title: Effect of aspirin, furosemide, and commercial low-salt diet on digoxin pharmacokinetic properties in clinically normal cats.
abstract: Steady-state serum digoxin concentration ([digoxin]) was measured for 48 hours in 6 healthy cats after they were treated with digoxin tablets (0.01 mg/kg of body weight, q 48 h) for 10 days and again after concurrent treatment of identical duration with orally administered digoxin, aspirin (80 mg, q 48 h), furosemide (2 mg/kg, q 12 h), and a commercial low-salt diet. The concurrent treatment substantially altered digoxin pharmacokinetic properties, with a resultant increase in peak (mean +/- SEM; from 2.1 +/- 0.35 to 3.3 +/- 0.6 ng/ml), 8-hour (from 1.4 +/- 0.35 to 2.5 +/- 0.64 ng/ml), and 48-hour mean (from 1.1 +/- 0.22 to 2.2 +/- 0.57 ng/ml) serum [digoxin]; an increase in the number of hours during which serum [digoxin] was in the toxic range (from 3 +/- 1.7 to 24.7 +/- 9.8 h); and a decrease in oral clearance (from 0.15 +/- 0.04 to 0.08 +/- 0.02 L/h.kg). Of these differences, all but the 8-hour serum [digoxin] were significant at P less than 0.05. Similar sampling procedures were performed in 3 cats after administration of digoxin alone (0.01 mg/kg, q 48 h) until steady-state conditions were reached (10 days) and again after an additional 10 days of treatment. Differences were not noticed in digoxin pharmacokinetic properties. Eight-hour serum [digoxin] was shown to correlate closely with the mean serum [digoxin] at steady-state conditions when digoxin was administered every 48 hours. Variation in digoxin pharmacokinetic properties was noticed between cats.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison 53706.
authors.forename: C E
authors.initials: CE
authors.lastname: Atkins
authors.forename: P S
authors.initials: PS
authors.lastname: Snyder
authors.forename: B W
authors.initials: BW
authors.lastname: Keene
mesh_terms: D000284:Administration, Oral; D000818:Animals; D001241:Aspirin / Q000008:administration & dosage / Q000494:pharmacology*; D002415:Cats / Q000097:blood*; D004039:Diet, Sodium-Restricted; D004077:Digoxin / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D004338:Drug Combinations; D005260:Female; D005665:Furosemide / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male
chemical_list: D004338:Drug Combinations; D004077:Digoxin; D005665:Furosemide; D001241:Aspirin