Get all-day relief with Allegra® 24 Hour Tablets. Get fast-acting relief from seasonal allergies and symptoms like a runny nose, sneezing, itchy, watery eyes, and itchy nose or throat. Allegra ® kicks in within just one hour with 0% brain interference from drowsiness—that's right, it doesn't enter your brain and leave you feeling groggy. That's why it's the 1 allergist-recommended non. Fexofenadine (Allegra) is an antihistamine that treats and prevents allergy symptoms. It blocks histamine to reduce your symptoms. Allergy relief solutions with fexofenadine antihistamine in tablet and gelcap formats for symptom management. Allegra (Fexofenadine Hcl) may treat allergy, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison. Find patient medical information for Fexofenadine (Allegra) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Detailed dosage guidelines and administration information for Allegra (fexofenadine hydrochloride). Includes dose adjustments, warnings and precautions. Allegra 120mg Tablet is used in the treatment of Urticaria, Allergic rhinitis. Find Allegra 120mg Tablet uses, composition, side-effects, price, substitutes, drug interactions, precautions, warnings, and expert advice. Allegra (fexofenadine) is an antihistamine used to treat allergy symptoms, including sneezing, itching, watery eyes, and a runny nose. Includes Allegra side effects, interactions, and indications. Allegra® provides effective relief from allergy symptoms with 0% brain interference, keeping you alert and non-drowsy. Fexofenadine, sold under the brand name Allegra among others, [10] is an antihistamine medication used in the treatment of allergy symptoms such as allergic rhinitis and urticaria.