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  • Title: Can we prevent blood dyscrasia (leucopenia, thrombocytopenia) and epileptic seizures induced by clozapine.
    Author: Herceg M, Muzinić L, Jukić V.
    Journal: Psychiatr Danub; 2010 Mar; 22(1):85-9. PubMed ID: 20305597.
    Abstract:
    Clozapine is associated with various haematological adverse effects, including leukopenia, neutropenia, agarnulocytosis, leukocytosis, anaemia, eosinophilia, thrombocytopenia and thrombocythaemia. Recognition and treatment of clozapine-related seizures also will become increasingly important as clozapine use grows in the 1990s. The decision to stop clozapine as a result of haematological adverse effects or seizures is a frustrating one for the clinician, and frequently disastrous for the patient. Cessation of treatment results in relapse. In case that patient is unresponsive to other antipsychotic, restarting clozapine should be consider, despite the risk involved. As the risk of a second agranulocytosis is much higher in those patients, various methods of militating against repeat blood dyscrasias have been treated, including granulocyte colony-stimulating factor and lithium. The decision to restart clozapine should be taken on case-by-case basis and should take into account the likely risks and benefits of restarting. Prior response to clozapine and magnitude of patient deterioration on stopping treatment are important factors to take into this consideration. Clozapine-related seizures did not preclude successful treatment with clozapine. A strategy that has been proposed to reduce the occurrence of seizures is the addition of an anticonvulsant agent. However, clozapine does induce a variety of adverse effects, most of which are of limited duration and either preventable or manageable if a number of simple clinical procedures are followed. With careful haematologyc control, the risk of agranulocytosis can be minimized and in case of clozapine related seizures recommendations include dose reduction, electroencephalogram (EEG), plasma-level monitoring and prophylactic antiepileptic treatment. Re-exposure to clozapine may rarely be attempted where there are facilities for very close and frequent monitoring.
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