the antiarrhythmic effect of disopyramide retard ( dr ) in a dose of 2 x 300 mg/day , propranolol retard ( pr ) in one of 1 x 160 mg/day and placebo was compared in a randomized crossover study in patients with ventricular premature beats ( vpb ) .
C0012702
disopyramide
C0151636
ventricular premature