Which of the following medications is NOT an atypical antipsychotic?

Haloperidol is indeed not classified as an atypical antipsychotic; rather, it belongs to the category of typical antipsychotics, also known as first-generation antipsychotics. The primary distinction between typical and atypical antipsychotics lies in their pharmacological profiles and side effect profiles. Typical antipsychotics primarily target dopamine D2 receptors, which can lead to a higher incidence of extrapyramidal side effects such as tardive dyskinesia.

On the other hand, atypical antipsychotics like Risperidone, Olanzapine, and Quetiapine typically have a broader mechanism of action, affecting both dopamine and serotonin receptors. This broader action not only helps to manage symptoms of psychosis effectively but also tends to minimize the risk of movement disorders that are more common with typical antipsychotics.

Thus, recognizing Haloperidol as a typical antipsychotic reinforces understanding the evolution of antipsychotic medications and their differing treatment implications for patients with psychiatric disorders.