Clinical trials · California
Major Depressive Disorder clinical trials in California
We’re tracking 66 recruiting major depressive disorder studies with a site in California — including Early Phase 1, Phase 1, Phase 2, Phase 3 and Phase 4 studies, each written for real people, not researchers.
Recruiting studies in California
- NCT06966401RecruitingPhase 3
Long-term safety study of a new depression treatment
This study tests a new oral medication (NBI-1065845) added to your current antidepressant to see if it's safe and tolerable over a long period for people with depression that hasn't fully responded to treatment.
Glendale, CaliforniaAges 18 years+ - NCT06963021RecruitingPhase 3
Study of NBI-1065845 for depression that hasn't fully responded to treatment
This trial tests an investigational drug called NBI-1065845 added to your current antidepressant. It is for people with moderate to severe depression or persistent depressive disorder who have not improved enough with oral antidepressants alone.
Chino, CaliforniaAges 18 years+ - NCT06938841Recruiting
Maintenance rTMS for depression
This study tests whether ongoing rTMS treatments can help people who already improved after an initial round of rTMS for depression. It aims to keep the benefits going and prevent relapse.
San Diego, CaliforniaAges 18–80 - NCT06911112RecruitingPhase 3
A new pill for depression when current treatment isn't working well enough
This trial tests an investigational medication (NBI-1065845) added to your current antidepressant to see if it can improve depressive symptoms. It is for people with moderate to severe depression who have not fully responded to their current antidepressant.
Glendale, CaliforniaAges 18 years+ - NCT06898879Recruiting
Working together to improve mental health care for veterans
This study is for veterans getting mental health support through VA programs. It tests a way to improve teamwork between veterans and their care teams to make the care better.
West Los Angeles, CaliforniaAges 18 years+ - NCT06830044RecruitingPhase 3
Adding an experimental drug for major depression
This trial tests if adding a new medicine called milsaperidone can help people with major depression who haven't gotten enough relief from their current antidepressant. It aims to see if the combination works better than the antidepressant alone.
Garden Grove, CaliforniaAges 18–65 - NCT06823024Enrolling by invitation
Using speech patterns to predict treatment response in depression, PTSD, or bipolar disorder
This study tests if a computer algorithm can analyze your speech to predict how well you will respond to treatments like TMS or Spravato. It aims to create a simple tool that helps doctors choose the right treatment for you.
Sunnyvale, CaliforniaAges 18–68 - NCT06793397RecruitingPhase 3
Study of an experimental psychedelic-like drug for depression (CYB003)
This study tests an investigational medication (CYB003) for people with major depression whose current antidepressant isn't working well enough. It looks at whether this treatment can help improve depression symptoms.
Glendale, CaliforniaAges 18–85 - NCT06786624RecruitingPhase 3
Testing a new drug for depression that hasn't fully responded to treatment
This trial tests a new medication called NBI-1065845 added to your current antidepressant for people with depression that hasn't fully responded to treatment. It aims to see if this combination can better improve your symptoms.
Garden Grove, CaliforniaAges 18 years+ - NCT06675240RecruitingPhase 1
Meditative neurofeedback for depression
This trial tests whether a technique that combines meditation with real-time brain activity feedback can help treat depression. It may help if you have moderate depression and are not currently struggling with substance abuse, psychosis, bipolar disorder, or suicidal behavior.
La Jolla, CaliforniaAges 18 years+ - NCT06633016RecruitingPhase 2
ABX-002 for major depression (add-on treatment)
This trial tests a new medication called ABX-002 as an add-on to your current antidepressant. It's for people with moderate to severe depression who haven't gotten enough help from their current antidepressant alone.
Anaheim, CaliforniaAges 18–65 - NCT06572683Enrolling by invitation
Novel TMS for hard-to-treat depression
This trial tests a new type of transcranial magnetic stimulation (TMS) for people with severe depression that hasn't improved with multiple medications or therapy. It uses a different frequency pattern to target brain circuits.
Los Angeles, CaliforniaAges 21–75 - NCT06580041Enrolling by invitationPhase 4
Precision treatment for major depression
This trial tests a personalized approach to treating major depressive disorder using assessments and brain imaging to match you with the best therapy. It aims to improve outcomes by tailoring care to your specific needs.
San Francisco, CaliforniaAges 18 years+ - NCT06559306RecruitingPhase 3
Seltorexant for depression with insomnia symptoms
This trial tests if adding seltorexant to your current antidepressant can improve depression and sleep problems. It is for people with major depressive disorder who still have symptoms, especially insomnia, despite trying at least one antidepressant.
Anaheim, CaliforniaAges 18–74 - NCT06547489RecruitingPhase 2
Testing zelquistinel for major depression
This study tests whether zelquistinel, an investigational drug, can reduce symptoms of major depressive disorder (a type of clinical depression). It is for people who are currently experiencing a moderate to severe depressive episode and are not taking other antidepressants.
