title: Sustained-release theophylline reduces dyspnea in nonreversible obstructive airway disease.
mesh_terms: D003692:Delayed-Action Preparations; D004417:Dyspnea / Q000188:drug therapy*; D006801:Humans; D005082:Physical Exertion; D013806:Theophylline / Q000008:administration & dosage* / Q000627:therapeutic use
chemical_list: D003692:Delayed-Action Preparations; D013806:Theophylline