3

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: antagonist

Components

Name UniProt ID Details
Muscarinic acetylcholine receptor M3 P20309 Details

References:

  1. Yasuda SU, Yasuda RP: Affinities of brompheniramine, chlorpheniramine, and terfenadine at the five human muscarinic cholinergic receptor subtypes. Pharmacotherapy. 1999 Apr;19(4):447-51. Pubmed

4. Muscarinic acetylcholine receptor M1

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: binder

Components

Name UniProt ID Details
Muscarinic acetylcholine receptor M1 P11229 Details

References:

  1. Yasuda SU, Yasuda RP: Affinities of brompheniramine, chlorpheniramine, and terfenadine at the five human muscarinic cholinergic receptor subtypes. Pharmacotherapy. 1999 Apr;19(4):447-51. Pubmed

5. Muscarinic acetylcholine receptor M5

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: binder

Components

Name UniProt ID Details
Muscarinic acetylcholine receptor M5 P08912 Details

References:

  1. Yasuda SU, Yasuda RP: Affinities of brompheniramine, chlorpheniramine, and terfenadine at the five human muscarinic cholinergic receptor subtypes. Pharmacotherapy. 1999 Apr;19(4):447-51. Pubmed

6. Muscarinic acetylcholine receptor M4

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: binder

Components

Name UniProt ID Details
Muscarinic acetylcholine receptor M4 P08173 Details

References:

  1. Yasuda SU, Yasuda RP: Affinities of brompheniramine, chlorpheniramine, and terfenadine at the five human muscarinic cholinergic receptor subtypes. Pharmacotherapy. 1999 Apr;19(4):447-51. Pubmed

7. Muscarinic acetylcholine receptor M2

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: binder

Components

Name UniProt ID Details
Muscarinic acetylcholine receptor M2 P08172 Details

References:

  1. Yasuda SU, Yasuda RP: Affinities of brompheniramine, chlorpheniramine, and terfenadine at the five human muscarinic cholinergic receptor subtypes. Pharmacotherapy. 1999 Apr;19(4):447-51. Pubmed

Enzymes

1. Cytochrome P450 3A4

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: substrate inhibitor inducer

Components

Name UniProt ID Details
Cytochrome P450 3A4 P08684 Details

References:

  1. Flockhart DA. Drug Interactions: Cytochrome P450 Drug Interaction Table. Indiana University School of Medicine (2007). Accessed May 28, 2010.
  2. Wang RW, Newton DJ, Liu N, Atkins WM, Lu AY: Human cytochrome P-450 3A4: in vitro drug-drug interaction patterns are substrate-dependent. Drug Metab Dispos. 2000 Mar;28(3):360-6. Pubmed
  3. Preissner S, Kroll K, Dunkel M, Senger C, Goldsobel G, Kuzman D, Guenther S, Winnenburg R, Schroeder M, Preissner R: SuperCYP: a comprehensive database on Cytochrome P450 enzymes including a tool for analysis of CYP-drug interactions. Nucleic Acids Res. 2010 Jan;38(Database issue):D237-43. Epub 2009 Nov 24. Pubmed
  4. Kishimoto W, Hiroi T, Sakai K, Funae Y, Igarashi T: Metabolism of epinastine, a histamine H1 receptor antagonist, in human liver microsomes in comparison with that of terfenadine. Res Commun Mol Pathol Pharmacol. 1997 Dec;98(3):273-92. Pubmed
  5. Nemeroff CB, DeVane CL, Pollock BG: Newer antidepressants and the cytochrome P450 system. Am J Psychiatry. 1996 Mar;153(3):311-20. Pubmed

2. Cytochrome P450 3A7

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: substrate

Components

Name UniProt ID Details
Cytochrome P450 3A7 P24462 Details

References:

  1. Flockhart DA. Drug Interactions: Cytochrome P450 Drug Interaction Table. Indiana University School of Medicine (2007). Accessed May 28, 2010.

