Document Detail

Effects of prior feeding on pharmacokinetics and estimated bioavailability after oral administration of a single dose of microencapsulated erythromycin base in healthy foals.
MedLine Citation:
PMID:  10976728     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To determine effects of prior feeding on pharmacokinetics and estimated bioavailability of orally administered microencapsulated erythromycin base (MEB) in healthy foals. ANIMALS: 6 healthy foals, 3 to 5 months old. PROCEDURE: Foals were given 2 doses of MEB (25 mg/kg of body weight, PO). One dose was administered after food was withheld overnight, and the other was administered after foals had consumed hay. The study used a crossover design with a 2-week period between doses. Blood was collected via a jugular vein prior to and at specific times after drug administration. Concentrations of erythromycin A and anhydroerythromycin A in plasma were determined, using high-performance liquid chromatography. Results pharmacokinetic analysis of plasma concentration-time data for food-withheld and fed conditions were compared. RESULTS: Plasma concentrations of erythromycin A for foals were lower after feeding than concentrations when food was withheld. Area under the plasma concentration-time curve, maximum plasma concentration, and estimated bioavailability were greater in foals when food was withheld than when foals were fed. Anhydroerythromycin A was detected in plasma after administration of MEB in all foals. CONCLUSIONS AND CLINICAL RELEVANCE: Foals should be given MEB before they are fed hay. Administration of MEB to foals from which food was withheld overnight apparently provides plasma concentrations of erythromycin A that exceed the minimum inhibitory concentration of Rhodococcus equi for approximately 5 hours. The dosage of 25 mg/kg every 8 hours, PO, appears appropriate.
J Lakritz; W D Wilson; A E Marsh; J E Mihalyi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of veterinary research     Volume:  61     ISSN:  0002-9645     ISO Abbreviation:  Am. J. Vet. Res.     Publication Date:  2000 Sep 
Date Detail:
Created Date:  2001-01-23     Completed Date:  2001-01-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375011     Medline TA:  Am J Vet Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1011-5     Citation Subset:  IM    
Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia 65211, USA.
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MeSH Terms
Administration, Oral
Anti-Bacterial Agents / administration & dosage*,  pharmacokinetics*
Biological Availability
Drug Compounding / veterinary*
Erythromycin / administration & dosage*,  pharmacokinetics*
Horses / metabolism*
Reg. No./Substance:
0/Anti-Bacterial Agents; 114-07-8/Erythromycin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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