A Study of RO4989991 in Patients With Allergic Rhinitis

Inclusion Criteria: * Adult patients, 18-65 years of age, inclusively * A history of allergic rhinitis diagnosed by a physician, but otherwise healthy * A positive skin prick test to at least one standardized allergen at screening * A body mass index (BMI) between 18 and 32 kg/m2, inclusively Exclusion Criteria: * History or presence of any respiratory disease or condition other than allergic rhinitis * Use of prescription medication or herbal remedies within 14 days of dosing the study drug * Use of over-the-counter (OTC) medications within 7 days of dosing the study drug * Acute infection (including viral infections) 6 weeks (8 weeks for respiratory infections) preceding dosing or any ongoing chronic infection * Positive test for human immunodeficiency virus (HIV) or hepatitis B or C