Safety of Desloratadine in Children With Allergy Sensitivity and Chronic Hives, Who Are Poor Metabolizers of Desloratadine (Study P02994)

Inclusion Criteria: Subjects must: * have been previously identified through the previous study P03031 to be atopic or with chronic idiopathic urticaria and be a poor metabolizer of desloratadine. * have clinical laboratory tests within normal limits. * be in good health, free of any clinically significant disease that could interfere with the study. * normal 12-lead ECG Exclusion Criteria: Subjects who: * have a history of any clinically significant local or systemic infectious disease within 4 weeks prior to treatment. * have taken any medication that is restricted by the protocol or failed to satisfy washout requirements. * are allergic to desloratadine. * have used a loratadine- or desloratadine-containing product within the past 30 days. * are female and menstruating.