title: Class 1B agents lidocaine, mexiletine, tocainide, phenytoin.
mesh_terms: D000889:Anti-Arrhythmia Agents / Q000145:classification*; D001145:Arrhythmias, Cardiac / Q000188:drug therapy; D006801:Humans; D008012:Lidocaine / Q000031:analogs & derivatives* / Q000627:therapeutic use*; D008801:Mexiletine / Q000627:therapeutic use*; D010672:Phenytoin / Q000627:therapeutic use*; D016677:Tocainide
chemical_list: D000889:Anti-Arrhythmia Agents; D008801:Mexiletine; D016677:Tocainide; D010672:Phenytoin; D008012:Lidocaine