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Pharmaceutical Research

, Volume 6, Issue 8, pp 660–666 | Cite as

Route of Administration and Sex Differences in the Pharmacokinetics of Aspirin, Administered as Its Lysine Salt

  • Leon Aarons
  • Katie Hopkins
  • Malcolm Rowland
  • S. Brossel
  • Jean-François Thiercelin
Article

Abstract

One thousand milligrams of aspirin, as its lysine salt, was administered intravenously, orally, and intramuscularly to nine male and nine female young healthy adult volunteers. After intravenous injection mean (±SD) values of clearance, steady-state volume of distribution, and terminal half-life were 12.2 ± 2.2 ml/min/kg, 0.219 ± 0.042 liter/kg, and 15.4 ± 2.5 min, respectively, with no differences between males and females. Following oral administration aspirin was absorbed more quickly in females than in males (mean absorption times of 16.4 and 21.3 min, respectively) although the bioavailability, 54%, was the same in both groups. In contrast, following intramuscular administration, aspirin was absorbed more slowly in females than males (mean absorption times of 97 and 53 min, respectively) but again the bioavailability, 89%, was the same in both groups. The data suggest that in the female the intramuscular injection is going into fat. Salicylic acid concentration–time profiles showed a less pronounced sex difference and were comparable among the three routes of administration.

aspirin pharmacokinetics intramuscular sex differences rate of absorption 

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Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • Leon Aarons
    • 1
  • Katie Hopkins
    • 2
  • Malcolm Rowland
    • 1
  • S. Brossel
    • 3
  • Jean-François Thiercelin
    • 3
  1. 1.Department of PharmacyUniversity of ManchesterManchesterU.K.
  2. 2.Medical Department, Medeval LimitedUniversity of ManchesterManchesterU.K.
  3. 3.Laboratoires d'Etudes et de Recherches Synthelabo (LERS)ParisFrance

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