Abstract
Second-generation histamine H1 receptor antagonists were developed to provide efficacious treatment of allergic rhinitis (AR) and chronic idiopathic urticaria (CIU) while decreasing adverse effects associated with first-generation agents. When comparing the efficacy and safety profiles of the newest second-generation antihistamines — desloratadine, fexofenadine and levocetirizine — many pharmacological and clinical criteria must be considered. Most importantly, these elements should not be evaluated separately but, rather, as parts of a puzzle that create a whole picture. As a class, second-generation antihistamines are highly selective for the H1 receptor. Some bind to it with high affinity, although there is marked heterogeneity among the various compounds. They have a limited effect on the CNS, and clinical studies have noted almost no significant drugdrug interactions in the agents studied. No major cytochrome P450 inhibition has been reported with desloratadine, fexofenadine and levocetirizine, and the bioavailability of desloratadine is minimally affected by drugs interfering with transporter molecules. Of the second-generation antihistamines, desloratadine has the greatest binding affinity for the H1 receptor. The use of desloratadine, fexofenadine and levocetirizine is not associated with clinically relevant antimuscarinic effects. Desloratadine and fexofenadine do not impair cognitive or psychomotor functioning and are comparable with placebo in terms of somnolence. Based on these pharmacological characteristics, as well as clinical endpoints such as symptom scores, quality-of-life surveys, inflammatory cell counts and investigators’ global evaluations, we conclude that desloratadine, fexofenadine and levocetirizine are all efficacious treatments for AR and CIU. However, differences among the antihistamines in relation to a lack of significant interaction with drug transporter molecules and somnolence in excess of placebo may provide some advantages for the overall profile of desloratadine compared with fexofenadine and levocetirizine.
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Notes
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Acknowledgements
The authors have received no funds for their involvement in this work. Over the last 3 years, Dr Devillier has received fees as a consultant or speaker for Altana Pharma AG, AstraZeneca Pharmaceuticals LP, Bioproject Pharma, Boehringer Ingelheim GmbH, Chiesi SA France, GlaxoSmithKline, Merck Sharp & Dohme Ltd, Sanofi-Aventis and Schering-Plough Corporation. Dr Roche has received fees as a consultant or speaker for Altana Pharma AG, AstraZeneca Pharmaceuticals LP, Boehringer Ingelheim GmbH, Chiesi SA France and GlaxoSmithKline. The authors have no conflicts of interest that are directly relevant to the content of this review.
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Devillier, P., Roche, N. & Faisy, C. Clinical Pharmacokinetics and Pharmacodynamics of Desloratadine, Fexofenadine and Levocetirizine. Clin Pharmacokinet 47, 217–230 (2008). https://doi.org/10.2165/00003088-200847040-00001
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DOI: https://doi.org/10.2165/00003088-200847040-00001