title: Beta blockers and verapamil: a cautionary tale.
mesh_terms: D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000188:drug therapy*; D001262:Atenolol / Q000009:adverse effects*; D004359:Drug Therapy, Combination; D006801:Humans; D008875:Middle Aged; D014700:Verapamil / Q000009:adverse effects*
chemical_list: D001262:Atenolol; D014700:Verapamil