Fexofenadine HCl 180mg, pseudoephedrine HCl 240mg; ext-rel tabs. See Contraindications. Avoid concomitant aluminum- or magnesium-containing antacids. Pseudoephedrine: Antagonizes antihypertensives.

Getty Images Some antihistamines, like Claritin-D and Allegra-D, come combined with pseudoephedrine (Sudafed). Doctors don’t recommend products that contain pseudoephedrine for children at all ...

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 ...