Allergic Reactions Management

Introduction to Fexofenadine

The Joint Task Force on Practice Parameters recommends fexofenadine, loratadine, and desloratadine as non-sedating options at recommended doses, while cetirizine and intranasal azelastine may cause sedation 1
Fexofenadine is as effective as loratadine and cetirizine in reducing overall symptoms of seasonal allergic rhinitis, with a lower incidence of drowsiness or fatigue compared to cetirizine 1

For mild allergic reactions, fexofenadine is recommended as a first-line H1 antihistamine due to its non-sedating properties, with consideration of adding an H2 antihistamine for enhanced efficacy 1, 2, 3, 4
In cases of severe allergic reactions or anaphylaxis, epinephrine is the first-line treatment, and fexofenadine should only be used as adjunctive therapy after epinephrine administration 3, 4
For ongoing management after an acute reaction, fexofenadine should be continued at recommended doses for 2-3 days 3, 4

Elderly patients should preferentially receive second-generation antihistamines like fexofenadine over first-generation antihistamines due to the reduced risk of cognitive impairment 1
Fexofenadine works better as prophylactic than acute treatment for allergic symptoms, and its effectiveness is supported by clinical trials 2