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  • Key words Acetaminophen  (1)
  • skin metabolism  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 50 (1996), S. 69-76 
    ISSN: 1432-1041
    Keywords: Key words Acetaminophen ; Liver disease in children ; toxicity ; analgesics ; antipyretics pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: To study the metabolism of single doses of paracetamol in paediatric patients with chronic liver disease admitted to a hospital liver disease clinic. Results: Thirteen paediatric patients, aged 7 months to 12 years, with chronic liver disease of varying severity were studied. In these children, paracetamol elimination half-life was negatively correlated with serum albumin and positively with prothrombin time, as previously reported in adults with liver disease. The rate constant of glucuronide formation was higher in the children with liver disease compared to the value reported in healthy children of similar ages. The rate constant of the formation of paracetamol sulphate was no different from that in normal children. The 36 h urinary paracetamol glucuronide to sulphate ratio was 1.4 (95% CI 0.8 to 1.7). This mean ratio was higher than in healthy children (0.81 and 0.75) but not significantly so, probably because of a Type 1 error due to the inevitable small sample size arising from the nature of the population being studied. Conclusion: The present study provides reassuring additional data to indicate that, at least for single doses, there is no cause for concern in the use of paracetamol in children with chronic liver disease.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 9 (1997), S. 313-316 
    ISSN: 0899-0042
    Keywords: ibuprofen ; topical administration ; chromatography ; skin metabolism ; percutaneous penetration ; chiral ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In vitro experiments to investigate possible stereoselective aspects of the topical administration of ibuprofen have been conducted. Incubation of ibuprofen with rat skin homogenates in the presence of coenzyme A, ATP, and magnesium provided no evidence for the formation of ibuprofenyl coenzyme A (the initial intermediate in the metabolic inversion of [R]- to [S]-ibuprofen). Similar incubation studies gave no indication of a change in the enantiomeric ratios of ibuprofen over the time course of the experiments. Percutaneous penetration studies of ibuprofen gel through porcine skin indicated that the ibuprofen enantiomer levels in the reservoir solutions were consistent with racemic ibuprofen having traversed the skin with no metabolic inversion. These results suggest that, in the models studied, skin metabolism does not result in the chiral inversion of (R)- to (S)-ibuprofen and that the topical administration of ibuprofen will result in the delivery of 50% “isomeric ballast.” Chirality 9:313-316, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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