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What is the difference between Xyzal and Zyrtec? What is the Levo?

Responses (1)

Marvell 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.

wvdustbunny 10 Nov 2009

So, in layman's terms, Xyzal is only one part of zyrtec. So, if Xyzal works for me, then zyrtec should also work and zyrtec is over the counter, right? Thank you for your help.

Hottr 6 Aug 2016

Levocetirizine is non drowsy as per other websites is that really true in users experiences?

Hottr 6 Aug 2016

Levocetirizine (as levocetirizine dihydrochloride) is a third-generation non-sedative antihistamine, developed from the second-generation antihistamine Cetirizine

TresID 28 Oct 2016

You say Levocetirizine is non-sedative, so why do the instructions say to take at bedtime? My doctor prescribed 1-2 per day, so I took one during the day and one at bedtime, and I fell asleep driving several times!

My reason for visiting your site was to compare cetirizine and levocetirizine. I have chronic hives (CIU) and have found that mixing antihistamines and taking them throughout the day helps. I am taking loratadine morning and early evening, cetirizine at lunch and levocetirizine at bedtime. Wondering if I should continue to buy cetirizine when I have a prescription for levocetirizine? free discount card

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