title: Sensitive and quantitative determination of plasma doxepin and desmethyldoxepin in chronic pain patients by gas chromatography and mass spectrometry.
mesh_terms: D002908:Chronic Disease; D004311:Double-Blind Method; D004316:Doxepin / Q000031:analogs & derivatives* / Q000097:blood* / Q000627:therapeutic use; D004341:Drug Evaluation; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D010146:Pain / Q000097:blood / Q000188:drug therapy*; D010349:Patient Compliance
chemical_list: D004316:Doxepin; C028701:desmethyldoxepin