Desloratadine With Oxybutynin for the Treatment of Seasonal Allergic Rhinitis and Post-Nasal Drip (Study P04258)(COMPLETED)

Inclusion Criteria: Subjects must: * be \>=18 years of age, * be free of any clinically significant disease that would interfere with study, other than seasonal allergic rhinitis (SAR), * have a documented diagnosis of SAR for \>=2 years, * have had a positive skin-prick test, * be sufficiently symptomatic at the Screening visit, * for the 3 calendar days immediately prior to baseline visit, plus the AM of the baseline visit, the seven twice-daily run-in diary PRIOR total nasal symptom scores must have totaled \>=42, the Total Non-Nasal Symptoms score must have totaled \>=28, and the total Post Nasal Drip score must have totaled \>=14, * be in general good health. Exclusion Criteria: Subjects who have: * certain medical conditions or medical histories, * allergies to any of the components in any of the study medications, * nasal structure abnormalities, * dependency to nasal, oral, or ocular decongestants, nasal topical antihistamines, or nasal steroids, * used any investigational drug use in past 30 days, * received immunotherapy (desensitization) * are pregnant