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The Journal of Neuropsychiatry and Clinical Neurosciences, VOL. 6, No. 3

Article | August 01, 1994

Clozapine-induced seizures and EEG changes

The Journal of Neuropsychiatry and Clinical Neurosciences 1994;6:250-256.

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Abstract

Clozapine, an atypical antipsychotic drug, is widely used in refractory schizophrenia. At New Hampshire Hospital, 7 of the first 35 patients treated (20%) had convulsions. Patterns were tonic-clonic (5), complex partial (2), and myoclonic (3). Seizures were dose-related and may be anticholinergic in etiology. EEG changes are frequent with clozapine, particularly as dosage is increased. Twenty-six of 35 patients (74%) had EEG abnormalities at some time during clozapine treatment. EEG is a sensitive means of detecting clinical toxicity. When EEG abnormalities (slowing, dysrhythmia, or paroxysmal discharges) are detected, immediately lowering the dose by at least 25-50 mg per day and adjusting weekly until EEG returns to baseline can reduce the incidence of seizures.

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