Trapidil does not affect serum levels and cardiotonic action of digoxin in healthy humans.

The influence of trapidil on serum levels and cardiac effects of digoxin was investigated in 10 healthy men, intraindividually compared with placebo. Each subject took digoxin orally for 9 days (0.375 mg daily on days 1 to 8, 0.25 mg on day 9) either combined with trapidil (400 mg daily on days 1 to 8, 200 mg on day 9) or combined with placebo in a cross-over design. Trapidil failed to change significantly the steady-state serum digoxin concentrations on day 9 of treatment. It did also not alter significantly the following digoxin effects: shortening in QS2c time indicating the cardiotonic digoxin effect, shortening in QTc time, increase in PTQ index. But trapidil prevented the negative chronotropic digoxin effect.