- Use of the following therapies for the periods specified prior to the screening visit will make the subject ineligible for the study: corticosteroids: (depot: 90 days; systemic: 30 days; dermatological, intranasal, inhalational: 15 days); cromones (14 days); antihistamines other than loratadine (nasal and long-acting oral: 10 days; short-acting oral, ocular: 7 days); leukotriene inhibitors (10 days); anticholinergics (7 days); alpha-adrenergic agonists (7 days); tricyclic antidepressants (14 days). If it becomes a medical necessity for a subject to use one of these contraindicated medications during the study this will become an individual stopping criteria.