Rhinitis medicamentosa; Large obstructive nasal polyps; Documented evidence of acute or significant chronic sinusitis, or upper respiratory tract infection as determined by the individual Investigator; Asthma, with the exception of mild intermittent asthma, to lessen confounding by asthma medications; History of hospitalization for asthma; History or presence of acute or subacute atopic dermatitis, chronic dermatitis, urticaria factitia, or urticaria due to physical/chemical influence.