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Systematic (IUPAC) name
piperazin-1-yl]ethoxy]acetic acid
CAS number 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
Therapeutic considerations
Pregnancy cat.


Legal status


Routes Oral

  Levocetirizine (as levocetirizine dihydrochloride) is a third generation non-sedative antihistamine, developed from the second generation antihistamine cetirizine. Chemically, levocetirizine is the active enantiomer of cetirizine. 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.

It is claimed to be more effective and with fewer side effects than the second generation drugs.[citation needed]


History & formulations

Levocetirizine was first launched in 2001 by Belgian pharmaceutical company UCB with the brand name Xyzal; in the UK, Ireland, Austria, France and The Netherlands Xuzal; in Mexico, and Xusal or Xozal elsewhere in Europe. In India, levocetirizine is marketed by GlaxoSmithKline under the brand name Vozet. Last May 2007, the United States Food and Drug Administration has approved Xyzal, where it is co-marketed by Sanofi-Aventis.

It is available as 5mg strength tablets.

Side Effects

Levocetirizine is called a non-sedating antihistamine as it does not enter the brain in significant amounts, and is therefore unlikely to cause drowsiness. However, some people may experience some slight sleepiness or fatigue. It should be used with caution when working with machines. You should also make sure you know how this medicine affects you before you perform potentially hazardous activities.


Latest research shows levocetirizine reduces asthma attacks by 70% in children.[1]


Although the drug was only authorized by the US FDA on 25 May 2007 U.S., it is already available in most European countries. Based on previous pricing patterns for new drugs, it will likely enter the market at a higher price than currently available third and second generation antihistamines.


  1. ^ levocetirizine prevents asthma
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Levocetirizine". A list of authors is available in Wikipedia.
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