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PHARMACOKINETICS AND TISSUE RESIDUES OF JOSAMYCIN IN FOWLS
Faculty
Veterinary Medicine
Year:
1992
Type of Publication:
Article
Pages:
113-116
Authors:
ElSayed, MGA, ELAZIZ, MIA, ELAZEM, AMA
Journal:
DEUTSCHE TIERARZTLICHE WOCHENSCHRIFT M H SCHAPER GMBH CO KG
Volume:
99
Research Area:
Veterinary Sciences
ISSN
ISI:A1992KB39400008
Keywords :
PHARMACOKINETICS , TISSUE RESIDUES , JOSAMYCIN , FOWLS
Abstract:
Josamycin is a macrolid antibiotic which is produced by fermentation of cultures of Streptomyces narbonensis. It was once administrated (18 mg/kg b. wt.) in fowls via intravenous, oral and intramuscular routes for determination of blood concentration, kinetic behaviour and bioavailability. Following a single intravenous injection, the blood concentration-time-curve indicated a two compartments open model with an elimination half life value (t1/2beta) of 1.83 +/- 0.06 hours. Both oral and intramuscular routes showed higher values, i. e. 2.33 +/- 0.13 and 2.85 +/- 0.17 hours. The lower apparent volume of distribution of Josamycin in fowls than one liter/kg elucidate higher distribution in blood than in tissues. Systemic bioavailability after both oral and intramuscular administration, i. e. 33.88 +/- 2.4 and 27.28 +/- 1.46 \% respectively, showed lower absorption from site of i. m. application. Josamycin was administrated (1 8 mg/kg b. wt.) intramuscularly and orally once daily for 5 consecutive days. The drug peaked in serum 1 hour (intramuscular) and 2 hours (orally) after each dose. The recorded results revealed that serum level of Josamycin was higher after oral application (29.98 +/- 1.92 mug/ml) than after i.m. application. The drug persisted in the lung tissues and fat for 72 hours after administration and disappeared from all body tissues 96 hours after the last dose of repeated administration.
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