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Updated: Jul 14, 2026

Mass Spectrometry and Luminogenic-based Approaches to Characterize Phase I Metabolic Competency of In Vitro Cell Cultures
Published on: March 28, 2017
[The influence of clomipramine on CYP2D6 activity]
Monika Szewczuk-Bogusławska1, Andrzej Kiejna, Magdalena Grzesiak
1Katedra i Klinika Psychiatrii AM we Wrocławiu.
Aim:
Genetically determined activity ofCYP2D6 may be modified by some drugs through inhibition processes. Inhibition properties of TCA's were confirmed mainly in in vitro studies. The aim of the study was to assess the influence of clomipramine on CYP2D6 activity in vivo.
Method:
11 patients diagnosed with depression according to ICD-10 and DSM-IV (major depression) criteria were included in the study. In all the cases clomipramine therapy was indicated. CYP2D6 activity was assessed by the phenotyping method. All patients were treated simultaneously. Each of the patients ingested one tablet containing 100 mg of sparteine sulfate. Urine excreted during the following 6 h was collected. Based on sparteine metabolic ratio (MR) the phenotype status was estimated twice: after the wash-out period, before clomipramine treatment, sparteine metabolic ratio (MRI), and after 2-weeks of clomipramine treatment (MR2).
Results:
During clomipramine treatment MR2 values were statistically significantly higher than MRI. In 3 patients (27.3%) treated with clomipramine the changes of phenotype status were observed.
Conclusions:
Clomipramine is a CYP2D6 inhibitor and may change the CYP2D6 phenotype status (EM into PM).
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