Zyrtec (cetirizine) and Zyrtec-D (cetirizine and pseudoephedrine) have similar names and uses. However, the key difference between the medications is that, in addition to cetirizine, Zyrtec-D ...

If you are taking the over-the-counter product to self-treat, read all directions on the product package before taking this medication. If you have any questions, consult your pharmacist.