Clinical trials · California
Down Syndrome clinical trials in California
We’re tracking 263 recruiting down syndrome studies with a site in California — including Phase 1, Phase 1/Phase 2, Phase 2, Phase 2/Phase 3, Phase 3 and Phase 4 studies, each written for real people, not researchers.
Recruiting studies in California
- NCT05204459Recruiting
MRI and eye-scan study for MS and related conditions
This trial uses brain MRI and eye imaging tests to study research markers in people with multiple sclerosis (MS) and related neurologic conditions. It may help researchers better understand these diseases and how they change over time.
Los Angeles, CaliforniaAges 18 years+ - NCT04243785RecruitingPhase 1
Testing BTX-A51 for hard-to-treat AML or high-risk MDS
This Phase 1 study tests BTX-A51 in adults with relapsed or refractory acute myeloid leukemia (AML) or high-risk myelodysplastic syndrome (MDS). It’s designed to see if the treatment can be given safely and to learn how it works in people whose standard treatments have not helped or are no longer an option.
Duarte, CaliforniaAges 18 years+ - NCT06393101RecruitingPhase 1
High-CBD cannabis extract for complex regional pain syndrome treatment
This study tests a high-CBD cannabis extract (BRC-002) to see if it can help reduce pain and improve health in people with Complex Regional Pain Syndrome (CRPS). Participants will not use opioids or other cannabis during the study.
La Jolla, CaliforniaAges 21–75 - NCT07742735RecruitingPhase 3
Study of apraglutide for short bowel syndrome with intestinal failure
This study tests a new medicine called apraglutide, given as a shot, to see if it can help adults with short bowel syndrome and intestinal failure reduce their need for intravenous nutrition (parenteral support). The study compares apraglutide to a placebo (a shot with no medicine) to check if it is safe and effective.
Los Angeles, CaliforniaAges 18 years+ - NCT07727538RecruitingPhase 3
Olezarsen for familial chylomicronemia syndrome in children and teens
This study tests a new medicine called olezarsen to lower very high triglycerides (fats) in the blood of children and teenagers with familial chylomicronemia syndrome (FCS), a rare genetic condition. The goal is to reduce the risk of pancreatitis and other complications.
San Francisco, CaliforniaAges 2–17 - NCT07675109Recruiting
Extended therapy for restless legs syndrome
This study tests a device that delivers nerve stimulation to help with restless legs syndrome (RLS). It aims to see if using the device for a longer period each night can reduce RLS symptoms and improve sleep.
Pleasanton, CaliforniaAges 21 years+ - NCT06690801Recruiting
Nitric oxide breathing gas for children with lung failure
This trial tests whether adding a breathing gas called nitric oxide to standard care helps children with severe lung failure (ARDS) recover faster. It is for children on a breathing machine who still have low oxygen levels.
Los Angeles, CaliforniaAges birth–21 years - NCT07625579Recruiting
Collaboration for Down Syndrome Progress Research Study
This research study aims to better understand Down syndrome by collecting health information, family history, and sometimes brain imaging or sleep data from children and adults with Down syndrome and their families. The goal is to advance knowledge that could improve health and development for people with Down syndrome.
Orange, CaliforniaAges Any age - NCT06481176Recruiting
How exercise affects blood in restless legs syndrome
This trial studies how a single session of exercise changes blood markers in people with restless legs syndrome (RLS) who are not currently being treated. If you have moderate to severe RLS and are not regularly active, this study may help us understand how exercise affects your condition.
Stanford, CaliforniaAges 18 years+ - NCT07605429RecruitingPhase 3
Rugonersen treatment for Angelman syndrome
This study tests a new medicine called rugonersen for people with Angelman syndrome. The medicine is given as an injection into the fluid around the spinal cord and may help improve symptoms by targeting the genetic cause of the condition.
San Diego, CaliforniaAges 1–50 - NCT07593391RecruitingPhase 3
NNZ-2591 Treatment for Children with Phelan-McDermid Syndrome
This study tests whether a medication called NNZ-2591 can help children with Phelan-McDermid syndrome, a rare genetic condition that affects brain development and learning. Researchers want to see if this drug can improve how children with this condition develop and learn.
Glendale, CaliforniaAges 3–12 - NCT07545759RecruitingPhase 2
Testing brenipatide for IBS with diarrhea symptoms
This study tests whether a new medication called brenipatide can help people with IBS-diarrhea (IBS-D) reduce belly pain and loose stools. IBS-D is a condition where the intestines move too quickly, causing frequent diarrhea and discomfort.
