Bipolar disorder research has been less productive than depression research over the past decade, with the major mood stabilizers (lithium, valproate, lamotrigine) and atypical antipsychotics remaining the foundation of treatment. Recent research has expanded into bipolar depression treatments, novel mood stabilizer mechanisms, and approaches for treatment-resistant disease. For patients with bipolar disorder, clinical trials for bipolar disorder may offer access to investigational therapies. This guide covers how to find bipolar trials, active research areas, eligibility considerations, and resources.
Categories of bipolar trials
Active bipolar trials in 2026 include:
Bipolar depression treatments: The depressive phase of bipolar disorder is the most common and disabling. Trials test novel agents specifically for bipolar depression, including caplyta-class agents, novel mechanisms, and combinations.
Mania and mixed episode treatments: New atypical antipsychotics and other mood stabilizers.
Maintenance therapy: Trials testing approaches to prevent relapse in stabilized patients.
Treatment-resistant bipolar depression: Ketamine-class agents, neuromodulation, novel mechanisms for treatment-resistant disease.
Lithium optimization: Refined dosing, monitoring, and addressing lithium tolerability concerns.
Where to find bipolar trials
Resources:
- ClinicalTrials.gov
- Depression and Bipolar Support Alliance (DBSA)
- NAMI
- Major academic psychiatry programs
- NIMH research initiatives
Phase-specific trial considerations
Bipolar trials are typically phase-specific:
Bipolar depression trials: Most active research area. Trials enroll patients in current depressive episode.
Mania trials: Patients in current manic or mixed episode. Often inpatient trials given clinical needs.
Maintenance trials: Stabilized patients followed for relapse prevention.
Typical eligibility for bipolar trials
Common inclusion criteria:
- Bipolar I or II diagnosis meeting DSM-5 criteria
- Current episode meeting trial requirements (depression, mania, mixed)
- Severity scores in specific range
- Stable medications for specified period
Common exclusion criteria:
- Active psychosis with severe features
- Severe substance use disorder
- Active suicidality
- Other major medical conditions
- Pregnancy
Frequently Asked Questions
Are bipolar I and II trials separate?
Often yes. Bipolar I trials require history of manic episodes; bipolar II trials require hypomanic episodes only. Some trials enroll both types.
Can I continue lithium during a trial?
Depends on the trial design. Some require washout; others test add-on therapies on stable mood stabilizers.
Are ketamine trials available for bipolar depression?
Yes, with specific protocols given the unique considerations of bipolar disorder (mania risk).
How long do bipolar trials typically last?
Acute episode trials are 2-12 weeks; maintenance trials run 6-24 months.
What if my diagnosis is uncertain?
Trials require confirmed bipolar diagnosis. Patients with diagnostic uncertainty may need additional evaluation before trial enrollment.
The bottom line on bipolar trials
Bipolar research focuses primarily on bipolar depression treatments and treatment-resistant disease. Major academic psychiatry programs and DBSA provide resources. Discuss with your psychiatrist as part of treatment planning.