Antihistamines are a type of medication ... in the body during an allergic reaction that causes itchiness and inflammation. For example, antihistamines like Claritin, Allegra, and Zyrtec are ...
Doctors recommend first trying to limit your exposure to whatever is triggering an allergic response — for ... like Claritin-D and Allegra-D, come combined with pseudoephedrine (Sudafed).