Enrofloxacin and marbofloxacin in horses: comparison of pharmacokinetic parameters, use of urinary and metabolite data to estimate first-pass effect and absorbed fraction

Enrofloxacin and marbofloxacin are two veterinary fluoroquinolones used to treat severe bacterial infections in horses. A repeated measures study has been designed to compare their pharmacokinetic parameters, to investigate their bioavailability and to estimate their absorbed fraction and first-pass...

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Published inJournal of veterinary pharmacology and therapeutics Vol. 29; no. 5; pp. 337 - 344
Main Authors PEYROU, M, BOUSQUET-MELOU, A, LAROUTE, V, VRINS, A, DOUCET, M.Y
Format Journal Article
LanguageEnglish
Published Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01.10.2006
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Abstract Enrofloxacin and marbofloxacin are two veterinary fluoroquinolones used to treat severe bacterial infections in horses. A repeated measures study has been designed to compare their pharmacokinetic parameters, to investigate their bioavailability and to estimate their absorbed fraction and first-pass effect by using plasma, urinary and metabolite data collected from five healthy mares. Clearance and Vd₍ss₎ were greater for enrofloxacin (mean ± SD = 6.34 ± 1.5 mL/min/kg and 2.32 ± 0.32 L/kg, respectively) than for marbofloxacin (4.62 ± 0.67 mL/min/kg and 1.6 ± 0.25 L/kg, respectively). Variance of the AUC₀₋inf of marbofloxacin was lower than that for enrofloxacin, with, respectively, a CV = 15% and 26% intravenously and a CV = 31% and 55% after oral administration. Mean oral bioavailability was not significantly different between marbofloxacin (59%) and enrofloxacin (55%). The mean percentage of the dose eliminated unchanged in urine was significantly higher for marbofloxacin (39.7%) than that for enrofloxacin (3.4%). Absorbed fraction and first-pass effect were only determinable for enrofloxacin, whereas the percentage of the dose absorbed in the portal circulation was estimated to be 78% and the fraction not extracted during the first pass through the liver was 65%. Consequently, the moderate observed bioavailability of enrofloxacin appears to be mainly caused by hepatic first-pass effect.
AbstractList Enrofloxacin and marbofloxacin are two veterinary fluoroquinolones used to treat severe bacterial infections in horses. A repeated measures study has been designed to compare their pharmacokinetic parameters, to investigate their bioavailability and to estimate their absorbed fraction and first‐pass effect by using plasma, urinary and metabolite data collected from five healthy mares. Clearance and Vd(ss) were greater for enrofloxacin (mean ± SD = 6.34 ± 1.5 mL/min/kg and 2.32 ± 0.32 L/kg, respectively) than for marbofloxacin (4.62  ±  0.67 mL/min/kg and 1.6 ± 0.25 L/kg, respectively). Variance of the AUC0‐inf of marbofloxacin was lower than that for enrofloxacin, with, respectively, a CV = 15% and 26% intravenously and a CV = 31% and 55% after oral administration. Mean oral bioavailability was not significantly different between marbofloxacin (59%) and enrofloxacin (55%). The mean percentage of the dose eliminated unchanged in urine was significantly higher for marbofloxacin (39.7%) than that for enrofloxacin (3.4%). Absorbed fraction and first‐pass effect were only determinable for enrofloxacin, whereas the percentage of the dose absorbed in the portal circulation was estimated to be 78% and the fraction not extracted during the first pass through the liver was 65%. Consequently, the moderate observed bioavailability of enrofloxacin appears to be mainly caused by hepatic first‐pass effect.
Enrofloxacin and marbofloxacin are two veterinary fluoroquinolones used to treat severe bacterial infections in horses. A repeated measures study has been designed to compare their pharmacokinetic parameters, to investigate their bioavailability and to estimate their absorbed fraction and first-pass effect by using plasma, urinary and metabolite data collected from five healthy mares. Clearance and V sub(d(ss)) were greater for enrofloxacin (mean plus or minus SD = 6.34 plus or minus 1.5 mL/min/kg and 2.32 plus or minus 0.32 L/kg, respectively) than for marbofloxacin (4.62 plus or minus 0.67 mL/min/kg and 1.6 plus or minus 0.25 L/kg, respectively). Variance of the AUC sub(0-inf) of marbofloxacin was lower than that for enrofloxacin, with, respectively, a CV = 15% and 26% intravenously and a CV = 31% and 55% after oral administration. Mean oral bioavailability was not significantly different between marbofloxacin (59%) and enrofloxacin (55%). The mean percentage of the dose eliminated unchanged in urine was significantly higher for marbofloxacin (39.7%) than that for enrofloxacin (3.4%). Absorbed fraction and first-pass effect were only determinable for enrofloxacin, whereas the percentage of the dose absorbed in the portal circulation was estimated to be 78% and the fraction not extracted during the first pass through the liver was 65%. Consequently, the moderate observed bioavailability of enrofloxacin appears to be mainly caused by hepatic first-pass effect.
