Mood-stabilizing drug example: which of the following is a mood stabilizing drug used for bipolar illness?

• A. Quetiapine
• B. Lamotrigine
• C. Valproate
• D. Lithium

Answer: (D)

Mood stabilization in bipolar disorder means using a medication that helps prevent both manic and depressive episodes over the long term, rather than only treating acute symptoms.

Lithium is the classic mood stabilizer with the strongest and most consistent evidence for reducing recurrence of mood episodes in bipolar disorder and for lowering suicide risk. It has a long history of use as maintenance therapy, helping keep mood relatively stable across cycles, which is why it’s considered the best example of a mood stabilizer in this context. It does require regular blood level monitoring to stay within a safe therapeutic range and to minimize toxicity, and clinicians watch for kidney and thyroid effects, among other side effects.

Quetiapine is an antipsychotic with mood-stabilizing effects useful for mania and bipolar depression, but it’s not the traditional maintenance mood stabilizer on which long-term stabilization evidence is strongest. Lamotrigine is particularly helpful for bipolar depression and maintenance but is less effective for acute mania. Valproate works well for mania and maintenance in some patients but is not as universally established for long-term mood stabilization or for bipolar depression as lithium.