Metered dose inhalers.
D000402:Airway Obstruction / Q000188:drug therapy*; D001249:Asthma / Q000188:drug therapy*; D001993:Bronchodilator Agents / Q000008:administration & dosage*; D004334:Drug Administration Schedule; D006801:Humans; D009330:Nebulizers and Vaporizers
D001993:Bronchodilator Agents