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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 67 (1989), S. 1058-1060 
    ISSN: 1432-1440
    Keywords: Hyperuricemia ; Irtemazole ; Pharmacokinetics ; Uricosuric agents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A single 50 mg dose of irtemazole was given orally to ten healthy male volunteers. The onset of effects was tested. Plasma uric acid began to decrease 15 to 25 min after irtemazole was administrated. Renal uric acid excretion and uric acid clearance increased 10 to 20 min after drug administration. Maximal renal uric acid excretion (mean 197.4 mg/h) and maximal uric acid clearance (mean 78.4 ml/min) were reached after 15 to 55 min. No side effects were observed. The effects of irtemazole occur earlier than those of benzbromarone. The therapeutic effects of long-term therapy remain to be investigated.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1440
    Keywords: Benzbromarone metabolism ; Slow elimination phenotypes ; Pharmacokinetics ; Metabolites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To determine the elimination phenotype of the uricosuric agent benzbromarone 100 mg of the drug was administered as a single oral dose to 11 volunteers on a formula diet; plasma concentration-time profiles of the parent drug and the main metabolites M1 (1′-hydroxybenzbromarone) and M2 (6-hydroxy-benzbromarone) were measured by high-performance liquid chromatography for 168 h. Of the 11 subjects 2 showed higher plasma concentrations and delayed elimination of benzbromarone and metabolite M1 but reduced formation of metabolite M2 compared to the other 9 subjects. However, the plasma concentration-time profiles of the metabolites in these two slow eliminators, termed type 2, differed from those of a poor eliminator characterized during a previous study; the latter, termed type 1, eliminated benzbromarone as well as both metabolites M1 and M2 slowly. The differences in the elimination of benzbromarone and its metabolites are probably caused by differences in the activities of the cytochrome P450 mono-oxygenase isozymes. The results show that determination of the phenotype solely by measurement of the 24-h benzbromarone plasma concentration does not unequivocally characterize slow benzbromarone eliminators; additional plasma concentration-time profiles of the parent drug and metabolites are necessary. Metabolite M2 is characterized as 6-hydroxybenzbromarone; the formation and elimination of the chiral metabolite M1 is enantioselective.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 158 (1972), S. 89-94 
    ISSN: 1433-8580
    Keywords: Heparin ; Pharmacokinetics ; Metabolism ; Therapy with heparin ; Heparin ; Pharmakokinetik ; Stoffwechsel ; Therapie mit Heparin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Verteilungsraum, Clearance und Halbwertszeit von Heparin wurden aus dem Verlauf der Plasmaheparinkonzentration (metachromatische Bestimmung nach Fällung) nach intravenöser Injektion bestimmt. Der Verteilungsraum des Heparins ist etwas größer als das Plasmavolumen. Die Elimination von Heparin aus dem Plasmaraum geschieht durch mindestens zwei Mechanismen mit unterschiedlicher Clearance. Auf die anfänglich rasche Clearance folgt nach etwa 30 min eine spätere Phase mit einer etwa 10fach geringeren Clearance.
    Notes: Summary Volume of distribution, clearance and plasma half-life of heparin were determined by metachromatic measurement of heparin precipitated from plasma after i.v. administration. The volume of distribution was slightly larger than the plasma volume. Heparin is eliminated from the plasma by two processes with different clearance rates; the first rate is 10 fold larger than the second.
    Type of Medium: Electronic Resource
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