Fexofenadine Home>Pharmacy>Drugs_and_Medications>F>Fexofenadine     Web Pages Allegra (Fexofenadine) Relieves allergy symptoms in patients 12 and over. Fexofenadine Information from the RxList. DrugDigest: Allegra Information on dosage, usage, side effects, interactions, and drug comparisons including generics when available. MedlinePlus: Fexofenadine and Pseudoephedrine (Systemic) Patient's guide to this medication also known as Allegra-D provided by the United States Pharmacopeia. MedlinePlus: Fexofenadine (Systemic) Patient's guide to this medication provided by the United States Pharmacopeia.