Pharmacokinetics of amantadine in cats

K. T. Siao, B. H. Pypendop, S. D. Stanley, J. E. Ilkiw

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


This study reports the pharmacokinetics of amantadine in cats, after both i.v. and oral administration. Six healthy adult domestic shorthair female cats were used. Amantadine HCl (5mg/kg, equivalent to 4mg/kg amantadine base) was administered either intravenously or orally in a crossover randomized design. Blood samples were collected immediately prior to amantadine administration, and at various times up to 1440min following intravenous, or up to 2880min following oral administration. Plasma amantadine concentrations were determined by liquid chromatography-mass spectrometry, and plasma amantadine concentration-time data were fitted to compartmental models. A two-compartment model with elimination from the central compartment best described the disposition of amantadine administered intravenously in cats, and a one-compartment model best described the disposition of oral amantadine in cats. After i.v. administration, the apparent volume of distribution of the central compartment and apparent volume of distribution at steady-state [mean±SEM (range)], and the clearance and terminal half-life [harmonic mean±jackknife pseudo-SD (range)] were 1.5±0.3 (0.7-2.5) L/kg, 4.3±0.2 (3.7-5.0) L/kg, 8.2±2.1 (5.9-11.4) mL·min/kg, and 348±49 (307-465) min, respectively. Systemic availability [mean±SEM (range)] and terminal half-life after oral administration [harmonic mean±jackknife pseudo-SD (range)] were 130±11 (86-160)% and 324±41 (277-381) min, respectively.

Original languageEnglish
Pages (from-to)599-604
Number of pages6
JournalJournal of Veterinary Pharmacology and Therapeutics
Issue number6
StatePublished - Dec 2011

ASJC Scopus subject areas

  • Pharmacology
  • Veterinary (all)


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