Memory Digest

Joining a Clinical Trial

How dementia clinical trials work, who can join, what to ask, and how to find a study near you.

Last reviewed: October 2026

Every treatment we have today—including the newest Alzheimer's drugs—exists because volunteers took part in research. Yet studies often struggle to find enough participants, which slows progress. Whether you have a diagnosis, are a caregiver, or are healthy, there may be a study that needs you.

What is a clinical trial?

A clinical trial tests whether a treatment or approach is safe and effective in people. Other research studies (sometimes called observational studies) don't test a treatment but follow people over time—through memory tests, scans or blood samples—to learn how diseases develop.

Trials for new drugs move through phases:

• Phase 1 – small studies testing safety and dosing.
• Phase 2 – larger studies looking at safety and early signs of benefit.
• Phase 3 – large studies, often with hundreds or thousands of people, comparing the treatment with a placebo or standard care. Results are used for FDA approval.
• Phase 4 – studies after approval to learn more about long-term use.

Many trials are randomized (participants are assigned by chance to the treatment or a comparison group) and blinded (participants and often the researchers don't know who gets what). This is how scientists know a result is real.

Who can join?

Each study has eligibility criteria—age, stage of disease, other health conditions, medicines, and sometimes biomarker results. Dementia research needs:

• People with mild cognitive impairment or dementia
• People with a family history or genetic risk
• Healthy volunteers, especially for prevention studies
• Caregivers, for studies of support programs
• People from diverse backgrounds, who have historically been underrepresented. Treatments need to be tested in everyone they're meant to help.

Many studies require a study partner—a family member or friend who knows the participant well and can come to some visits.

Possible benefits

• Access to new treatments before they're widely available
• Close monitoring and expert care from research teams
• Learning more about your own health
• Contributing to knowledge that helps future generations

Possible risks and downsides

• The treatment may not work, or you may be in the placebo group.
• Side effects, some unknown, are possible.
• Visits, scans, blood draws or spinal taps take time and can be uncomfortable.
• Some studies last years.

Your protections

• Informed consent – before joining, the team must explain the study's purpose, procedures, risks and benefits, and answer your questions. You'll sign a consent form. If a person can't fully consent, a legally authorized representative may help decide, with the person's agreement.
• Ethics oversight – an Institutional Review Board (IRB) reviews and monitors studies to protect participants.
• You can leave at any time, for any reason, without affecting your regular care.
• Participation is generally free; some studies pay for travel or time.

Questions to ask

• What is the study trying to find out? What phase is it?
• What will I be asked to do, and how often? How long does it last?
• What are the possible risks and benefits?
• Is there a placebo? Will I have access to the treatment after the study?
• Will it cost me anything? Is travel covered?
• Who will see my information, and will I get my results?
• Can I keep my own doctor and current medicines?

How to find a study

• ClinicalTrials.gov – the official U.S. database of studies worldwide. Search by condition and location.
• Alzheimers.gov – NIA's portal for finding Alzheimer's and dementia studies.
• Alzheimer's Association TrialMatch – a free matching service; call 800-272-3900.
• Alzheimer's Disease Research Centers (ADRCs) – NIA-funded centers at major universities run many studies and also welcome healthy volunteers.
• Registries – such as the Alzheimer's Prevention Registry and Brain Health Registry, which notify you about studies you may fit.
• Ask your doctor or memory clinic.

Other ways to help research

• Joining a long-term observational study or registry
• Brain donation after death, which helps scientists study the diseases directly; families can arrange this in advance through research centers
• Taking part in caregiver studies

Research is how we got here—and how we'll get further. See Dementia Treatments: An Overview for where treatment stands today.

Sources

1. National Institute on Aging: Clinical Trials and Studies
2. ClinicalTrials.gov (U.S. National Library of Medicine)
3. Alzheimer's Association TrialMatch
4. Alzheimers.gov: Find a Clinical Trial

Not medical advice. This article is general information, not a diagnosis or treatment plan for any individual. Talk with a doctor about your situation.

Related articles

• Dementia Treatments: An Overview
• Alzheimer's Disease
• Mild Cognitive Impairment (MCI)