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Medically reviewed by Daniel More, MD Common side effects of Zyrtec (cetirizine) can include drowsiness, fatigue, dry mouth, ...
The active ingredient in Xyzal (levocetirizine) is a form of cetirizine (the active ingredient in Zyrtec). Xyzal offers several advantages for people dealing with allergies: It provides fast ...
Claritin-D, Allegra-D, and Zyrtec-D all contain a decongestant called pseudoephedrine, the same active ingredient that powers Sudafed. It makes your nose feel less stopped up by narrowing the ...