Dissociative anaesthesia in free-ranging male koalas and selected marsupials in captivity.

M. Bush, J. Graves, S. J. O'Brien, D. E. Wildt

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Forty seven free-ranging, adult, male koalas were captured and administered an intramuscular injection of the dissociative anaesthetic, Telazol (tiletamine HCl plus zolazepam HCl), at dose rates of 5.0 to 7.7 mg/kg body weight. Anaesthesia induction was rapid and smooth and resulted in a surgical plane of anaesthesia lasting 30 to 45 min. There was no depression of heart rate or respiration. Mild salivation occurred in most animals, but was not a problem because the swallowing reflex was retained. There was no mortality or morbidity and the anaesthesia level was sufficient to allow electroejaculation and multiple blood sampling with no apparent animal discomfort. For 10 of 19 males in which anaesthesia was required for a 90 min protocol, a supplementary Telazol injection (average, 2.5 mg/kg) was necessary. All koalas recovered completely within 3 to 4 h of the initial injection. The results suggest that the optimal Telazol dosage for the adult male koala is 7.0 mg/kg body weight. The retrospective analysis of 259 anaesthesia records involving 14 species indicated that Telazol was equally effective and safe in other captive marsupials.

Original languageEnglish (US)
Pages (from-to)449-451
Number of pages3
JournalAustralian veterinary journal
Issue number12
StatePublished - Dec 1990
Externally publishedYes

ASJC Scopus subject areas

  • General Veterinary


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