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Pharmacokinetics of florfenicol and its metabolite, florfenicol amine, in rice field eel ( Monopterus albus ) after a single‐dose intramuscular or oral administration
Author(s) -
XIE L.L.,
WU Z.X.,
CHEN X.X.,
LI Q.,
YUAN J.,
LIU H.,
YANG Y.
Publication year - 2013
Publication title -
journal of veterinary pharmacology and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.527
H-Index - 60
eISSN - 1365-2885
pISSN - 0140-7783
DOI - 10.1111/j.1365-2885.2012.01413.x
Subject(s) - florfenicol , metabolite , pharmacokinetics , chemistry , oral administration , kidney , medicine , dosing , area under the curve , pharmacology , endocrinology , zoology , biology , biochemistry , antibiotics
The pharmacokinetics of florfenicol (FF) and its metabolite, florfenicol amine (FFA), were studied in rice field eel ( Monopterus albus ) after a single dose (20 mg/kg) by intramuscular (i.m.) or oral gavage (p.o.) dose at 25 °C. The elimination half‐lives ( t 1/2β ), peak concentration of FF ( C max ), and time to reach FF peak concentration ( T max ) in plasma were estimated as 18.39 h, 10.83 μg/mL, and 7.00 h, respectively, after i.m. injection and 13.46 h, 8.37 μg/mL, and 5 h, respectively, after p.o. administration. The T max values of FF in tissues (i.e., kidney, muscle, and liver) were larger for i.m. injection compared with those for p.o. administration. The t 1/2β had the following order kidney > muscle > liver for i.m. administrated and kidney > liver > muscle for p.o. administrated. The largest area under the concentration–time curve (AUC) was calculated to be 384.29 mg · h/kg after i.m. dosing, and the mean residence time (MRT) was 42.46 h by oral administration in kidney. FFA was also found in all tissues with a lower concentration than FF for both i.m. and p.o. administrations throughout the study. The elimination of FFA was slow with a t 1/2β between 18.19 and 47.80 h in plasma and tissues. The mean metabolic rate of FFA for i.m. and p.o. administrations was >23.30%.