The best way to treat asthma is to avoid the allergens or triggers that bring on an asthma attack. See our allergy solution guides to learn how to avoid the following allergens: Dust Mites, Mold, Pollen, and Pet Dander.However, allergen avoidance is not always possible. Drug therapy consists of anti-inflammatory drugs to reduce inflammation and swelling and bronchodilators to open up constricted airways. Metered-dose inhalers are the most common asthma drug delivery system. Dry powder inhalers are available for small children, but not all asthma medicines are available in dry powder form. Young children also often use a nebulizer, which allows the asthma sufferer to inhale the medicine using a mouthpiece or facemask.