title: Amitriptyline blood levels and relapse.
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000639:Amitriptyline / Q000008:administration & dosage / Q000009:adverse effects / Q000097:blood*; D001714:Bipolar Disorder / Q000188:drug therapy / Q000517:prevention & control*; D004311:Double-Blind Method; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009661:Nortriptyline / Q000097:blood; D012008:Recurrence; D013997:Time Factors
chemical_list: D000639:Amitriptyline; D009661:Nortriptyline