Propranolol and quinidine.
D001145:Arrhythmias, Cardiac / Q000188:drug therapy*; D004347:Drug Interactions; D006321:Heart / Q000187:drug effects*; D006352:Heart Ventricles / Q000187:drug effects; D006801:Humans; D011433:Propranolol / Q000494:pharmacology*; D011802:Quinidine / Q000494:pharmacology*
D011433:Propranolol; D011802:Quinidine