When plant pollen fills the air, you may find nasal congestion the most bothersome of all your seasonal allergies. AERIUS Double Action 12 Hour combines the AERIUS antihistamine multi-symptom allergy relief with the added benefit of a decongestant. It provides relief from symptoms associated with seasonal allergies with a specific extra action on sinus and nasal congestion for up to 12 hours. With AERIUS Double Action 12 Hour, it's all in one tablet. AERIUS Double Action 12 Hour effectively relieves all of the following allergy symptoms: nasal congestion or stuffiness; sinus pressure; sneezing; runny nose; itchy nose; itchy ears; itchy palate; itchy, burning, watery, red eyes.