Study for the Treatment of Intermittent Allergic Rhinitis With Desloratadine (Study P04683)

Inclusion Criteria: The subject must meet ALL of the criteria listed below for entry: * For this study, the diagnosis of IAR is not based solely on the current episode of AR. Subjects must have at least a 2 year history of AR consistent with IAR (defined as symptoms of allergic rhinitis present less than four days per week or for less than four consecutive weeks per year); the current episode can count as the second year. * Subjects must be 12 years of age and older, of either sex and of any race. * At the Run-In Visit, subjects must be sufficiently symptomatic, with a T5SS 12-hour AM-PRIOR (reflective) symptoms severity score of at least 6. * In order for a subject to qualify at the Baseline Visit, the sum of the daily averages of the diary recordings of the 12-hour AM PRIOR + PM-PRIOR (reflective) T5SS collected during Days -4 to -1 and the AM PRIOR T5SS on the morning of the Baseline Visit (Day 1) must be \>= 30. * Subjects must have a positive skin-prick test at screening to one or more allergens in the GA2LEN (or the usually used local) panel of seasonal and perennial allergens. Subjects must demonstrate an antigen-induced skin prick wheal at least 3 mm in diameter greater than diluent control. The positive tests must include the allergen(s) prevalent while this study is active. * Subjects must be free of any clinically significant disease, other than IAR, which would interfere with the study evaluations. * Subjects, or parents/legal guardians, must give written inform…