Xyzal tablets contain 5 mg levocetirizine, which corresponds Zyrtec tablets which contain 10 mg cetirizine.
Cetirizine is a second generation antihistamine made up equally of two molecules that are the mirror images of each other, one is levocetirizine the other is dextrocetirizine. It is thought that the levocetirizine has the most active pharmaceutical effect.
Xyzal was developed to contain only the active form of the molecule which levocetirizine.
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