Chemical: Drug
desloratadine

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Annotated Labels

  1. Annotation of FDA Label for desloratadine
  2. Annotation of EMA Label for desloratadine

last updated 10/25/2013

1. Annotation of FDA Label for desloratadine

Summary

Desloratadine and psuedoephidrine is used to treat nasal congestion and other symptoms of seasonal allergic rhinitis. The label does not specify any protein or gene names associated with variation in metabolism. This drug-biomarker pair was previously in the FDA's "Table of Pharmacogenomic Biomarkers in Drug Labels" but has subsequently been removed.

Annotation

The FDA-approved drug label for desloratadine and psuedoephedrine (Clarinex-D) highlighted information regarding variation in the metabolism of desloratadine. This drug-biomarker pair was previously in the FDA's "Table of Pharmacogenomic Biomarkers in Drug Labels" but has subsequently been removed.

The label mentioned that "poor metabolizers" had a decreased ability to form 3-hydroxydesloratadine and a 6-fold greater median exposure (AUC) to desloratadine. Though no overall differences in safety were observed between poor metabolizers and normal metabolizers, the label noted that an increased risk of exposure-related adverse events in poor metabolizers cannot be ruled out. However, the label did not specify any protein or gene names associated with the variation in metabolism efficacy, therefore it is unclear from the label which enzyme has these "poor metabolizers" of desloratidine.

For the complete drug label text with sections containing pharmacogenetic information highlighted, see the desloratadine and pseudoephedrine drug label.

*Disclaimer: The contents of this page have not been endorsed by the FDA and are the sole responsibility of PharmGKB.

Full label available at DailyMed

Genes and/or phenotypes found in this label


last updated 10/25/2013

2. Annotation of EMA Label for desloratadine

Informative PGx

Summary

The EMA European Public Assessment Report (EPAR) highlights information regarding variation in the metabolism of desloratadine in different individuals, but does not mention pharmacogenetics or genetic testing. The genes/ enzymes involved are not known.

Annotation

Excerpt from the Desloratadine and Pseudoephedrine (Aerinaze) EPAR:

"In a series of pharmacokinetic and clinical trials, 6 % of the subjects reached a higher concentration of desloratadine. The prevalence of this poor metabolizer phenotype was greater among Blacks adults than Caucasians adults (18 % vs. 2 %) however the safety profile of these subjects was not different from that of the general population. In a multiple-dose pharmacokinetic study conducted with the tablet formulation in healthy adult subjects, four subjects were found to be poor metabolisers of desloratadine. These subjects had a Cmax concentration about 3-fold higher at approximately 7 hours with a terminal phase half-life of approximately 89 hours."

This information is highlighted in the following sections:

Pharmacokinetic properties.

For the complete drug label text with sections containing pharmacogenetic information highlighted, see the Desloratadine and Pseudoephedrine EMA drug label.

*Disclaimer: The contents of this page have not been endorsed by the EMA and are the sole responsibility of PharmGKB.


PharmGKB contains no Clinical Variants that meet the highest level of criteria.

To see more Clinical Variants with lower levels of criteria, click the button at the bottom of the page.

Disclaimer: The PharmGKB's clinical annotations reflect expert consensus based on clinical evidence and peer-reviewed literature available at the time they are written and are intended only to assist clinicians in decision-making and to identify questions for further research. New evidence may have emerged since the time an annotation was submitted to the PharmGKB. The annotations are limited in scope and are not applicable to interventions or diseases that are not specifically identified.

The annotations do not account for individual variations among patients, and cannot be considered inclusive of all proper methods of care or exclusive of other treatments. It remains the responsibility of the health-care provider to determine the best course of treatment for a patient. Adherence to any guideline is voluntary, with the ultimate determination regarding its application to be made solely by the clinician and the patient. PharmGKB assumes no responsibility for any injury or damage to persons or property arising out of or related to any use of the PharmGKB clinical annotations, or for any errors or omissions.

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The table below contains information about pharmacogenomic variants on PharmGKB. Please follow the link in the "Variant" column for more information about a particular variant. Each link in the "Variant" column leads to the corresponding PharmGKB Variant Page. The Variant Page contains summary data, including PharmGKB manually curated information about variant-drug pairs based on individual PubMed publications. The PMIDs for these PubMed publications can be found on the Variant Page.

