steady-state plasma level samples of sixty-five schizophrenic patients from two psychiatric hospitals assigned to three treatment groups ( amitriptyline 150 mg/day , perphenazine 20 mg/day and a combination of amitriptyline and perphenazine at 150 mg and 20 mg/day ) were assayed for amitriptyline ( at ) , endogenous nortriptyline ( nt ) and perphenazine ( ppz ) using gas-liquid chromatography .
C0002600
amitriptyline
C0028420
nortriptyline