Table 1
Concomitant treatment
Drug
Patients receiving treatment
Daily dose (mg)
Digoxin
12
0.125–0.25
Furosemide
18
25–125
Warfarin
15
2.5–6
Aldactone
13
25–100
Nifedipine
0
—
Nitrates
0
—
Amiodarone
0
—