title: Antidepressant-resistant depression in the elderly.
mesh_terms: D000368:Aged; D000639:Amitriptyline / Q000008:administration & dosage; D000929:Antidepressive Agents, Tricyclic / Q000627:therapeutic use*; D003131:Combined Modality Therapy; D003863:Depression / Q000188:drug therapy*; D004351:Drug Resistance; D006801:Humans; D007099:Imipramine / Q000008:administration & dosage; D008094:Lithium / Q000494:pharmacology / Q000633:toxicity; D011613:Psychotherapy; D012306:Risk
chemical_list: D000929:Antidepressive Agents, Tricyclic; D000639:Amitriptyline; D008094:Lithium; D007099:Imipramine