The tags in the first column of the table indicate what type of information can be found on the corresponding Variant Page.

Links in the "Gene" column lead to PharmGKB Gene Pages.

List of all variant annotations for desloratadine

Gene ? Variant?
(147)
Alternate Names ? Chemicals ? Alleles ?
(+ chr strand)
Function ? Amino Acid?
Translation
No VIP available No Clinical Annotations available VA
rs10908703 NC_000001.10:g.159252002G>A, NC_000001.11:g.159282212G>A, NM_002001.3:c.-1782G>A, rs59154953
G > A
SNP
No VIP available CA VA
rs2298805 NC_000001.10:g.159273943G>A, NC_000001.11:g.159304153G>A, NM_002001.3:c.302G>A, NP_001992.1:p.Ser101Asn, XM_005244956.1:c.311G>A, XP_005245013.1:p.Ser104Asn, rs52799204, rs56423676
G > A
SNP
S101N
No VIP available No Clinical Annotations available VA
rs2494262 NC_000001.10:g.159253672C>A, NC_000001.11:g.159283882C>A, NM_002001.3:c.-112C>A, rs17673238, rs59461022
C > A
SNP
Alleles, Functions, and Amino Acid Translations are all sourced from dbSNP 147

Overview

Generic Names
  • Descarboethoxyloratadine
  • Descarboethoxyoratidine
  • Desloratidine
  • desloratadine
Trade Names
  • Aerius
  • Claramax
  • Clarinex
  • Clarinex Reditabs
  • NeoClarityn
Brand Mixture Names
  • Clarinex-D 12 Hour Extended Release Tablets (desloratadine + pseudoephedrine)
  • Desloratadine and Pseudoephedrine (Aerinaze)

PharmGKB Accession Id

PA164776964

Type(s):

Drug

Description

Desloratadine is a second generation, tricyclic antihistamine that which has a selective and peripheral H1-antagonist action. It is the active descarboethoxy metabolite of loratidine (a second generation histamine). Desloratidine has a long-lasting effect and does not cause drowsiness because it does not readily enter the central nervous system.

Source: Drug Bank

Indication

For the relief of symptoms of seasonal allergic rhinitis, perennial (non-seasonal) allergic rhinitis. Desloratidine is also used for the sympomatic treatment of pruritus and urticaria (hives) associated with chronic idiopathic urticaria.

Source: Drug Bank

Other Vocabularies

Information pulled from DrugBank has not been reviewed by PharmGKB.

Pharmacology, Interactions, and Contraindications

Mechanism of Action

Like other H1-blockers, Desloratadine competes with free histamine for binding at H ~1~-receptors in the GI tract, uterus, large blood vessels, and bronchial smooth muscle. This blocks the action of endogenous histamine, which subsequently leads to temporary relief of the negative symptoms (eg. nasal congestion, watery eyes) brought on by histamine.

Source: Drug Bank

Pharmacology

Desloratadine is a long-acting second-generation H ~1~-receptor antagonist which has a selective and peripheral H1-antagonist action. Histamine is a chemical that causes many of the signs that are part of allergic reactions, such as the swelling of tissues. Histamine is released from histamine-storing cells (mast cells) and attaches to other cells that have receptors for histamine. The attachment of the histamine to the receptors causes the cell to be "activated," releasing other chemicals which produce the effects that we associate with allergies. Desloratadine blocks one type of receptor for histamine (the H1 receptor) and thus prevents activation of cells by histamine. Unlike most other antihistamines, Desloratadine does not enter the brain from the blood and, therefore, does not cause drowsiness.

Source: Drug Bank

Food Interaction

Take without regard to meals.

Source: Drug Bank

Absorption, Distribution, Metabolism, Elimination & Toxicity

Protein Binding

82-87%

Source: Drug Bank

Half-Life

50 hours

Source: Drug Bank

Route of Elimination

Desloratadine (a major metabolite of loratadine) is extensively metabolized to 3-hydroxydesloratadine, an active metabolite, which is subsequently glucuronidated. Approximately 87% of a 14C-desloratadine dose was equally recovered in urine and feces.

