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A: Zyrtec-D is a combination tablet of an antihistamine (Zyrtec) and a decongestant (pseudoephedrine). Antihistamines help with sneezing, runny noses and drainage. Decongestants help relieve pressure and pain in the sinuses. Zyrtec or the antihistamine portion has a potential to cause some drowsiness and dry mouth. Sudafed (pseudoephedrine) can cause difficulty sleeping, nausea, and loss of appetite.
Histamine is the chemical responsible for allergy symptoms such as sneezing, watery nose, itching nose and throat etc. This medicine is also used to treat skin hives. Claritin should not be taken if one is either allergic to the medicine or has a history of kidney disease or liver disease. Zyrtec is more frequently prescribed or purchased than Claritin. â¢ Among the forms of the drug, Zyrtec has an additional form of eye drop medicine which Claritin does not have. Related posts: 1  Difference Between Claritin and Claritin D.