Desloratadine

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Abstract
▴ Desloratadine is the orally active major metabolite of the nonsedating H1-antihistamine loratadine. ▴ The drug had no adverse cardiovascular effects in various animal models or when administered at 9 times the recommended adult dosage for 10 days in volunteers. Therapeutic dosages had no effects on wakefulness or psychomotor performance in healthy volunteers. ▴ No clinically significant interactions have been reported between desloratadine and drugs that inhibit the cytochrome P450 system, nor does the drug potentiate the adverse psychomotor effects of alcohol. ▴ Oral desloratadine 5mg once daily for up to 4 weeks in patients with seasonal allergic rhinitis (SAR) significantly reduced nasal (including congestion) and non-nasal symptoms and improved health-related quality of life compared with placebo. Similar beneficial effects were observed in patients with SAR and coexisting asthma (in whom asthma symptoms and use of β2-agonists were reduced). ▴ Desloratadine 5mg once daily for 6 weeks significantly improved pruritus and reduced the number of hives compared with placebo in patients with chronic idiopathic urticaria (CIU). Sleep and daytime performance also improved. ▴ Desloratadine was well tolerated in clinical trials and had an adverse event profile similar to that of placebo in patients with SAR (with or without asthma) or CIU.

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