A CASE OF RISPERIDONE OVERDOSE IN EARLY SCHIZOPHRENIA - A REVIEW OF POTENTIAL COMPLICATIONS

Deliberate drug overdose is a frequent occurrence in patients with sch izophrenia. Typical antipsychotic medications can be lethal at doses 5 times the recommended therapeutic range. Clozapine, an atypical antip sychotic, can be toxic at doses 4 times a moderate dose. Little is kno wn about the lethal effects of the novel antipsychotic risperidone, de spite the fact that it is now one of the most widely prescribed antips ychotics in North America. To date, only I death attributable to rispe ridone overdose has been reported. The case presented here documents a dverse cardiac effects in a 28-year-old man who intentionally ingested 24 mg of risperidone - 4 times the recommended dose. A potential drug interaction with fluvoxamine and the role of active metabolites are d iscussed.