Enrofloxacin and marbofloxacin are two veterinary fluoroquinolones used to treat severe bacterial infections in horses. A repeated measures study has been designed to compare their pharmacokinetic parameters, to investigate their bioavailability and to estimate their absorbed fraction and first-pass effect by using plasma, urinary and metabolite data collected from five healthy mares. Clearance and V(d(ss)) were greater for enrofloxacin (mean +/- SD = 6.34 +/- 1.5 mL/min/kg and 2.32 +/- 0.32 L/kg, respectively) than for marbofloxacin (4.62 +/- 0.67 mL/min/kg and 1.6 +/- 0.25 L/kg, respectively). Variance of the AUC(0-inf) of marbofloxacin was lower than that for enrofloxacin, with, respectively, a CV = 15% and 26% intravenously and a CV = 31% and 55% after oral administration. Mean oral bioavailability was not significantly different between marbofloxacin (59%) and enrofloxacin (55%). The mean percentage of the dose eliminated unchanged in urine was significantly higher for marbofloxacin (39.7%) than that for enrofloxacin (3.4%). Absorbed fraction and first-pass effect were only determinable for enrofloxacin, whereas the percentage of the dose absorbed in the portal circulation was estimated to be 78% and the fraction not extracted during the first pass through the liver was 65%. Consequently, the moderate observed bioavailability of enrofloxacin appears to be mainly caused by hepatic first-pass effect.
Enrofloxacin and marbofloxacin are two veterinary fluoroquinolones used to treat severe bacterial infections in horses. A repeated measures study has been designed to compare their pharmacokinetic parameters, to investigate their bioavailability and to estimate their absorbed fraction and first-pass effect by using plasma, urinary and metabolite data collected from five healthy mares. Clearance and Vd₍ss₎ were greater for enrofloxacin (mean ± SD = 6.34 ± 1.5 mL/min/kg and 2.32 ± 0.32 L/kg, respectively) than for marbofloxacin (4.62 ± 0.67 mL/min/kg and 1.6 ± 0.25 L/kg, respectively). Variance of the AUC₀₋inf of marbofloxacin was lower than that for enrofloxacin, with, respectively, a CV = 15% and 26% intravenously and a CV = 31% and 55% after oral administration. Mean oral bioavailability was not significantly different between marbofloxacin (59%) and enrofloxacin (55%). The mean percentage of the dose eliminated unchanged in urine was significantly higher for marbofloxacin (39.7%) than that for enrofloxacin (3.4%). Absorbed fraction and first-pass effect were only determinable for enrofloxacin, whereas the percentage of the dose absorbed in the portal circulation was estimated to be 78% and the fraction not extracted during the first pass through the liver was 65%. Consequently, the moderate observed bioavailability of enrofloxacin appears to be mainly caused by hepatic first-pass effect.
Enrofloxacin and marbofloxacin are two veterinary fluoroquinolones used to treat severe bacterial infections in horses. A repeated measures study has been designed to compare their pharmacokinetic parameters, to investigate their bioavailability and to estimate their absorbed fraction and first‐pass effect by using plasma, urinary and metabolite data collected from five healthy mares. Clearance and V d(ss) were greater for enrofloxacin (mean ± SD = 6.34 ± 1.5 mL/min/kg and 2.32 ± 0.32 L/kg, respectively) than for marbofloxacin (4.62  ±  0.67 mL/min/kg and 1.6 ± 0.25 L/kg, respectively). Variance of the AUC 0‐inf of marbofloxacin was lower than that for enrofloxacin, with, respectively, a CV = 15% and 26% intravenously and a CV = 31% and 55% after oral administration. Mean oral bioavailability was not significantly different between marbofloxacin (59%) and enrofloxacin (55%). The mean percentage of the dose eliminated unchanged in urine was significantly higher for marbofloxacin (39.7%) than that for enrofloxacin (3.4%). Absorbed fraction and first‐pass effect were only determinable for enrofloxacin, whereas the percentage of the dose absorbed in the portal circulation was estimated to be 78% and the fraction not extracted during the first pass through the liver was 65%. Consequently, the moderate observed bioavailability of enrofloxacin appears to be mainly caused by hepatic first‐pass effect.
Author LAROUTE, V
PEYROU, M
BOUSQUET-MELOU, A
VRINS, A
DOUCET, M.Y
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Issue 5
Keywords Fluoroquinolones
Administration
Enzyme Inhibitors
Area Under Curve
Intravenous
Half-Life
Biological Availability
Oral
Anti-Infective Agents
Quinolones
Injections
Animals
Horses
Female
Ciprofloxacin
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Snippet Enrofloxacin and marbofloxacin are two veterinary fluoroquinolones used to treat severe bacterial infections in horses. A repeated measures study has been...
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SubjectTerms Administration, Oral
Animals
Anti-Infective Agents
Anti-Infective Agents - administration & dosage
Anti-Infective Agents - metabolism
Anti-Infective Agents - pharmacokinetics
antimicrobial agents
Area Under Curve
bioavailability
Biological Availability
blood chemistry
chemical composition
Ciprofloxacin
Ciprofloxacin - metabolism
Ciprofloxacin - pharmacokinetics
dosage
drug excretion
enrofloxacin
Enzyme Inhibitors
Enzyme Inhibitors - administration & dosage
Enzyme Inhibitors - metabolism
Enzyme Inhibitors - pharmacokinetics
Female
Fluoroquinolones
Fluoroquinolones - administration & dosage
Fluoroquinolones - metabolism
Fluoroquinolones - pharmacokinetics
Half-Life
Horses
Injections, Intravenous
intravenous injection
Life Sciences
marbofloxacin
metabolites
oral administration
Pharmaceutical sciences
pharmacokinetics
Pharmacology
Quinolones
Quinolones - administration & dosage
Quinolones - metabolism
Quinolones - pharmacokinetics
uptake mechanisms
urine
Title Enrofloxacin and marbofloxacin in horses: comparison of pharmacokinetic parameters, use of urinary and metabolite data to estimate first-pass effect and absorbed fraction
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https://www.ncbi.nlm.nih.gov/pubmed/16958777
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https://search.proquest.com/docview/68831852
https://hal.science/hal-00517561
Volume 29
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