title: How long should drug therapy for depression be maintained?
mesh_terms: D003866:Depressive Disorder / Q000188:drug therapy* / Q000523:psychology; D004334:Drug Administration Schedule; D006801:Humans; D008094:Lithium / Q000008:administration & dosage / Q000627:therapeutic use*; D012008:Recurrence
chemical_list: D008094:Lithium