Clozapine (Clozaril®), Seizures, and EEG Abnormalities

ABSTRACT.

The antipsychotic agent clozapine (Clozaril®) is reserved for the treatment of refractory psychosis. Clozapine has allowed many schizophrenic patients to lead more independent and productive lives, but its use is restricted by side effects. Clozapine has been shown to lower seizure threshold and produce significant EEG changes. Although not a commonly used drug, both clinical neurophysiology technologists and interpreting electroencephalographers need to be aware of the effects of clozapine on the EEG. We review the findings of two patients who developed neurological symptoms and EEG abnormalities that resolved following reduction of clozapine therapy.

KEY WORDS.:

• Clozapine
• Clozaril®
• EEG abnormalities
• myoclonus
• refractory psychosis
• seizures