title: Effect of enrofloxacin on digoxin clearance and steady-state serum concentrations in dogs.
abstract: The effect of enrofloxacin on the oral clearance and steady-state concentrations of digoxin in serum was evaluated in dogs. Digoxin was administered orally to six healthy adult Beagle dogs following a multiple-dose regimen of 0.0625 mg every 12 h for 23 days. From days 14 to 23 enrofloxacin was administered orally at a dosage of 2.5 mg/kg every 12 h, with subjects receiving enrofloxacin 2 h prior to digoxin. Trough serum concentrations of digoxin were measured using an immunoassay technique. On days 13 and 22, dogs were catheterized for multiple blood sample collection during the 12 h digoxin dosing interval and serum samples were analyzed for digoxin concentrations. In general, steady-state digoxin concentrations in trough serum were not significantly different during enrofloxacin treatment than before enrofloxacin administration. Similarly, digoxin oral clearance was not significantly different between pre-enrofloxacin and digoxin + enrofloxacin periods. We conclude that enrofloxacin is unlikely to have a significant impact on digoxin disposition in dogs.
authors.affiliation: Department of Anatomy and Physiology, University of Prince Edward Island, Charlottetown.
authors.forename: M J
authors.initials: MJ
authors.lastname: Novotny
authors.forename: D H
authors.initials: DH
authors.lastname: Shaw
mesh_terms: D042462:4-Quinolones; D000284:Administration, Oral; D000818:Animals; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000494:pharmacology*; D004077:Digoxin / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D004285:Dogs / Q000097:blood / Q000378:metabolism*; D004347:Drug Interactions; D004359:Drug Therapy, Combination; D000077422:Enrofloxacin; D005260:Female; D024841:Fluoroquinolones; D008297:Male; D015363:Quinolones
chemical_list: D042462:4-Quinolones; D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D015363:Quinolones; D000077422:Enrofloxacin; D004077:Digoxin