Cetirizine Dihydrochloride

Selective H1 Antihistamine agent

Parameters Results
Name Cetirizine DiHCl
Quality BP/EP
IUPAC Name (2-(4-((4-Chlorophenyl)phenylmethyl)-1-piperazinyl) ethoxy)acetic acid dichloride
Molecular Formula C21H23ClN2O3.2HCl
Molecular Weight 461.82 gm/mol
CAS Number 83881-52-1
Physical Appearance A White or almost white Crystalline Powder
Solubility Freely soluble in water, practically insoluble in Acetone and in Methylene Chloride
Appearance of Solution 5% solution is clear and not more intensely colored than reference solution BY7
Identification by IR Absorption The absorption maxima in the spectrum obtained with the sample should correspond in position and relative intensity to those in the spectrum obtained with that of standard.
Identification by HPLC The retention of the major peak in the Chromatogram of the assay preparation corresponds to that in the chromatogram of the standard preparation as obtained in the assay.
Identification by Sulphate Test It responds to the test of Sulphate.
pH (1 gm in 20 ml water) 1.2 to 1.8
Loss on Drying Not more than 0.5% w/w
Sulphated Ash Not more than 0.2% w/w
Relative Impurities
(By HPLC)
Any Individual Impurity
Total Impurity


Not more than 0.1%
Not more than 0.3%
Particle Size 95% should pass through #60 mesh sieve
Assay (on dry basis) 99% to 100.5% w/w as C21H23ClN2O3.2HCl