Basic Info

Common NameLoratadine(F04754)
2D Structure
Description

Loratadine is a tricyclic antihistamine, which has a selective and peripheral H1-antagonist action. It has a long-lasting effect and does not normally cause drowsiness because it does not readily enter the central nervous system; An antiviral that is used in the prophylactic or symptomatic treatment of influenza A. It is also used as an antiparkinsonian agent, to treat extrapyramidal reactions, and for postherpetic neuralgia. The mechanisms of its effects in movement disorders are not well understood but probably reflect an increase in synthesis and release of dopamine, with perhaps some inhibition of dopamine uptake; Loratadine is a drug used to treat allergies. It is marketed by Schering-Plough under several trade names such as Claritin, Clarityn or Claratyne depending on the market, by Lek as Lomilan and by Wyeth as Alavert. It is also available as a generic; Loratadine is a drug used to treat allergies. It is marketed by Schering-Plough under several trade names such as Claritin, Clarityn or Claratyne depending on the market, by Lek as Lomilan and by Wyeth as Alavert. It is also available as a generic. Its active metabolite, desloratadine, is also on the market, though loratadine itself is the only drug of its class available over the counter (at least in the U.S. as of 2005. Loratadine is available off the shelf in the UK.

FRCD IDF04754
CAS Number79794-75-5
PubChem CID3957
FormulaC22H23ClN2O2
IUPAC Name

ethyl 4-(8-chloro-5,6-dihydrobenzo[1,2]cyclohepta[2,4-b]pyridin-11-ylidene)piperidine-1-carboxylate

InChI Key

JCCNYMKQOSZNPW-UHFFFAOYSA-N

InChI

InChI=1S/C22H23ClN2O2/c1-2-27-22(26)25-12-9-15(10-13-25)20-19-8-7-18(23)14-17(19)6-5-16-4-3-11-24-21(16)20/h3-4,7-8,11,14H,2,5-6,9-10,12-13H2,1H3

Canonical SMILES

CCOC(=O)N1CCC(=C2C3=C(CCC4=C2N=CC=C4)C=C(C=C3)Cl)CC1

Isomeric SMILES

CCOC(=O)N1CCC(=C2C3=C(CCC4=C2N=CC=C4)C=C(C=C3)Cl)CC1

WikipediaLoratadine
Synonyms
        
            Clarityne
        
            loratadine
        
            79794-75-5
        
            Claritin
        
            Loratidine
        
            Alavert
        
            Clarityn
        
            Lisino
        
            Loracert
        
            Loradex
        
Classifies
                

                  
                    Predicted: Pesticide
                  

                
        
Update DateNov 13, 2018 17:07

Chemical Taxonomy

KingdomOrganic compounds
SuperclassOrganoheterocyclic compounds
ClassBenzocycloheptapyridines
SubclassNot available
Intermediate Tree NodesNot available
Direct ParentBenzocycloheptapyridines
Alternative Parents
Molecular FrameworkAromatic heteropolycyclic compounds
SubstituentsBenzocycloheptapyridine - Piperidinecarboxylic acid - Aryl chloride - Aryl halide - Piperidine - Pyridine - Benzenoid - Heteroaromatic compound - Carbamic acid ester - Carbonic acid derivative - Azacycle - Hydrocarbon derivative - Organic oxide - Organooxygen compound - Organonitrogen compound - Organochloride - Organohalogen compound - Carbonyl group - Organopnictogen compound - Organic oxygen compound - Organic nitrogen compound - Aromatic heteropolycyclic compound
DescriptionThis compound belongs to the class of organic compounds known as benzocycloheptapyridines. These are aromatic compounds containing a benzene ring and a pyridine ring fused to a seven membered carbocycle.

Properties

Property NameProperty Value
Molecular Weight382.888
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count3
Rotatable Bond Count2
Complexity569
Monoisotopic Mass382.145
Exact Mass382.145
XLogP5.2
Formal Charge0
Heavy Atom Count27
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Isotope Atom Count0
Covalently-Bonded Unit Count1