Encino, CaliforniaAges 18–64 - NCT06512324Enrolling by invitation
TMS with remote viewing for depression and anxiety
This trial tests whether adding 'remote viewing' (a technique where a person tries to perceive a distant target) to standard TMS brain stimulation can improve depression and anxiety symptoms. It is for people already getting TMS and who can attend weekly visits.
Encinitas, CaliforniaAges 12 years+ - NCT06376734RecruitingPhase 2
TMS for depression, anxiety, OCD, or schizophrenia
This study tests whether a brain stimulation technique called TMS can help people with depression, anxiety, OCD, or schizophrenia. It aims to find better ways to target the treatment for each person's specific needs.
Sunnyvale, CaliforniaAges 18–65 - NCT06345859RecruitingPhase 2
Brain and emotion study for young adults with or without depression history
This study looks at how the brain regulates mood and body signals in young adults ages 18-27. It includes people who have had depression in the past but are now well, as well as healthy volunteers with no psychiatric history.
Los Angeles, CaliforniaAges 18–27 - NCT06002100Enrolling by invitation
Predicting depression treatment response with brain imaging
This study uses a special headband (TD-fNIRS) that measures brain activity to see if it can predict how well different depression treatments work. You would be starting a new treatment for depression (like ketamine, SPRAVATO, TMS, or antidepressants) and wear the headband before and during treatment.
Costa Mesa, CaliforniaAges 18–75 - NCT05850689RecruitingPhase 3
Lumateperone add-on for major depression that didn’t improve
This study tests whether adding lumateperone to an antidepressant helps adults with major depressive disorder (MDD) who haven’t improved enough after trying at least two different antidepressants. It may help reduce depressive symptoms more than antidepressants alone.
Pico Rivera, CaliforniaAges 18–65 - NCT05598034Recruiting
Brain stimulation with tDCS for moderate depression
This study tests whether a noninvasive brain stimulation called tDCS can improve depression symptoms. It also uses MRI scans, aiming to understand how brain changes may relate to symptom improvement.
Los Angeles, CaliforniaAges 20–55 - NCT04870255Recruiting
Brain stimulation for depression in borderline personality disorder
This study tests a type of brain stimulation called rTMS to see if it can help improve mood in people who have both depression and borderline personality disorder. It may offer a new treatment option for those who haven't tried TMS before.
Stanford, CaliforniaAges 18–80 - NCT04556890Recruiting
Brain stimulation for treatment-resistant depression and chronic pain
This study tests a non-invasive brain stimulation treatment, called transcranial magnetic stimulation (TMS), to see if it can help people who have both major depression that hasn't improved with medication and chronic pain from fibromyalgia or chronic fatigue syndrome. It aims to reduce both depression and pain symptoms.
Los Angeles, CaliforniaAges 18–75 - NCT04509102Enrolling by invitationEarly Phase 1
Test added stimulant medicine with rTMS for depression
This early study tests whether adding a stimulant medicine to repetitive TMS (a non-drug brain stimulation) can improve depression. It is aimed at people whose depression has not improved after at least two antidepressant tries.
Los Angeles, CaliforniaAges 18–65
Major Depressive Disorder trials by city in California
Where these studies are running in California
Institutions with a site for the recruiting major depressive disorder studies listed above.
- Neurocrine Clinical Site · 4 studies
- Acacia Clinics · 3 studies
- CalNeuro Research Group · 2 studies
- Anderson Clinical Research
- ATP Clinical Research
- Autobahn Site #106
- Autobahn Site #113
- Autobahn Site #117
What taking part in a major depressive disorder study involves
A screening visit first
Before anything else, the study team checks whether you fit — usually a visit with some tests. You can stop at any point, and screening is typically free.
Care at a nearby site
Study visits happen at a clinic or hospital taking part. Many studies cover the cost of the study treatment and related visits, and some reimburse travel.
You stay in control
Taking part is voluntary and you can leave a study at any time, for any reason, without affecting your regular care.
The team decides eligibility
Our fit check is a helpful first read, not a decision. The study team makes the final call after reviewing your health history.
Major Depressive Disorder trials in other states
Common questions
- Are there major depressive disorder clinical trials in California?
- Yes. We're currently tracking 66 recruiting major depressive disorder studies with a site in California, each rewritten in plain language so you can see what it's testing and who it's for.
- How do I find out if I qualify for a major depressive disorder study in California?
- Each study lists its eligibility rules — age, diagnosis, prior treatments. On every trial page we explain these in plain language and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Do I have to live in California to take part?
- Not necessarily. These studies have a site in California, but eligibility is about your health, not your address — some people travel to take part, and a few studies reimburse travel. The study team can tell you what's required.
- Does it cost anything to join a major depressive disorder trial?
- Using Clin2 is always free. Many trials cover the study treatment and related visits; some reimburse travel. The study team explains exactly what's covered before you decide.
Not the right time?
New major depressive disorder studies open in California regularly. Set up a health profile and we’ll quietly watch for studies that fit you and email you when one opens.
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.