European Journal of Clinical Pharmacology

, Volume 37, Issue 1, pp 29–32 | Cite as

Plasma protein binding of alpidem in healthy volunteers, in neonates and in liver or renal insufficiency

  • G. M. Pacifici
  • G. Bianchetti
  • A. Viani
  • G. Rizzo
  • M. Carrai
  • J. Allen
  • P. L. Morselli


The binding of alpidem, a new anxiolytic drug, has been studied in plasma from 6 healthy subjects, 12 patients with renal failure, 12 patients with liver cirrhosis and 12 chronic uraemics maintained on haemodialysis, as well as in 12 serum samples from the placental cord, to represent the situation in the newborn.

The unbound fraction was 0.61% (healthy volunteers), 1.31% (newborns), 0.86% (cirrhotic patients), 0.72 (patients with renal failure), 0.70% (before haemodialysis) and 0.79% (after haemodialysis). Binding in the volunteers was significantly different from that in neonates and cirrhotics only.

Alpidem became bound to isolated albumin (45 g·l−1) and alpha1-acid glycoprotein (0.75 g·l−1) to 97.2% and 97.1%, respectively. The bound fraction of the drug in a mixture of two proteins was 99.1%.

For alpidem, it appears that alpha1-acid glycoprotein may balance the effect of any decrease in the albumin concentration.

Key words

alpidem cirrhotics anxiolytics placental serum renal failure plasma protein binding neonates 


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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • G. M. Pacifici
    • 1
  • G. Bianchetti
    • 2
  • A. Viani
    • 2
  • G. Rizzo
    • 3
  • M. Carrai
    • 4
  • J. Allen
    • 2
  • P. L. Morselli
    • 2
  1. 1.Department of General Pathology, Medical SchoolUniversity of PisaItaly
  2. 2.Department of Clinical ResearchSYNTHELABO RECHERCHEParisFrance
  3. 3.Department of NephrologyHospital of PisaItaly
  4. 4.Department of GastroenterologyHospital of PisaItaly

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