Comparative Pharmacokinetics of Theophylline in Camels (Camelus dromedarius) and Goats (Caprus hircus)

H. A. Elsheikh, B. H. Ali, M. Zahurin, A. M. Mustafa, G. Alhadrami, A. K. Bashir

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A comparative randomized crossover study was conducted to determine the pharmacokinetics of theophylline in male and female camels (Camelus dromedarius) and goats (Caprus bircus). Theophylline is an established 'probe drug' to evaluate the drug metabolizing enzyme activity of animals. It was administered by the intravenous (i.v.) route and then intramuscularly (i.m.) at a dose of 2 mg/kg. The concentration of the drug in plasma was measured using a high-performance liquid chromatography (HPLC) technique on samples collected at frequent intervals after administration. Following i.v. injection, the overall elimination rate constant (λz) in goats was 0.006 ± 0.00076/min and in camels was 0.0046 ± 0.0008/min (P <0.01). The elimination half-life (t1/2λz) in goats (112.7 min) was lower than in camels (154.7 min) (P <0.01). The apparent volume of distribution (Izz) and the total body clearance (Cl) in goats were 1440.1 ± 166.6 ml/kg and 8.9 ± 1.4 ml/min/kg, respectively. The corresponding values in camels were 1720.3 ± 345.3 ml/kg and 6.1 ± 1.0 ml/min/kg, respectively. Alter i.m. administration, theophylline reached a peak plasma concentration (Cmax) of 1.8 ± 0.1 and 1.7 ± 0.2 μg/ml at a post-injection time (Tmax) of 67.5 ± 8.6 and 122.3 ± 6.7 min in goats and camels, respectively. The mean bioavailability (I.) in both goats and camels was 0.9 ± 0.2. The above data suggest that camels eliminate theophylline at a slower rate than goats.

Original languageEnglish
Pages (from-to)581-586
Number of pages6
JournalJournal of Veterinary Medicine Series A: Physiology Pathology Clinical Medicine
Volume48
Issue number10
DOIs
Publication statusPublished - Dec 2001

Fingerprint

Camelus
theophylline
Camelus dromedarius
camels
Theophylline
Goats
pharmacokinetics
Pharmacokinetics
goats
drugs
Pharmaceutical Preparations
intravenous injection
half life
bioavailability
Intravenous Injections
Cross-Over Studies
Biological Availability
Half-Life
high performance liquid chromatography
enzyme activity

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • veterinary(all)

Cite this

Comparative Pharmacokinetics of Theophylline in Camels (Camelus dromedarius) and Goats (Caprus hircus). / Elsheikh, H. A.; Ali, B. H.; Zahurin, M.; Mustafa, A. M.; Alhadrami, G.; Bashir, A. K.

In: Journal of Veterinary Medicine Series A: Physiology Pathology Clinical Medicine, Vol. 48, No. 10, 12.2001, p. 581-586.

Research output: Contribution to journalArticle

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