Separation of perphenazine, its sulphoxide and its probable phenolic metabolites by electron-capture gas—liquid chromatography

Scope of differential UV and differential fluorescence assays for phenothiazines: comparison with official methods

Operational difficulties have been encountered with many of the official phenothiazine assay procedures in this laboratory. Although some difficulties were corrected, the procedures still lack specificity. Accordingly, the general scope of differential UV and differential fluorescence methods was investigated. These specific methods are facile, reproducible, and applicable to both composite and single-tablet assays.

Metabolic interaction between amitriptyline and perphenazine in psychiatric patients

1. 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. 2. Results reveal that AT and NT levels are independent of sex and hospital environment. 3. PPZ significantly increased the steady-state NT plasma levels, probably through inhibition of the hydroxylation biotransformation pathway, but had no effect on AT levels, thus indicating that PPZ has no influence on the desmethylation pathway, or alternatively, the hydroxylation of AT.