9 Nov 2009
Xyzal (levocetirizine) is the R-enantiomer of cetirizine, and is thus as such not a new compound, but part of an already known preparation. Cetirizine consists of equal parts R- and S-enantiomer, but several studies have shown that the pharmacological effect – a selective inhibitory effect on the peripheral H1 receptors – is induced by the R-enantiomer alone.
Xyzal tablets contain 5 mg levocetirizine, which corresponds to the content of active R-enantiomer in one 10 mg cetirizine tablet.
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Is xyzal different enough from zyrtec to make a difference, or will his system be too used to the active ingredient?
1 answer • 1 May 2010
While taking Xyzal long term I gained 10 to 15 pounds. After cutting back to taking it only when needed I lost 10 pounds. Everytime I take Xyzal 2 ...
4 answers • 30 Sep 2010
I have used samples of Xyzal and it works. Anything i eat may trigger it. I can eat it one time and nothing happens, then the next time it will. I ...
5 answers • 2 Jun 2011