Anaheim, CaliforniaAges 18–75 - NCT07545772RecruitingPhase 2
Testing Brenipatide for Constipation-Focused IBS
This trial tests a new medicine called brenipatide to see if it can help people with IBS-C (irritable bowel syndrome with constipation). The study focuses on whether the drug reduces belly pain and improves bowel movements in people whose main symptom is hard or infrequent stools.
Anaheim, CaliforniaAges 18–75 - NCT07538583RecruitingPhase 2/Phase 3
QRX003 Lotion for Netherton Syndrome
This study tests a new lotion (QRX003) designed to treat Netherton Syndrome, a rare genetic skin condition. The lotion is applied to affected skin areas to see if it can reduce symptoms and improve skin health.
Fremont, CaliforniaAges 4 years+ - NCT07494162Recruiting
Acupuncture for chronic low back pain with muscle knots
This trial tests if acupuncture can help chronic low back pain by looking at changes in muscle metabolism and blood flow. It compares real acupuncture with a sham (fake) procedure to see if there is a true benefit.
Sacramento, CaliforniaAges 18 years+ - NCT07464639Enrolling by invitation
Comparing two ways to help shoulder pain with movement feedback
This study compares using ultrasound images (dynamic visual feedback) versus manual guidance to help activate shoulder blade muscles and improve space in the shoulder joint for people with shoulder pain when lifting their arm.
Long Beach, CaliforniaAges 18–70 - NCT07450664Enrolling by invitation
Observational study of VYKAT XR for Prader-Willi syndrome
This study follows people with Prader-Willi syndrome who are already taking or starting VYKAT XR, including those switching from an earlier version of the drug (DCCR). It aims to understand how the treatment works in everyday life.
Los Angeles, CaliforniaAges 4 years+ - NCT07422480RecruitingPhase 3
Comparing elritercept to epoetin alfa for anemia in MDS needing transfusions
This trial tests a new drug called elritercept against a standard treatment, epoetin alfa, for people with a low-risk form of MDS who need regular blood transfusions for anemia. The goal is to see if elritercept works better to reduce the need for transfusions.
Duarte, CaliforniaAges 18 years+ - NCT06196203RecruitingPhase 2
Study of AK117 with Azacitidine for High-Risk MDS
This trial tests a new drug, AK117, combined with azacitidine for people newly diagnosed with high-risk myelodysplastic syndromes (MDS), a blood disorder. The goal is to see if the combination can help improve outcomes.
Los Angeles, CaliforniaAges 18 years+ - NCT06851338Recruiting
Inspire therapy study for teens with Down syndrome and sleep apnea
This study tests a device called Inspire that stimulates the airway during sleep to treat obstructive sleep apnea in teenagers with Down syndrome who cannot use a CPAP machine or had a tonsillectomy that did not work well.
Orange, CaliforniaAges 13–18 - NCT07293546Enrolling by invitationPhase 1/Phase 2
Gene therapy trial for FOXG1 syndrome
This trial tests a gene therapy called FRF-001 for people with FOXG1 syndrome. It aims to see if the treatment is safe and can help improve symptoms.
Oakland, CaliforniaAges 2–20 - NCT07281079RecruitingPhase 3
Testing NNZ-2591 for children with Phelan-McDermid syndrome
This trial tests a new medicine, NNZ-2591, to see if it helps children with Phelan-McDermid syndrome. It is for children aged 3 to 12 who have a specific genetic change (SHANK3) and weigh at least 10 kg.
Glendale, CaliforniaAges 3–12 - NCT07280468RecruitingPhase 4
Personalized sleep apnea treatment for Down syndrome
This study tests if a treatment chosen based on your specific type of sleep apnea works better for people with Down syndrome. It looks for participants who have sleep apnea but are not already using a CPAP machine regularly.
San Diego, CaliforniaAges 6 years+ - NCT07277582RecruitingPhase 2/Phase 3
Study of a new medicine for long QT syndrome types 2 and 3
This study tests a new medicine called THRV-1268 to see if it can safely improve heart rhythm in people with Long QT syndrome types 2 and 3. It may help reduce the risk of dangerous heart rhythm problems.
San Francisco, CaliforniaAges 15 years+
Down Syndrome trials by city in California
Where these studies are running in California
Institutions with a site for the recruiting down syndrome studies listed above.
- Om Research LLC · 2 studies
- Smart Cures Clinical Research · 2 studies
- United Medical Doctors · 2 studies
- University of California San Diego · 2 studies
- Altman Clinical and Translational Research Institute
- Cancer & Blood Research Center
- Cedars-Sinai Medical Center
- Center for Dermatology Clinical Research
What taking part in a down syndrome 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.
Down Syndrome trials in other states
Common questions
- Are there down syndrome clinical trials in California?
- Yes. We're currently tracking 263 recruiting down syndrome 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 down syndrome 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 down syndrome 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 down syndrome 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.