title: Assay for amitriptyline and nortriptyline facilitated by use of "toxi-tubes" for extraction.
mesh_terms: D000639:Amitriptyline / Q000302:isolation & purification*; D002845:Chromatography; D006801:Humans; D008722:Methods; D009661:Nortriptyline / Q000302:isolation & purification*
chemical_list: D000639:Amitriptyline; D009661:Nortriptyline