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.
Investigational Site Number 392-001, Shinjuku-ku, Japan
Lexicon Investigational Site, Dallas, Texas, United States
Clinical Trial Center of Chonbuk National University Hospital, Jeonju, Jeollabuk-do, Korea, Republic of
Medellin, Medellin, Antioquia, Colombia
Bioserve Clinical Research Private Limited, Balanagar, Hyderabad, Andhra Pradesh, India
National Taiwan University (NTUH); NTUH Hsin-Chu Branch; NTUH Yun-Lin Branch; Cathay General hospital, Taipei, Taiwan
Campus Bio-Medico of Rome University, Roma, Italy
University of Berlin Charité, Department of Dermatology and Allergy, Berlin, Germany
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