title: Letter: Letters to the editor.
mesh_terms: D000818:Animals; D004070:Digitalis / Q000187:drug effects*; D004232:Diuretics / Q000494:pharmacology*; D004285:Dogs; D004347:Drug Interactions; D006321:Heart / Q000187:drug effects*; D006801:Humans; D010946:Plants, Medicinal; D010947:Plants, Toxic; D011188:Potassium / Q000097:blood
chemical_list: D004232:Diuretics; D011188:Potassium