Clinical trial No longer in our active list Phase 3 Interventional Ages 65 to 80

Evaluating donanemab for preclinical Alzheimer's Disease

Official title: A Study of Donanemab Versus Placebo in Participants at Risk for Cognitive and Functional Decline of Alzheimer's Disease

Run by Eli Lilly and Company · NCT05026866 · Data updated 2026-05-14

This study is no longer in our active list. It may have stopped recruiting or finished. The details below are as of 2026-05-14 and are kept for reference. Check ClinicalTrials.gov for its current status, or see similar studies below.

This study is testing if a new medication called donanemab can help people with early signs of Alzheimer's Disease feel better and stay healthy compared to a placebo.

Quick facts

PhasePhase 3
Study typeInterventional
Ages65 Years to 80 Years
SexAll
Enrollment2996 (estimated)
SponsorEli Lilly and Company
Industry-sponsored
Drugs / interventionsimmunotherapy, donanemab
Locations216 sites (Birmingham, Alabama and 215 other locations)
Trial IDNCT05026866 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are individuals with preclinical Alzheimer's Disease who show specific cognitive and biomarker indicators.

Probably not a fit

Patients with advanced Alzheimer's Disease or those without the required cognitive and biomarker criteria may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This study aims to assess the safety and efficacy of donanemab in individuals with preclinical Alzheimer's Disease. Approximately 800 participants will be enrolled to evaluate a different titration regimen over a 12-month period. Participants will undergo cognitive assessments and must have specific biomarkers indicating early Alzheimer's pathology. The study will compare the effects of donanemab against a placebo.

Why it matters

Potential benefit: If successful, this treatment could slow the progression of Alzheimer's Disease in its early stages.

How similar studies have gone: Other studies targeting early Alzheimer's Disease with similar approaches have shown promising results, suggesting potential for success.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* A Telephone Interview for Cognitive Status - modified (TICS-M) score reflective of intact cognitive functioning.
* Has a phosphorylated tau (P-tau) result consistent with the presence of amyloid and early-tau pathology.
* Has a reliable study partner and backup study partner familiar with overall function and behavior, such as day-to-day activities and cognitive abilities.
* Have adequate literacy, vision, and hearing for neuropsychological testing at screening.
* Contraceptive use by men or women should be consistent with local regulations regarding the methods of contraception for those participating in clinical studies
* Female participants include those who are infertile due to surgical sterilization (hysterectomy, bilateral oophorectomy, or tubal ligation), congenital anomaly such as Mullerian agenesis; or post menopausal (women 55 or older not on hormone therapy and had at least 12 months of spontaneous amenorrhea; or with a diagnosis of menopause prior to starting hormone replacement therapy.

Exclusion Criteria:

* Mild cognitive impairment or dementia, or significant other neurodegenerative disease that can affect cognition.
* Current serious or unstable illnesses including cardiovascular, hepatic, renal, gastroenterologic, respiratory, endocrinologic, neurologic, psychiatric, immunologic, or hematologic disease that could interfere with the analysis of the study or a life expectancy of approximately ≤5 years.
* History of cancer with high risk of recurrence and preventing completion of the trial.
* History of clinically significant multiple or severe drug allergies, or severe posttreatment hypersensitivity reactions (including but not limited to erythema multiforme major, linear immunoglobulin A dermatosis, toxic epidermal necrolysis, and/or exfoliative dermatitis).
* Have any clinically important abnormality at screening on magnetic resonance imaging (MRI) or clinical laboratory test results that could be detrimental to the participant or study integrity.
* Have any contraindications for MRI, including claustrophobia or the presence of contraindicated metal (ferromagnetic) implants/cardiac pacemaker.
* Have a centrally read MRI demonstrating presence of amyloid-related imaging abnormalities (ARIA-E), \>4 cerebral microhemorrhages, more than 1 area of superficial siderosis, any macrohemorrhage or severe white matter disease at screening.
* Have had prior treatment with a passive anti-amyloid immunotherapy \<5 half-lives prior to randomization.
* Have received active immunization against amyloid beta (Aβ) in any other study.
* Have received active immunization against Aβ in any other study.
* Current or previous use of prescription medications used as treatment for mild cognitive impairment (MCI) or AD.

Addendum 7 Exclusion Criteria for Clinicaltrials.gov:

* Same as the main study except contraindications for florbetapir F 18 PET are exclusionary.

Where it's running

  • Care Access - 801 South Power Road, Mesa
    Mesa, Arizona, United States
    Recruiting
  • Banner Alzheimer's Institute
    Phoenix, Arizona, United States
    Recruiting
  • Banner Alzheimer's Institute Tucson
    Tucson, Arizona, United States
    Recruiting
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    Huntington Beach, California, United States
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    Long Beach, California, United States
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+166 more sites. See ClinicalTrials.gov for the full list.

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.