3. Cytochrome P450 2D6

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: substrate inhibitor

Components

Name UniProt ID Details
Cytochrome P450 2D6 P10635 Details

References:

  1. Preissner S, Kroll K, Dunkel M, Senger C, Goldsobel G, Kuzman D, Guenther S, Winnenburg R, Schroeder M, Preissner R: SuperCYP: a comprehensive database on Cytochrome P450 enzymes including a tool for analysis of CYP-drug interactions. Nucleic Acids Res. 2010 Jan;38(Database issue):D237-43. Epub 2009 Nov 24. Pubmed
  2. Kishimoto W, Hiroi T, Sakai K, Funae Y, Igarashi T: Metabolism of epinastine, a histamine H1 receptor antagonist, in human liver microsomes in comparison with that of terfenadine. Res Commun Mol Pathol Pharmacol. 1997 Dec;98(3):273-92. Pubmed

4. Cytochrome P450 2C9

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: substrate

Components

Name UniProt ID Details
Cytochrome P450 2C9 P11712 Details

References:

  1. Preissner S, Kroll K, Dunkel M, Senger C, Goldsobel G, Kuzman D, Guenther S, Winnenburg R, Schroeder M, Preissner R: SuperCYP: a comprehensive database on Cytochrome P450 enzymes including a tool for analysis of CYP-drug interactions. Nucleic Acids Res. 2010 Jan;38(Database issue):D237-43. Epub 2009 Nov 24. Pubmed

5. Cytochrome P450 3A5

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: substrate

Components

Name UniProt ID Details
Cytochrome P450 3A5 P20815 Details

References:

  1. Flockhart DA. Drug Interactions: Cytochrome P450 Drug Interaction Table. Indiana University School of Medicine (2007). Accessed May 28, 2010.

6. Cytochrome P450 2C8

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: inhibitor

Components

Name UniProt ID Details
Cytochrome P450 2C8 P10632 Details

References:

  1. Preissner S, Kroll K, Dunkel M, Senger C, Goldsobel G, Kuzman D, Guenther S, Winnenburg R, Schroeder M, Preissner R: SuperCYP: a comprehensive database on Cytochrome P450 enzymes including a tool for analysis of CYP-drug interactions. Nucleic Acids Res. 2010 Jan;38(Database issue):D237-43. Epub 2009 Nov 24. Pubmed.

7. Cytochrome P450 2J2

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: inhibitor

Components

Name UniProt ID Details
Cytochrome P450 2J2 P51589 Details

References:

  1. Preissner S, Kroll K, Dunkel M, Senger C, Goldsobel G, Kuzman D, Guenther S, Winnenburg R, Schroeder M, Preissner R: SuperCYP: a comprehensive database on Cytochrome P450 enzymes including a tool for analysis of CYP-drug interactions. Nucleic Acids Res. 2010 Jan;38(Database issue):D237-43. Epub 2009 Nov 24. Pubmed

Transporters

1. Multidrug resistance protein 1

Kind: Protein

Organism: Human

Pharmacological action: unknown

Actions: inhibitor

Components

Name UniProt ID Details
Multidrug resistance protein 1 P08183 Details

References:

  1. Wang EJ, Casciano CN, Clement RP, Johnson WW: Active transport of fluorescent P-glycoprotein substrates: evaluation as markers and interaction with inhibitors. Biochem Biophys Res Commun. 2001 Nov 30;289(2):580-5. Pubmed
  2. Schwab D, Fischer H, Tabatabaei A, Poli S, Huwyler J: Comparison of in vitro P-glycoprotein screening assays: recommendations for their use in drug discovery. J Med Chem. 2003 Apr 24;46(9):1716-25. Pubmed
  3. Hait WN, Gesmonde JF, Murren JR, Yang JM, Chen HX, Reiss M: Terfenadine (Seldane): a new drug for restoring sensitivity to multidrug resistant cancer cells. Biochem Pharmacol. 1993 Jan 26;45(2):401-6. Pubmed
  4. Kim RB, Wandel C, Leake B, Cvetkovic M, Fromm MF, Dempsey PJ, Roden MM, Belas F, Chaudhary AK, Roden DM, Wood AJ, Wilkinson GR: Interrelationship between substrates and inhibitors of human CYP3A and P-glycoprotein. Pharm Res. 1999 Mar;16(3):408-14. Pubmed

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Drug created on June 13, 2005 07:24 / Updated on March 19, 2014 18:39