Which atypical antipsychotic is indicated for bipolar depression, mania, and maintenance, but has risks for QT prolongation and eosinophilia?

The correct answer is Ziprasidone. This atypical antipsychotic is indicated for a variety of mood disorders, including bipolar depression and mania, and it serves as an agent for maintenance therapy as well. While it is effective in managing the symptoms associated with bipolar disorder, one of its notable side effects is the risk for QT prolongation, which can lead to serious cardiac issues, particularly in certain patient populations or when combined with other medications that also have QT prolonging effects. Additionally, Ziprasidone has been associated with eosinophilia, an increase in eosinophils in the blood, which can signal an underlying hypersensitivity or allergic reaction.

This multifaceted application of Ziprasidone in treating various aspects of bipolar disorder, combined with its specific side effect profile, makes it an important consideration in the management of this condition. The other medications listed do not have the same indications or side effect profile associated with QT prolongation and eosinophilia.