Journal
JOURNAL OF CLINICAL PHARMACOLOGY
Volume 45, Issue 9, Pages 1032-1037Publisher
WILEY
DOI: 10.1177/0091270005278806
Keywords
exenotide; digoxin; gastric emptying; interaction; pharmacokinetics
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This open-label study investigated the effect of exenatide co-administration on the steady-state plasma pharmacokinetics of digoxin. A total of 21 healthy male subjects received digoxin (day 1, 0.5 mg twice daily; days 2-12, 0.25 mg once daily) and exenatide (days 8-12, 10 mu g twice daily). Digoxin plasma and urine concentrations were measured on days 7 and 12. Exenatide coadministration did not change the overall 24-h our steady-state digoxin exposure (AUC(tau,SS)) and C-min,C-SS but caused a 17% decrease in mean plasma digoxin C-max,C-SS (1.40 to 1.16 ng/mL) and an increase in digoxin t-(max,SS) (median increase, 2.5 hours). Although the decrease in digoxin C-max,C-SS was statistically significant, peak concentrations were within the therapeutic concentration range in all subjects. Digoxin urinary pharmacokinetic parameters were not altered. Gastrointestinal symptoms, the most common adverse effects of exenatide, decreased over time. Exenatide administration does not cause any changes in diaoxin steady-state pharmacokinetics that would be expected to have clinical sequelae; thus, dosage adjustment does not appear warranted, based on pharmacokinetic considerations.
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