Which of the following types of medications is not a mood stabilizer?

Antidepressants are not classified as mood stabilizers, which is why this choice is correct. Mood stabilizers are primarily used in the treatment of mood disorders, particularly bipolar disorder, to help control and stabilize mood fluctuations. Common examples of mood stabilizers include lithium and valproate, which are specifically designed to prevent the extremes of mood swings.

While quetiapine is primarily an antipsychotic, it is sometimes used in the management of mood disorders, particularly in bipolar disorder, and can have mood-stabilizing properties. However, it is not primarily categorized as a mood stabilizer. In contrast, antidepressants are primarily used to treat depressive disorders and can sometimes exacerbate mood instability in individuals with bipolar disorder, which further distinguishes them from true mood stabilizers. Thus, the distinction is clear: antidepressants lack the stabilizing effects on mood fluctuations that are characteristic of mood stabilizing medications.