The active ingredient in Claritin is Loratadine. It works by blocking the natural histamine reaction in dogs’ bodies. As with ...

be sure to double check the type of Claritin you have, as well as the drug facts label for ingredients. "There is no drug ...

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 ...