Which side of Zyrtec- d is certrazine?

Zyrtec-D contains two active ingredients: cetirizine and pseudoephedrine. Cetirizine is the antihistamine component that helps relieve allergy symptoms, while pseudoephedrine is a decongestant. Therefore, cetirizine is one of the two sides of Zyrtec-D, specifically the one that addresses allergy symptoms.