This perennial allergic rhinitis study is for patients who are allergic to housedust mite OR will be exposed to at least one of the other perennial allergens for the duration of the study.  You will be skin tested for housedust mites, cat, dog, horse, cockroach, and 4 molds.  You must be 19 years old or older with at least a 2 year history of perennial allergy.  Patients with stable asthma are also allowed to participate.  Study medication and other meds will be supplied.  Compensation for time and travel will be provided along with compensation for diary compliance.