The best way to prevent and treat respiratory allergies is to avoid the allergen that causes your reaction. However, in many cases with respiratory allergies, that's not really possible since common allergens are abundant in the air you breathe. For people with respiratory allergies, certain medications-which can include prescriptions or over-the-counter medications-may help control and manage symptoms. In some cases, your doctor may also suggest immunotherapy, a treatment that involves weekly shots that decrease the severity of your allergies over time. Talk to your doctor to discuss possible treatment options.