Clinical trials · California
Parkinson’s disease clinical trials in California
We’re tracking 51 recruiting parkinson’s disease studies with a site in California — including Phase 1, Phase 1/Phase 2, Phase 2 and Phase 4 studies, each written for real people, not researchers.
Recruiting studies in California
- NCT07142044RecruitingPhase 1/Phase 2
Testing EC5026 for Parkinson's disease
This study tests a new oral medication called EC5026 for Parkinson's disease. It aims to see if the drug is safe and if it might help control symptoms when added to your current levodopa treatment.
Sacramento, CaliforniaAges 50–80 - NCT06285643RecruitingPhase 2
Gene therapy for moderate Parkinson's disease
This trial tests a gene therapy (AAV2-GDNF) to see if it can slow or improve symptoms of Parkinson's disease. It is for people who have had moderate Parkinson's for 4 to 10 years and still respond to levodopa therapy.
San Francisco, CaliforniaAges 45–75 - NCT06482268RecruitingPhase 1
Cell transplant for advanced parkinson's disease
This trial tests a new type of cell transplant for Parkinson's disease. The cells are made from stem cells and are meant to replace damaged brain cells that produce dopamine, which may improve your motor symptoms.
La Jolla, CaliforniaAges 40–75 - NCT07432958RecruitingPhase 2
Study of AP-472 with levodopa for Parkinson's motor fluctuations
This trial tests an experimental drug called AP-472, taken alongside your regular Parkinson's medications, to see if it can reduce the amount of "OFF" time you experience each day when symptoms return between doses of levodopa.
Carlsbad, CaliforniaAges 30–80 - NCT05307055Recruiting
Testing brain effects after low-frequency stimulation in Parkinson’s
This study looks at how Parkinson’s disease symptoms and brain thinking (neurocognitive function) may change after low-frequency stimulation from an implanted brain device. It may help researchers understand whether this specific stimulation pattern could improve thinking or brain-related symptoms.
Los Angeles, CaliforniaAges 18 years+ - NCT07330258Recruiting
Observing Parkinson's over time in people still having movement symptoms
This study follows people with Parkinson's disease who still have movement symptoms despite taking medication. It aims to understand how the disease changes over time, which could help improve future treatments.
Fountain Valley, CaliforniaAges 45–75 - NCT05897957Enrolling by invitation
Follow-up study for people who received BRT-DA01
This study is for people with Parkinson’s disease who previously took part in an earlier BRT-DA01 trial and finished it (or stopped it). It mainly checks how participants do over time after that earlier treatment.
Orange, CaliforniaAges 50–78 - NCT07092995Enrolling by invitation
Understanding freezing of gait in Parkinson's using VR and brain signals
This study uses virtual reality and brain recordings from your DBS device to understand why some people with Parkinson's experience freezing of gait (feeling like your feet are stuck to the ground). You'll be asked to walk in a safe VR environment while researchers monitor your brain activity.
Los Angeles, CaliforniaAges 18 years+ - NCT05395624RecruitingPhase 1/Phase 2
Safety imaging study of a PET tracer in ALS, Alzheimer, MS, Parkinson
This early-phase study tests the safety of a radioactive tracer (“18F-OP-801”) and how the tracer moves through the body (biodistribution) in people with ALS, Alzheimer’s disease, multiple sclerosis, Parkinson’s disease, and in healthy volunteers. It also measures how the body processes the tracer (“pharmacokinetics”) to support future studies.
San Francisco, CaliforniaAges 18–80 - NCT03623672Enrolling by invitation
Study for early signs of Parkinson-related brain changes
This study enrolls people with idiopathic REM sleep behavior disorder, a sleep problem that can come before Parkinson’s disease or related conditions. It aims to better understand early (“prodromal”) changes so future treatments can be targeted earlier.
Redwood City, CaliforniaAges 18 years+ - NCT07081841Enrolling by invitation
Long-term follow-up for AB-1005 study participants
This trial is for people with Parkinson's disease or multiple system atrophy (parkinsonian type) who took part in an earlier AB-1005 study. It will continue to monitor your health over time to learn more about the treatment's long-term effects.
San Francisco, CaliforniaAges Any age - NCT05065060Recruiting
Parkinson study tracking health online and long-term
This study aims to better understand Parkinson’s disease over time by collecting health information online. You may join if you have Parkinson’s, or if you don’t, to compare changes and help researchers find useful markers.
San Francisco, CaliforniaAges 18 years+ - NCT04373317RecruitingPhase 4
Comparing two medicines for hallucinations in Parkinson's disease
This study compares two drugs, pimavanserin and quetiapine, to see which works better for hallucinations or delusions caused by Parkinson's disease. The goal is to help patients manage these symptoms more effectively.
