title: Enhanced theophylline metabolism in patients with bronchial asthma at age 4 and under.
abstract: The plasma levels of theophylline (TP) and its metabolites were measured in patients with bronchial asthma who were treated with a slow-release preparation of TP. The ratios of the plasma levels of these metabolites to TP levels in the group aged 1-4 years were larger than those in the group aged 5 years and older, suggesting enhanced activity of drug-metabolizing enzymes during infancy.
authors.affiliation: Department of Pharmacy, Branch Hospital, Faculty of Medicine, University of Tokyo, 3-28-6 Mejirodai, Bunkyo-ku, Tokyo 112-8688, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Kizu
authors.forename: M
authors.initials: M
authors.lastname: Arakawa
authors.forename: Y
authors.initials: Y
authors.lastname: Arakawa
authors.forename: F
authors.initials: F
authors.lastname: Komoda
authors.forename: M
authors.initials: M
authors.lastname: Takamizawa
authors.forename: T
authors.initials: T
authors.lastname: Iwata
authors.forename: T
authors.initials: T
authors.lastname: Hayakawa
authors.forename: K
authors.initials: K
authors.lastname: Imai
mesh_terms: D000293:Adolescent; D000328:Adult; D001249:Asthma / Q000188:drug therapy / Q000378:metabolism*; D001993:Bronchodilator Agents / Q000097:blood / Q000378:metabolism* / Q000493:pharmacokinetics / Q000627:therapeutic use; D002648:Child; D002675:Child, Preschool; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D007223:Infant; D008875:Middle Aged; D013806:Theophylline / Q000097:blood / Q000378:metabolism* / Q000493:pharmacokinetics / Q000627:therapeutic use
chemical_list: D001993:Bronchodilator Agents; D013806:Theophylline