Pharmacokinetics and bioavailability after intramuscular injection of the 5-HT 1A serotonin agonist R-8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT) in domestic goats (Capra aegagrus hircus)

Silke Pfitzer, Andrew P. Woodward, Liesel Laubscher, Kristin Warren, Rebecca Vaughan-Higgins, Jacobus P. Raath, Michael Laurence

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3 Citations (Scopus)

Abstract

To determine the bioavailability and pharmacokinetic properties of the serotonin 5-HT 1A receptor agonist R-8-OH-DPAT in goats, and 0.1 mg kg −1 R-8-OH-DPAT hydrobromide was administered intramuscularly (i.m.) and intravenously (i.v.) to six goats in a two-phase cross-over design experiment. Venous blood samples were collected from the jugular vein 2, 5, 10, 15, 20, 30, 40 and 60 min following treatment and analysed by liquid chromatography tandem mass spectrometry. Bioavailability and pharmacokinetic parameters were determined by a one-compartment analysis. Mean bioavailability of R-8-OH-DPAT when injected i.m. was 66%. The mean volume of distribution in the central compartment was 1.47 L kg −1 . The mean plasma body clearance was 0.056 L kg −1  min −1 . All goats injected i.v. and two of six goats injected i.m. showed signs of serotonin toxicity. In conclusion, R-8-OH-DPAT is well absorbed following i.m. injection and the observed pharmacokinetics suggest that administration via dart is feasible. Administration of R-8-OH-DPAT hydrobromide, at a dosage of 0.1 mg kg −1 , resulted in the observation of clinical signs of serotonin toxicity in the goats. It is suggested that dosages for the clinical use of the compound should be lower in order to achieve the desired clinical effect without causing serotonin toxicity.

Original languageEnglish
Pages (from-to)251-257
Number of pages7
JournalJournal of Veterinary Pharmacology and Therapeutics
Volume42
Issue number3
DOIs
Publication statusPublished - May 2019
Externally publishedYes

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