Fexofenadine, sold under the trade name Allegra among others is an antihistamine pharmaceutical drug used in the treatment of allergy symptoms, . View detailed reports from patients taking allegra who experienced eczema. Reports are from official medical reports as well as online extractions from user reviews . Learn about fexofenadine or fexofenadine hydrochloride. What are the uses of fexofenadine hydrochloride. How does fexofenadine vs loratadine and fexofenadine vs . NHS medicines information on fexofenadine – what it’s used for, side effects, dosage and who can take it. Skip to main content. eczema; hives (urticaria). Physician reviewed fexofenadine patient information - includes fexofenadine description, dosage and directions.. Learn about Allegra (Fexofenadine Hcl) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications..