Quinidine.
D000818:Animals; D001145:Arrhythmias, Cardiac / Q000188:drug therapy; D004077:Digoxin / Q000378:metabolism; D004347:Drug Interactions; D004562:Electrocardiography; D006329:Heart Conduction System / Q000187:drug effects; D006801:Humans; D007700:Kinetics; D011802:Quinidine / Q000378:metabolism / Q000494:pharmacology* / Q000633:toxicity
D004077:Digoxin; D011802:Quinidine