ADMET

Model Result Probability
Absorption
Blood-Brain BarrierBBB+0.9754
Human Intestinal AbsorptionHIA+1.0000
Caco-2 PermeabilityCaco2-0.5488
P-glycoprotein SubstrateSubstrate0.7337
P-glycoprotein InhibitorInhibitor0.9505
Inhibitor0.8387
Renal Organic Cation TransporterNon-inhibitor0.5143
Distribution
Subcellular localizationMitochondria0.7744
Metabolism
CYP450 2C9 SubstrateNon-substrate0.8197
CYP450 2D6 SubstrateSubstrate0.8918
CYP450 3A4 SubstrateSubstrate0.6770
CYP450 1A2 InhibitorNon-inhibitor0.9045
CYP450 2C9 InhibitorInhibitor0.8949
CYP450 2D6 InhibitorNon-inhibitor0.9231
CYP450 2C19 InhibitorInhibitor0.8994
CYP450 3A4 InhibitorNon-inhibitor0.8310
CYP Inhibitory PromiscuityHigh CYP Inhibitory Promiscuity0.9359
Excretion
Toxicity
Human Ether-a-go-go-Related Gene InhibitionWeak inhibitor0.7531
Inhibitor0.8456
AMES ToxicityNon AMES toxic0.6884
CarcinogensNon-carcinogens0.9150
Fish ToxicityHigh FHMT0.9859
Tetrahymena Pyriformis ToxicityHigh TPT0.9913
Honey Bee ToxicityLow HBT0.7246
BiodegradationNot ready biodegradable0.9963
Acute Oral ToxicityII0.4705
Carcinogenicity (Three-class)Non-required0.6408

Model Value Unit
Absorption
Aqueous solubility-4.5151LogS
Caco-2 Permeability0.8111LogPapp, cm/s
Distribution
Metabolism
Excretion
Toxicity
Rat Acute Toxicity2.8964LD50, mol/kg
Fish Toxicity1.0738pLC50, mg/L
Tetrahymena Pyriformis Toxicity0.8033pIGC50, ug/L

Targets

General Function:
Histamine receptor activity
Specific Function:
In peripheral tissues, the H1 subclass of histamine receptors mediates the contraction of smooth muscles, increase in capillary permeability due to contraction of terminal venules, and catecholamine release from adrenal medulla, as well as mediating neurotransmission in the central nervous system.
Gene Name:
HRH1
Uniprot ID:
P35367
Molecular Weight:
55783.61 Da
Mechanism of Action:
Like other H<sub>1</sub>-blockers, loratadine competes with free histamine for binding at H<sub>1</sub>-receptors in the GI tract, uterus, large blood vessels, and bronchial muscle. Loratadine also has a weak affinity for acetylcholine and alpha-adrenergic receptors.
References
  1. Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. [11752352 ]
General Function:
Voltage-gated potassium channel activity involved in ventricular cardiac muscle cell action potential repolarization
Specific Function:
Pore-forming (alpha) subunit of voltage-gated inwardly rectifying potassium channel. Channel properties are modulated by cAMP and subunit assembly. Mediates the rapidly activating component of the delayed rectifying potassium current in heart (IKr). Isoforms USO have no channel activity by themself, but modulates channel characteristics by forming heterotetramers with other isoforms which are retained intracellularly and undergo ubiquitin-dependent degradation.
Gene Name:
KCNH2
Uniprot ID:
Q12809
Molecular Weight:
126653.52 Da
References
  1. Taglialatela M, Secondo A, Fresi A, Rosati B, Pannaccione A, Castaldo P, Giorgio G, Wanke E, Annunziato L: Inhibition of depolarization-induced [3H]noradrenaline release from SH-SY5Y human neuroblastoma cells by some second-generation H(1) receptor antagonists through blockade of store-operated Ca(2+) channels (SOCs). Biochem Pharmacol. 2001 Nov 1;62(9):1229-38. [11705456 ]
General Function:
Quaternary ammonium group transmembrane transporter activity
Specific Function:
Mediates tubular uptake of organic compounds from circulation. Mediates the influx of agmatine, dopamine, noradrenaline (norepinephrine), serotonin, choline, famotidine, ranitidine, histamin, creatinine, amantadine, memantine, acriflavine, 4-[4-(dimethylamino)-styryl]-N-methylpyridinium ASP, amiloride, metformin, N-1-methylnicotinamide (NMN), tetraethylammonium (TEA), 1-methyl-4-phenylpyridinium (MPP), cimetidine, cisplatin and oxaliplatin. Cisplatin may develop a nephrotoxic action. Transport of creatinine is inhibited by fluoroquinolones such as DX-619 and LVFX. This transporter is a major determinant of the anticancer activity of oxaliplatin and may contribute to antitumor specificity.
Gene Name:
SLC22A2
Uniprot ID:
O15244
Molecular Weight:
62579.99 Da
References
  1. Busch AE, Karbach U, Miska D, Gorboulev V, Akhoundova A, Volk C, Arndt P, Ulzheimer JC, Sonders MS, Baumann C, Waldegger S, Lang F, Koepsell H: Human neurons express the polyspecific cation transporter hOCT2, which translocates monoamine neurotransmitters, amantadine, and memantine. Mol Pharmacol. 1998 Aug;54(2):342-52. [9687576 ]