Which of the following medications is an antipsychotic often used in bipolar disorder treatment?

Olanzapine is an atypical antipsychotic that is commonly used in the treatment of bipolar disorder, particularly for managing acute manic or mixed episodes and for maintenance therapy. This medication works by affecting various neurotransmitter systems in the brain, particularly dopamine and serotonin, which play key roles in mood regulation.

Olanzapine is effective in reducing the symptoms of mania and can help stabilize mood, making it a valuable option in the treatment regimen for individuals with bipolar disorder. Its ability to manage symptoms so effectively is one of the reasons it is frequently chosen in clinical practice for this disorder.

Other medications listed, such as Divalproex and Carbamazepine, are primarily anticonvulsants that are also mood stabilizers, while Lamotrigine is used mainly to prevent depressive episodes in bipolar disorder. However, they do not function primarily as antipsychotics, which is why they are less effective for immediate management of acute manic episodes compared to Olanzapine.