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In a placebo controlled double-blind study including 10 patients with heart failure the nisoldipine/digoxin interaction was studied. Nisoldipine was shown to elevate digoxin plasma concentrations significantly by about 15% (trough levels). During chronic combination therapy with nisoldipine trough levels and plasma concentrations 4 h after the morning dose of digoxin were 1.35 +/- 0.14 and 1.92 +/- 0.16 ng ml-1 respectively, whereas they averaged to 1.16 +/- 0.14 and 1.52 +/- 0.16 ng ml-1 with digoxin and placebo (P less than 0.05; mean +/- s.e. mean). Systolic time intervals were significantly altered by nisoldipine co-administration compared with digoxin plus placebo. In certain patients the elevation of digoxin plasma levels due to nisoldipine co-administration could be of clinical relevance.
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