What is the difference between Allegra and Allegra-D?
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In addition, to the active ingredient in Allegra, Fexofenadine HCL, Allegra D also contains pseudoephedrine HCl. Pseudoephedrine HCl is an orally active sympathomimetic amine and exerts a decongestant action on the nasal mucosa. Pseudoephedrine HCl is recognized as an effective agent for the relief of nasal congestion due to allergic rhinitis.