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Record Information
Creation Date2006-10-17 09:58:23 UTC
Update Date2016-02-11 01:07:02 UTC
Secondary Accession NumbersNone
Metabolite Identification
Common NameCetirizine
DescriptionCetirizine is a medication used for the treatment of allergies, hay fever, angioedema, and hives. It is a second-generation H1-receptor antagonist antihistamine and works by blocking H1 histamine receptors. It is a major metabolite of hydroxyzine, and has the same basic side effects, including dry mouth. A potent second-generation histamine H1 antagonist that is effective in the treatment of allergic rhinitis, chronic urticaria, and pollen-induced asthma. Unlike many traditional antihistamines, it does not cause drowsiness or anticholinergic side effects. Cetirizine hydrochloride is a medication used for the treatment of allergies, hay fever, angioedema, and hives. It is a second-generation H1-receptor antagonist antihistamine and works by blocking H1 histamine receptors. It is a major metabolite of hydroxyzine, and has the same basic side effects, including dry mouth.
Cetirizine hydrochlorideHMDB
Chemical FormulaC21H25ClN2O3
Average Molecular Weight388.888
Monoisotopic Molecular Weight388.155370383
IUPAC Name2-(2-{4-[(4-chlorophenyl)(phenyl)methyl]piperazin-1-yl}ethoxy)acetic acid
Traditional Namecetirizine
CAS Registry Number83881-51-0
InChI Identifier
Chemical 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
  • Diphenylmethane
  • Aralkylamine
  • N-alkylpiperazine
  • Halobenzene
  • Chlorobenzene
  • Piperazine
  • 1,4-diazinane
  • Aryl halide
  • Aryl chloride
  • Tertiary aliphatic amine
  • Tertiary amine
  • Azacycle
  • Organoheterocyclic compound
  • Monocarboxylic acid or derivatives
  • Ether
  • Dialkyl ether
  • Carboxylic acid
  • Carboxylic acid derivative
  • Hydrocarbon derivative
  • Organooxygen compound
  • Organonitrogen compound
  • Organochloride
  • Organohalogen compound
  • Carbonyl group
  • Amine
  • Aromatic heteromonocyclic compound
Molecular FrameworkAromatic heteromonocyclic compounds
External DescriptorsNot Available
StatusExpected but not Quantified
  • Drug
  • Enzyme cofactor
ApplicationNot Available
Cellular locationsNot Available
Physical Properties
Experimental Properties
Melting Point112.5 °CNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
Water Solubility0.066 mg/mLALOGPS
pKa (Strongest Acidic)3.6ChemAxon
pKa (Strongest Basic)7.79ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count5ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area53.01 Å2ChemAxon
Rotatable Bond Count8ChemAxon
Refractivity106.87 m3·mol-1ChemAxon
Polarizability41.88 Å3ChemAxon
Number of Rings3ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectrum TypeDescriptionSplash Key
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, NegativeNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, NegativeNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, NegativeNot Available
Biological Properties
Cellular LocationsNot Available
Biofluid LocationsNot Available
Tissue Location
  • Brain
  • Skin
PathwaysNot Available
Normal Concentrations
Not Available
Abnormal Concentrations
Not Available
Predicted Concentrations
BiofluidValueOriginal ageOriginal sexOriginal conditionComments
Blood0-3 uMAdult (>18 years old)BothNormalPredicted based on drug qualities
Blood0-1 umol/mmol creatinineAdult (>18 years old)BothNormalPredicted based on drug qualities
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDNot Available
DrugBank Metabolite IDNot Available
Phenol Explorer Compound IDNot Available
Phenol Explorer Metabolite IDNot Available
FoodDB IDFDB023599
KNApSAcK IDNot Available
Chemspider ID2577
KEGG Compound IDC07778
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkCetirizine
NuGOwiki LinkHMDB05032
Metagene LinkHMDB05032
PubChem Compound2678
PDB IDNot Available
ChEBI ID3561
Synthesis ReferenceCossement, Eric; Motte, Genevieve; Bodson, Guy; Gobert, Jean. A., Process for preparation of cetirizine, its dihydrochloride, and optical isomers via hydrolysis and corresponding nitriles. Brit. UK Pat. Appl. (1990), 13 pp.
Material Safety Data Sheet (MSDS)Download (PDF)
General References
  1. Tashiro M, Sakurada Y, Iwabuchi K, Mochizuki H, Kato M, Aoki M, Funaki Y, Itoh M, Iwata R, Wong DF, Yanai K: Central effects of fexofenadine and cetirizine: measurement of psychomotor performance, subjective sleepiness, and brain histamine H1-receptor occupancy using 11C-doxepin positron emission tomography. J Clin Pharmacol. 2004 Aug;44(8):890-900. [15286093 ]
  2. Purohit A, Melac M, Pauli G, Frossard N: Comparative activity of cetirizine and desloratadine on histamine-induced wheal-and-flare responses during 24 hours. Ann Allergy Asthma Immunol. 2004 Jun;92(6):635-40. [15237765 ]
  3. Ramboer I, Bumtbacea R, Lazarescu D, Radu JR: Cetirizine and loratadine: a comparison using the ED50 in skin reactions. J Int Med Res. 2000 Mar-Apr;28(2):69-77. [10898119 ]
  4. Purohit A, Duvernelle C, Melac M, Pauli G, Frossard N: Twenty-four hours of activity of cetirizine and fexofenadine in the skin. Ann Allergy Asthma Immunol. 2001 Apr;86(4):387-92. [11345280 ]
  5. Townley RG, Okada C: Use of cetirizine to investigate non-H1 effects of second-generation antihistamines. Ann Allergy. 1992 Feb;68(2):190-6. [1346737 ]
  6. Brik A, Tashkin DP, Gong H Jr, Dauphinee B, Lee E: Effect of cetirizine, a new histamine H1 antagonist, on airway dynamics and responsiveness to inhaled histamine in mild asthma. J Allergy Clin Immunol. 1987 Jul;80(1):51-6. [2885355 ]
  7. Fadel R, Herpin-Richard N, Rihoux JP, Henocq E: Inhibitory effect of cetirizine 2HCl on eosinophil migration in vivo. Clin Allergy. 1987 Jul;17(4):373-9. [2887304 ]
  8. Petersen LJ, Church MK, Rihoux JP, Skov PS: Measurement of interstitial cetirizine concentrations in human skin: correlation of drug levels with inhibition of histamine-induced skin responses. Allergy. 1999 Jun;54(6):607-11. [10435475 ]
  9. Siergiejko Z, Michalska I, Rogalewska A, Chyrek-Borowska S: [Effect of cetirizine, selective H1 antagonist of histamine on skin and bronchial reactivity and cellular histamine release in allergic diseases] Pneumonol Alergol Pol. 1992;60(11-12):22-7. [1303774 ]
  10. Atkins PC, Zweiman B, Moskovitz A, von Allmen C, Ciliberti M: Cellular inflammatory responses and mediator release during early developing late-phase allergic cutaneous inflammatory responses: effects of cetirizine. J Allergy Clin Immunol. 1997 Jun;99(6 Pt 1):806-11. [9215249 ]
  11. Simons FE, Murray HE, Simons KJ: Quantitation of H1-receptor antagonists in skin and serum. J Allergy Clin Immunol. 1995 Mar;95(3):759-64. [7897161 ]


General function:
Involved in monooxygenase activity
Specific function:
Exhibits low testosterone 6-beta-hydroxylase activity.
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Uniprot ID:
Molecular weight:
General function:
Involved in G-protein coupled receptor protein signaling pathway
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:
Uniprot ID:
Molecular weight: