title: The influence of diuretics on the excretion and metabolism of doping agents: Part VI. Pseudoephedrine.
abstract: A capillary gas chromatographic method with nitrogen specific detection is presented for measuring pseudoephedrine and its major metabolite norpseudoephedrine in urine after derivatization with trifluoroacetic anhydride. After the oral intake of 49.2 mg pseudoephedrine (ACTIFED) the active substance is nearly quantitatively excreted in urine over a 48 hr period. From 1 to 7 percent is metabolized to norpseudoephedrine. The intake of acetazolamide results in a suppression of the pseudoephedrine concentration for at least 12 h. The diuretic effect after the intake of 1.51 mineral water could be compared with the effect obtained with 1 mg bumetanide and results in a decrease in pseudoephedrine concentration by a factor 4 for several hours.
authors.affiliation: Laboratorium voor Farmacologie en Toxicologie der Huisdieren, Faculteit Diergeneeskunde, Rijksuniversiteit Gent, Belgium.
authors.forename: F T
authors.initials: FT
authors.lastname: Delbeke
authors.forename: M
authors.initials: M
authors.lastname: Debackere
mesh_terms: D000086:Acetazolamide / Q000494:pharmacology; D002034:Bumetanide / Q000494:pharmacology; D002849:Chromatography, Gas / Q000379:methods; D004232:Diuretics / Q000494:pharmacology*; D004809:Ephedrine / Q000378:metabolism / Q000493:pharmacokinetics* / Q000652:urine; D005466:Fluorocarbons; D006801:Humans; D014867:Water / Q000008:administration & dosage / Q000494:pharmacology
chemical_list: D004232:Diuretics; D005466:Fluorocarbons; D014867:Water; D002034:Bumetanide; C033094:perfluorobutyric acid; D004809:Ephedrine; D000086:Acetazolamide