Clinical trial Recruiting at 1 site Phase 3 Interventional Ages 18 to 65

Adding lacosamide to treatment for major depressive episodes in bipolar I and II

Official title: Evaluation of the Efficacy, Safety, and Tolerability of Lacosamide in Major Depressive Episodes of Bipolar Disorder Types I and II: a Randomized, Controlled, Double-blind, Parallel-group Clinical Trial.

Run by University of Sao Paulo · NCT07412132 · Data updated 2026-11-12

This trial will test whether adding lacosamide to a person's current medication helps reduce depressive symptoms in adults with treatment-resistant bipolar I or II depression.

More Bipolar Affective Disorder trials

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years to 65 Years
SexAll
Enrollment40 (estimated)
SponsorUniversity of Sao Paulo
Academic / other
Locations1 site (São Paulo, São Paulo)
StatusRecruiting
StartedJanuary 9, 2026
Main results expectedJanuary 2027
Study endsJanuary 2027
Registry record updatedFebruary 20, 2026
Trial IDNCT07412132 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults with bipolar disorder type I or II who are currently in a moderate to severe major depressive episode and have failed at least two adequate pharmacological treatments in the current episode are ideal candidates.

Probably not a fit

People with acute suicidal ideation, psychotic depression, pregnancy, severe unstable medical illness, current schizophrenia/dementia, or a prior non-response to adequate electroconvulsive therapy are unlikely to be eligible or to benefit from this treatment option.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This is a double-blind, randomized, parallel-group Phase 3 augmentation trial comparing lacosamide versus placebo in adults with moderate to severe major depressive episodes of bipolar I or II who have not responded to at least two adequate treatments during the current episode. Participants will continue their first- or second-line medications while receiving either lacosamide or placebo and will be followed for changes in depressive symptoms and adverse events. The primary outcome is reduction in depression rating scale scores; safety and tolerability will be monitored and compared between groups. The trial is conducted at the Instituto de Psiquiatria (IPQ) in São Paulo, Brazil.

Why it matters

Potential benefit: If effective, adding lacosamide could reduce depressive symptoms for people with treatment-resistant bipolar depression when used alongside their existing medications.

How similar studies have gone: Preliminary observational and open-label reports have suggested potential benefit of lacosamide for mood symptoms, but randomized controlled evidence is limited and this approach remains relatively novel.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. Diagnosis of bipolar disorder (type I or II) confirmed by structured clinical interview;
2. acute major depressive episode of moderate or severe intensity;
3. no response to at least two adequate pharmacological interventions to treat the current episode.

Exclusion Criteria:

1. Current diagnosis of schizophrenia, dementia, intellectual disability, organic mental disorder (by clinical assessment). Comorbidity with other psychiatric disorders (personality disorders, anxiety disorders, substance use disorders, eating disorders, and attention deficit disorder) will be permitted provided the primary diagnosis is bipolar disorder;
2. acute suicidal ideation (defined by HAMD-17 item 3 ≥ 3 points or by clinical assessment);
3. current depressive episode with psychotic features (by clinical assessment);
4. suspected or confirmed pregnancy;
5. severe or unstable clinical illnesses;
6. previous history of non-response to an adequate course of at least 8 sessions of electroconvulsive therapy;
7. previous history of non-response to an adequate course of ketamine treatment.

Where it's running

  • Instituto de Psiquiatia (IPQ)
    São Paulo, São Paulo, Brazil
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.