Source: Drug Bank

Chemical Properties

Chemical Formula

C19H19ClN2

Source: Drug Bank

Isomeric SMILES

C1C2=C(N=CC=C2)/C(=C/3\CCNCC3)/C4=C(C1)C=C(C=C4)Cl

Source: Drug Bank

ClC1=CC2=C(C=C1)C(=C1CCNCC1)C1=NC=CC=C1CC2

Source: Drug Bank

Canonical SMILES

ClC1=CC2=C(C=C1)C(=C1CCNCC1)C1=C(CC2)C=CC=N1

Source: Drug Bank

Average Molecular Weight

310.821

Source: Drug Bank

Monoisotopic Molecular Weight

310.123676325

Source: Drug Bank

SMILES

ClC1=CC2=C(C=C1)C(=C1CCNCC1)C1=C(CC2)C=CC=N1

Source: Drug Bank

InChI String

InChI=1S/C19H19ClN2/c20-16-5-6-17-15(12-16)4-3-14-2-1-9-22-19(14)18(17)13-7-10-21-11-8-13/h1-2,5-6,9,12,21H,3-4,7-8,10-11H2

Source: Drug Bank

Genes that are associated with this drug in PharmGKB's database based on (1) variant annotations, (2) literature review, (3) pathways or (4) information automatically retrieved from DrugBank, depending on the "evidence" and "source" listed below.

Curated Information ?

EvidenceGene
No Dosing Guideline available No Drug Label available CA VA No VIP available No VIP available
FCER1A

Drug Targets

Gene Description
HRH1 (source: Drug Bank )

Drug Interactions

Interaction Description
tacrine - desloratadine The therapeutic effects of the central acetylcholinesterase inhibitor, Tacrine, and/or the anticholinergic, Desloratadine, may be reduced due to antagonism. The interaction may be beneficial when the anticholinergic action is a side effect. Monitor for decreased efficacy of both agents. (source: Drug Bank )
triprolidine - desloratadine Triprolidine and Desloratadine, two anticholinergics, may cause additive anticholinergic effects and enhance their adverse/toxic effects. Additive CNS depressant effects may also occur. Monitor for enhanced anticholinergic and CNS depressant effects. (source: Drug Bank )
triprolidine - desloratadine Triprolidine and Desloratadine, two anticholinergics, may cause additive anticholinergic effects and enhance their adverse/toxic effects. Additive CNS depressant effects may also occur. Monitor for enhanced anticholinergic and CNS depressant effects. (source: Drug Bank )
trospium - desloratadine Trospium and Desloratadine, two anticholinergics, may cause additive anticholinergic effects and enhanced adverse/toxic effects. Monitor for enhanced anticholinergic effects. (source: Drug Bank )

Curated Information ?

Relationships from National Drug File - Reference Terminology (NDF-RT)

May Treat
Contraindicated With

Publications related to desloratadine: 2

No Dosing Guideline available No Drug Label available CA VA No VIP available No VIP available
Association of FCER1A genetic polymorphisms with risk for chronic spontaneous urticaria and efficacy of nonsedating H1-antihistamines in Chinese patients. Archives of dermatological research. 2015. Guo Aiyuan, et al. PubMed
No Dosing Guideline available No Drug Label available No Clinical Annotation available No Variant Annotation available No VIP available No VIP available
Metabolism of loratadine and further characterization of its in vitro metabolites. Drug metabolism letters. 2009. Ghosal Anima, et al. PubMed

LinkOuts

Web Resource:
Wikipedia
National Drug Code Directory:
0085-1264-01
DrugBank:
DB00967
ChEBI:
291342
PubChem Compound:
124087
PubChem Substance:
46507996
700854
Drugs Product Database (DPD):
2243919
BindingDB:
50073179
ChemSpider:
110575
Therapeutic Targets Database:
DAP000331
FDA Drug Label at DailyMed:
5b79aff4-9bed-429d-8def-a7929293387d

Clinical Trials

These are trials that mention desloratadine and are related to either pharmacogenetics or pharmacogenomics.

No trials loaded.

NURSA Datasets

provided by nursa.org

No NURSA datasets available.

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Sources for PharmGKB drug information: DrugBank, PubChem.