Clozapine induced blood dyscrasias and a therapeutical approach

Abstract

Introduction

Clozapine is a neuroleptic commonly used in treatments resistant to schizophrenia. However, despite the benefits, clozapine might cause some serious side effects. Hence, it is of the utmost necessity to keep an exacting control of the patients.

Objectives

To study some of the therapeutical approaches to the treatment of clozapine induced neutropenia and agranulocytosis.

Methods

Review of some articles in Mental Health Journals.

Results

The treatment with clozapine, substratum of aminergic and muscarinic receptors, entails a 0.9% risk of causing agranulocytosis, and approximately a 2.7% risk of causing neutropenia. Both occur, over 80% of them, during the first 18 weeks of treatment. Thus, before starting it, it is necessary to draw some blood and analyze the complete blood count (CBC). Also, we must analyze CBCs weekly during the first 18 weeks. Other dyscrasias like leukopenia, leukocytosis, anaemia, eoshinophilia, thrombocythaemia or thrombocytopenia can also be observed. When agranulocytosis appears, it can be treated by discontinuing the clozapine treatment, but also using granulocyte-colony stimulating factor or lithium, both separated or combined with clozapine. Lithium produces reversible leukocytosis onceplasma levels of > 0.4 mmol/L are reached. Despite the simultaneous treatment with lithium, clozapine can trigger some neurological side effects, it seems that seizure risk remains invariable.

Conclusions

Some of the clozapine's side effects, like neutropenia or agranulocytosis, are potentially lethal. Their treatment consists of discontinuing clozapine or initiating granulocyte-colony stimulating factor or lithium. These are good options that can give rise to a later continued treatment with clozapine.

Disclosure of interest

The authors have not supplied their declaration of competing interest.