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 ...