Anti-histamines combined with a decongestant are usually marked with a "D." Claritin-D, Allegra-D, and Zyrtec-D all contain a decongestant called pseudoephedrine, the same active ingredient that ...
Antihistamines — like Claritin, Allegra, or Zyrtec — can reduce most of these ... allergic rhinitis using sedating antihistamines when compared to children treated with non-sedating ...
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