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LevoCetirizine
CAS NO. 130018-77-8
ATC code R06AE09
PubChem 1549000
Chemical data
Formula C21H25ClN2O3
Mol. mass 388.888 g/mol
Pharmacokinetic data
Bioavailability High
Protein binding 90%
Metabolism Hepatic 14% CYP3A4
Half life 6 to 10 hours
Excretion Renal and fecal
Levocetirizine is a third generation non-sedative antihistamine, developed
from the second generation antihistamine cetirizine. Chemically,
levocetirizine is the active enantiomer of cetirizine. It is the L-enantiomer
of the cetirizine racemate. Levocetirizine works by blocking histamine
receptors. It does not prevent the actual release of histamine from mast
cells, but prevents it binding to its receptors. This in turn prevents the
release of other allergy chemicals and increased blood supply to the area,
and provides relief from the typical symptoms of hayfever.
Levocetirizine is used to relieve runny nose; sneezing; and redness,
itching, and tearing of the eyes caused by hay fever, seasonal allergies,
and allergies to other substances such as dust mites, animal dander, and
mold. It is also used to treat symptoms of hives, including itching and
rash. Levocetirizine is in a class of medications called antihistamines. It
works by blocking the action of histamine, a substance in the body that
causes allergic symptoms.
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