Disease Areas

Alzheimer’s Disease

Alzheimer’s Disease

Alzheimer’s disease, the most common form of dementia, is a progressive neurological illness that impairs thinking and the independence of millions of people worldwide. Today more than 55M people have dementia worldwide, with 60-70% of cases being Alzheimer’s disease.1

Alzheimer’s disease is usually diagnosed in people 65 years and older, but it starts earlier, with subtle neurological changes occurring years or even decades before symptoms appear. Many people are experiencing the early, often unrecognized signs of mild cognitive impairment.

Our Approach

Driven by our commitment to patients and our strong business foundation, Biogen remains dedicated to furthering Alzheimer’s disease research and treatment, aiming to help address the unmet needs in this devastating condition, with an emphasis on early-stage disease.

Innovative Research

We understand how incredibly challenging it is to treat this complex condition, which is why we will never stop innovating for patients, families and providers in the Alzheimer’s community. We are currently conducting clinical trials to evaluate the efficacy and safety of investigational therapies in our pipeline, including Alzheimer’s disease.



Alzheimer's Disease

Michael's Story – Living with Alzheimer's Disease


Alzheimer's Disease

One day at a time: Kamaria’s story


Alzheimer's Disease

A new era in Alzheimer’s disease: 3 things to know

Living with Alzheimer’s disease: Barry’s story

Barry was 61 years old when he was diagnosed with Alzheimer’s disease. He and his husband, Randy, had recently moved to an idyllic new town on Cape Cod, excited to start a new chapter in their lives. The diagnosis meant that he not only had to give up his job, but also his plans for the future. Worried about the loss of awareness of himself and his life that would ultimately come, Barry prepared his will, and visited assisted living facilities. Making these decisions now gives him a sense of comfort that he is still in control of his own life.

Understanding Alzheimer’s Disease

As they get older, many people may notice changes in memory and thinking abilities. At first, these changes may be so subtle that they’re easy to explain as normal aging — and they may be. However, it’s also possible that they’re the earliest symptoms of Alzheimer’s disease.

Resources for People Living With Alzheimer’s Disease

Clinical Trials

Deciding to participate in a clinical trial requires careful consideration. In most cases, the therapies investigated in clinical trials are not yet approved by regulatory agencies like the Food and Drug Administration (FDA) in the United States. The benefits and risks of taking the treatment are not completely known. By volunteering for a clinical trial, you are helping the medical community determine whether new treatments are safe and effective.

Learn more about clinical trials

View all recruiting Alzheimer’s disease clinical trials

For additional questions, contact our Patient Center at patientcenter@biogen.com

Commitment to Health Equity

Biogen has signed agreements with the National Association of Free and Charitable Clinics (NAFC), which is focused on addressing health disparities and access. NAFC has a large network of clinics across the country, with teams that will provide appropriate information and education about Alzheimer’s disease and support cognitive screening.

Biogen’s commitment to health equity is rooted in efforts focused on providing culturally competent resources and care, offering cognitive testing, engaging with community health centers and, when possible, mitigating out-of-pocket costs for patients and families.

Facts and Figures


Alzheimer's disease is the most common cause of dementia, accounting for an estimated 60–70% of cases worldwide.1

1 in 3

1 in 3 seniors dies with Alzheimer's or another dementia.2.  





More than 80% of Americans know little or are not familiar with mild cognitive impairment (MCI), which can be an early stage of Alzheimer’s.1


1. World Health Organization, “Dementia.” Dementia, World Health Organization, 2023, https://www.who.int/news-room/fact-sheets/detail/dementia .

2. Alzheimer's Association, “2023 Alzheimer’s Disease Facts and Figures Report – At a Glance Statistics.” 2022 Alzheimer’s Disease Facts and Figures Report – At a Glance Statistics, Alzheimer's Association, 2023, https://alz.org/media/Documents/Facts-And-Figures-2023-At-A-Glance-Stats-Fact-Sheet.pdf.  

3. Alzheimer’s Association, “Mild Cognitive Impairment (MCI).” Mild Cognitive Impairment (MCI), Alzheimer’s Association, 2023, https://www.alz.org/alzheimers-dementia/what-is-dementia/related_conditions/mild-cognitive-impairment.