Bipolar depression (depressive phase)

Reviewed by Shariq Refai, MD, MBA·Updated March 15, 2026·About 3 minutes

Canonical definition at Shrinktionary. This entry adds the depression-specific angle.

Sources

American Psychiatric Association. DSM-5-TR.
National Institute of Mental Health. Bipolar Disorder statistics.
Yatham LN, et al. Canadian Network for Mood and Anxiety Treatments (CANMAT) and International Society for Bipolar Disorders (ISBD) 2018 guidelines for the management of patients with bipolar disorder. Bipolar Disord. 2018.
Goodwin GM, et al. Evidence-based guidelines for treating bipolar disorder: revised third edition. J Psychopharmacol. 2016.

Primary source: NIMH: Bipolar disorder.

Frequently asked questions

How is bipolar depression different from major depressive disorder?

Bipolar depression looks identical to major depressive disorder during the depressive episodes. The difference is the rest of the picture. People with bipolar disorder also have, at some point in life, episodes of mania (bipolar I) or hypomania (bipolar II). The history is the key, not the current low mood.

Why does telling them apart matter?

Standard antidepressants alone can sometimes destabilize bipolar disorder, triggering mood elevation, mixed states, or rapid cycling. Bipolar depression usually requires a mood stabilizer or a specific antipsychotic with evidence in bipolar depression, sometimes with an antidepressant added carefully under specialist care.

What questions help reveal a bipolar history?

A clinician asks about every period of unusually elevated mood, racing thoughts, decreased need for sleep, faster speech, riskier decisions, and high energy that lasted at least four days (hypomania) or seven days (mania). Family history of bipolar disorder, age of first episode, and prior medication response also matter.

What medications are used for bipolar depression?

Lithium and lamotrigine are common mood stabilizers. Quetiapine, lurasidone, cariprazine, and the olanzapine-fluoxetine combination have FDA approval for bipolar depression. Choice depends on bipolar I versus II, prior response, side effects, and other conditions. A psychiatrist familiar with bipolar disorder is the right starting point.

Why is sleep so important in bipolar disorder?

Sleep regularity is one of the strongest stabilizing factors in bipolar disorder. Sleep loss can trigger mood elevation. Oversleeping can extend depressive episodes. Most treatment plans include explicit attention to sleep and wake times, sometimes with a brief structured therapy called Interpersonal and Social Rhythm Therapy (IPSRT).

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Last reviewed March 15, 2026.

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