Variación intraindividual en los niveles plasmáticos de clozapina y norclozapina en la práctica clínica

Translated title of the contribution: Intra-individual variation of clozapine and norclozapine plasma levels in clinical practice

Maria Concepcion Turrion, Jesus Perez, Miguel Bernardo, Emilio Fernandez-Egea

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Introduction: Clozapine plasma levels are useful to monitor drug compliance, and also to assess and to prevent some side effects. Recently, routine monitoring to all clozapine-treated patients has been proposed to prevent relapses. However, high intra-individual variability in plasma levels has been reported too, although these studies have some limitations.

Methods: We analysed differences between 2 clozapine plasma levels separated by at least one year in a subgroup of 28 outpatients (82% male, mean age 47.9 years-old) with diagnosis of nonaffective psychosis in clinical remission whose clozapine doses and smoking habits remained unchanged.

Results: We found a non-significant increase in clozapine plasma levels [.30 mg/L (SD= .14) vs. .32 (SD = .17); t= -.858, p = .40] and a significant decrease in norclozapine plasma levels [.27 (SD = .11) vs. .22 (SD = .10); t =3.27; p = .003]. Absolute coefficient of variation (CV) between first and second assessment were calculated. Forty-six and fifty-seven percent of cases had CV 20% in clozapine and norclozapine, respectively. CV of 50% was seen in 20.7% and 13.8% of clozapine and norclozapine test respectively. We discussed potential causes of such high CV.

Conclusions: Our study suggest high intra-individual variation even in a subgroup of very stable patients, which suggest that routine monitoring of these levels may be indicated in order to detect significant plasma variations. We think that clinicians should act with caution in case of a sudden decrease in plasma level. In the absence of obvious symptom severity variation, sources of intra-individual fluctuations might be considered first, before assuming poor compliance. (C) 2019 SEP y SEPB. Published by Elsevier Espana, S.L.U. All rights reserved.

Translated title of the contributionIntra-individual variation of clozapine and norclozapine plasma levels in clinical practice
Original languageSpanish
Pages (from-to)31-35
Number of pages5
JournalRevista de Psiquiatría y Salud Mental
Issue number1
Early online date21 May 2019
Publication statusPublished - Jan 2020


  • Clozapine
  • Norclozapine
  • Plasma levels
  • Therapeutic drug monitoring

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