High-dose Clozapine Withdrawal: A Case Report and Timeline of a Single Potential Withdrawal Seizure.

Clozapine, a second-generation antipsychotic (SGA), is known for its superior efficacy in the treatment of refractory schizophrenia. Clozapine's hallmark side effects are well-known, including, but not limited to, drug-induced seizures associated with daily goal doses greater than 600mg and rapid dose escalation, which can also contribute to significant risk of orthostatic hypotension, bradycardia, and syncope. However, less well-known is the potential withdrawal that can occur from its rapid discontinuation. Here, we describe a case of seizure-like activity that occurred 72 hours after an abrupt high-dose clozapine discontinuation in a patient with schizoaffective disorder, bipolar type. Seizures, although known to be a high-serum-concentration-dependent side effect of clozapine, could not be excluded as a possible withdrawal syndrome in this patient.