title: Once daily versus twice daily beta-blockers: effects on arrhythmias and hypertension.
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000008:administration & dosage*; D001145:Arrhythmias, Cardiac / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D004334:Drug Administration Schedule; D006801:Humans; D006973:Hypertension / Q000188:drug therapy*
chemical_list: D000319:Adrenergic beta-Antagonists