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SHEET /m/cetirizine · PubChem CID 2678 · CAS 83881-51-0 · REV 2026.07

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Cetirizine

from source

C21H25ClN2O3 · 388.9 g/mol

Cetiderm · Cetryn · Hitrizin Film Tablet · Reactine

Also sold as Zyrtec from source

What is Cetirizine?

The non-drowsy allergy antihistamine sold as Zyrtec, taken for hay fever and hives. Cetirizine (C21H25ClN2O3, 389 g/mol) is an over-the-counter medicine sold over the counter. from source

CategoryOTC medicine
Chemical familyCarboxylic AcidsAromaticsEthersHalogenated
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Fig. 1 · 2D structure RDKit

SMILESC1CN(CCN1CCOCC(=O)O)C(C2=CC=CC=C2)C3=CC=C(C=C3)Cl

Where you'll find it

Sold over the counter, without a prescription. Sold as Zyrtec. See the rest of the otc medicine group.

Toxicity & hazards

WarningIrritantH302from source

Keep roaming

Where Cetirizine leads

Relatedcomputed
Levocetirizine100% similarBoth carry a carboxylic acid and an ether group.Hydroxyzine74% similarBoth carry an ether group.Meclizine48% similarBoth carry an aromatic ring and a halogen atom.Cyclizine41% similarBoth carry an aromatic ring.

Compare with

Cetirizine vs DiphenhydramineCetirizine vs LoratadineCetirizine vs Levocetirizine

Sources & methodology

PubChem CID
2678
Wikidata
Q423075
Structure
PubChem → RDKit
Similar molecules
MoleculeFinder fingerprint similarity
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