Title: Atypical antipsychotics: are they truly safer than typical antipsychotics? <br/>Author: Hong Kim<br/><a href='http://umem.org/profiles/faculty/526/'>[Click to email author]</a><hr/><p> Antipsychotic as a class has diverse range of toxicity. The atypical (2<sup>nd</sup> generation) antipsychotics are considered to possess less toxicologic manifestation compared to the typical (1<sup>st</sup> generation) antipsychotics - lower K channel blockade and minimum Na channel blockade properties. However, select atypical antipsychotics overdose can results in significant morbidity in addition to sedation.</p> <p> </p> <p> Alpha-1 blockade (hypotension)</p> <ul> <li> Clozapine</li> <li> Olanzapine</li> <li> Quetiapine</li> <li> Risperidone</li> <li> Ziprasidone</li> </ul> <p> </p> <p> Antimuscarinic effect (anticholinergic toxicity)</p> <ul> <li> Clozapine</li> <li> Olanzapine</li> <li> Quetiapine</li> </ul> <p> </p> <p> Delayed rectifier K channel blockade (QT prolongation)</p> <ul> <li> Ertindole</li> <li> Ziprasidone</li> </ul> <p> </p> <p> <strong>Bottom line: </strong>Although lethal overdose from atypical antipsychotics are rare, they can result in significant clinical toxicity when ingested alone or in combintation with other classes of medications.</p> <p> </p> <p> </p>