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Effects of the concomitant administration of tamsulosin (0·8 mg) on the pharmacokinetic and safety profile of intravenous digoxin (Lanoxin®) in normal healthy subjects: a placebo‐controlled evaluation

A 20‐day, nonrandomized, open‐label, placebo‐controlled study was performed to investigate whether concomitant administration of tamsulosin (0·8 mg) affects the pharmacokinetic and safety profile of intravenous digoxin (0·5 mg) in healthy subjects. Ten healthy subjects aged 21–39 years received a single oral dose of placebo on study days 1–8 and tamsulosin on days 9–18. Tamsulosin was initiated at 0·4 mg/day and the dose was increased to 0·8 mg/day from day 11. On days 2 and 15, subjects received a single intravenous dose of digoxin (0·5 mg). Safety monitoring was carried out throughout the study. Following digoxin administration, blood was drawn and urine collected over a 96‐h period for pharmacokinetic determinations. Plasma tamsulosin concentrations were measured at regular intervals after dosing on day 15. The digoxin pharmacokinetic parameters with and without concomitant tamsulosin were compared. No significant difference was observed, and no irregularity was found in the plasma tamsulosin concentration data. Six subjects experienced adverse events while receiving placebo and seven while on tamsulosin. The most frequent adverse event was mild dizziness reported by four subjects. Moderate chest pain was reported in two subjects, but this was not considered to be related to the administration of the study medications. Some significant changes in vital signs were observed; however, none was accompanied by symptoms of medical concern. These changes were not temporally related to the administration of study drugs. Thus, concurrent administration of digoxin with tamsulosin did not produce any change in the pharmacokinetics of digoxin and the safety profile was acceptable. As reflected in the prescribing information for tamsulosin, no adjustment in tamsulosin dosing is required when it is administered concomitantly with digoxin.