Loma Linda, CaliforniaAges 40 years+ - NCT04477785Recruiting
Study to track Parkinson’s signs using imaging, spinal fluid, and genes
This study is building a large, detailed group of people—some with Parkinson’s and some at higher risk—to understand early changes over time. It uses brain imaging (DaTscan SPECT), sometimes spinal fluid tests (lumbar puncture), and genetic information to help researchers better measure disease and develop future treatments.
La Jolla, CaliforniaAges 30 years+ - NCT05065151Recruiting
Studying motivation in Parkinson’s using brain stimulation recordings
This study looks at what drives motivation in people with Parkinson’s disease (or dystonia) by using recordings from an implanted brain stimulation device. It may help researchers understand brain signals behind motivation and improve future treatments.
San Francisco, CaliforniaAges 18 years+ - NCT06583395Enrolling by invitation
Meditation retreat study with fitness tracker
This trial studies people attending a 7-day meditation retreat to see how meditation affects well-being. You will wear a fitness tracker and answer surveys.
Palm Desert, CaliforniaAges 21 years+ - NCT05400174Recruiting
How blood pressure changes affect thinking and brain flow in Parkinson’s
This study measures how your blood pressure affects thinking skills and how blood flows in the brain in people with Parkinson’s. It may help researchers understand what blood-pressure changes could mean for cognition in Parkinson’s.
San Diego, CaliforniaAges 50 years+ - NCT03664609Recruiting
Study of outcomes for people with deep brain stimulation
This study looks back at results for people who have already had deep brain stimulation (DBS) or could get it. It aims to understand how DBS is used and what outcomes people experience.
San Francisco, CaliforniaAges Any age - NCT04071847Recruiting
Study tracking results after Abbott deep brain stimulator surgery
This study follows people who are getting a new Abbott deep brain stimulator (DBS) device or replacing the battery/implantable pulse generator to see how outcomes change over time. It mainly applies to certain DBS targets and diagnoses, and it uses follow-up visits to track results.
Sacramento, CaliforniaAges Any age - NCT05292794Recruiting
CereGate therapy for freezing of gait in Parkinson’s
This trial tests whether CereGate therapy can reduce “freezing of gait,” a walking problem, in people with Parkinson’s disease who already have deep brain stimulation (DBS). If you meet the device and medication stability requirements, the study may help your walking and movement symptoms measured during testing.
Redwood City, CaliforniaAges 21–80 - NCT07219927Recruiting
Patient experiences with pump-delivered Parkinson's drug
This study looks at real-world experiences of people with Parkinson's who are using ONAPGO, a medication given continuously under the skin through a pump. The goal is to understand how this treatment works in daily life.
Irvine, CaliforniaAges 18 years+ - NCT05919160Enrolling by invitation
New tiny electrode to record brain activity during DBS
This study tests a high-density microelectrode that captures detailed brain recordings while surgeons place a deep brain stimulator for Parkinson’s disease. It may help doctors better locate the exact brain area to target during surgery.
Los Angeles, CaliforniaAges 18 years+ - NCT05826457Enrolling by invitation
Study for early RBD as a possible Parkinson’s risk
This study looks at people with REM sleep behavior disorder (RBD), confirmed by a sleep test, who may be in the early “prodromal” stage before Parkinson’s or related diseases. It also enrolls healthy controls to compare results from brain and body testing to better understand who is at risk.
Los Angeles, CaliforniaAges 18 years+ - NCT02071134Recruiting
Registry study for Vercise deep brain stimulation patients
This study keeps a record of people who receive the Vercise deep brain stimulation system. It helps doctors learn how the treatment is used in real-world care and how patients do over time.
Aliso Viejo, CaliforniaAges 18 years+
Parkinson’s disease trials by city in California
Where these studies are running in California
Institutions with a site for the recruiting parkinson’s disease studies listed above.
- University of California, San Francisco · 5 studies
- Cedars-Sinai Medical Center · 3 studies
- Stanford University · 3 studies
- University of California, Los Angeles (UCLA) · 3 studies
- Keck Medicine of USC · 2 studies
- Parkinson's Research Centers of America · 2 studies
- University of California San Diego Health · 2 studies
- University of California, Davis Medical Center · 2 studies
What taking part in a parkinson’s disease 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.
Parkinson’s disease trials in other states
Common questions
- Are there parkinson’s disease clinical trials in California?
- Yes. We're currently tracking 51 recruiting parkinson’s disease 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 parkinson’s disease 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 parkinson’s disease 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 parkinson’s disease 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.