Fexofenadine is an over-the-counter second-generation antihistamine used in the treatment of various allergic symptoms. It is selective for the H receptor, carries little-to-no activity at off-targets, and does not cross the blood-brain barrier - this is in contrast to previous first-generation antihistamines, such as diphenhydramine, which readily bind to off-targets that contribute to side effects such as sedation. Fexofenadine is the major active metabolite of terfenadine and is administered as a racemic mixture in which both enantiomers display approximately equivalent antihistamine activity.
In the United States, fexofenadine is indicated for the symptomatic treatment of allergic rhinitis in patients ≥2 years old and chronic idiopathic urticaria in patients ≥6 months old. In Canada, fexofenadine carries the same indications but is approved only for patients ≥12 years old. Fexofenadine is also available in combination with pseudoephedrine for the symptomatic treatment of season allergic rhinitis in patients ≥12 years old.
Beni-Suef Hospital, Banī Suwayf, Egypt
Faculty of Medicine - Beni Suef Hospital, Banī Suwayf, Egypt
FoxHall Dermatology- Site Number : 8400042, Washington, District of Columbia, United States
Optima Research - Boardman- Site Number : 8400039, Boardman, Ohio, United States
Investigational Site Number : 3920004, Habikino, Japan
Clinica de Alergia Martti Antila, Sorocaba, SP, Brazil
Eurofarma Laboratórios S.A, São Paulo, Brazil
Columbia University Irving Medical Center/NYP, New York, New York, United States
Department of Neurology, Herlev Hospital, Herlev, Denmark
Department of Neurology, Aalborg University Hospital, Aalborg, Denmark
Department of Neurology, Aarhus University Hospital, Aarhus, Denmark
Ucsf Ctsi Crc, San Francisco, California, United States
Department of Movement and Sports Sciences, Ghent University, Gent, Oost-Vlaanderen, Belgium
Faculty of Pharmacy, Tanta University, Tanta, Egypt
Arizona Arthritis and Rheumatology Research, PLLC-East, Mesa, Arizona, United States
Axis Clinical Trials, Los Angeles, California, United States
Prohealth Research Center, Doral, Florida, United States
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