title: Dose-effect relationship of a controlled release theophylline preparation in pre-school children.
mesh_terms: D001249:Asthma / Q000097:blood / Q000188:drug therapy*; D002648:Child; D002675:Child, Preschool; D003692:Delayed-Action Preparations; D004305:Dose-Response Relationship, Drug; D006801:Humans; D012129:Respiratory Function Tests; D013806:Theophylline / Q000008:administration & dosage* / Q000097:blood / Q000627:therapeutic use
chemical_list: D003692:Delayed-Action Preparations; D013806:Theophylline