Eggert Hansen C, Rosted Christensen T, Elley J, Bolvig Hansen L, Kragh-Sorensen P, Larsen NE, Naestoft J, Hvidberg EF. Clinical pharmacokinetic studies of perphenazine.
Br J Clin Pharmacol 1976;
3:915-23. [PMID:
973987 PMCID:
PMC1428936 DOI:
10.1111/j.1365-2125.1976.tb00647.x]
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Abstract
A gas-chromatographic method was used for the study in man of the kinetics of perphenazine (PPZ) and its sulphoxide metabolite (PPZ-SO). Various forms of PPZ administration were applied in eighteen schizophrenic patients and four healthy volunteers. Following an i.v. dose of 5 or 6 mg a considerable fluctuation in the plasma concentration was noted before the exponential elimination phase. The average terminal half-life of PPZ was approximately 9.5 hours. PPZ-SO showed up quickly but in low concentrations. After an oral dose of 6 mg no PPZ was detected in plasma and PPZ-SO only as traces. During continuous oral medication, 12 mg three times daily, a low systemic availability and a high PPZ-SO/PPZ ratio was found suggesting a marked first pass effect. PPZ-enanthate given i.m. fortnightly resulted in PPZ-levels comparable to those seen after continuous oral medication, but PPZ-SO concentration were much lower. No accumulation was observed. The systemic clearance rate (average approximately 100 1/h) was the same after PPZ-enanthate i.m. and PPZ i.v., but varied three-fold individually. Side effects were mostly, but not always, registered concomitant with high plasma levels of PPZ.
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