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1 Twice daily administration of 0.25 mg digoxin tablets (Lanoxin) or of 0.2 mg digoxin in solution in soft gelatin capsules (Lanoxicaps) produced similar mean steady state plasma digoxin concentrations in ten healthy volunteers. Respective values were 1.07 +/- 0.075 and 0.95 +/- 0.048 ng ml-1. 2 During continued administration, peak plasma concentrations occurred earlier after capsules with a tendency to higher peak levels. However, area under curve determinations over 7 h were similar. 3 Approximately 10% less digoxin was recovered in urine collected in a 12 h dosage interval during the lower dosage administration of capsules. Mean percentage urinary recovery of administered dose was 57% for tablets and 65% for capsules. 4 The enhanced bioavailability of Lanoxicaps was associated with reduced between-subject variability in plasma concentration. 5 Lanoxicaps (0.2 mg) should be approximately equivalent in effect to digoxin tablets (0.25 mg) currently available in the United Kingdom, though improved consistency would be anticipated.
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