study started
estimated completion



The study evaluates the effects of Prazosin on agitation in adults with Alzheimer's disease. Two thirds of the participants will participate in the medication portion, while one third will participate in the placebo portion

Official Title

Prazosin for Disruptive Agitation in Alzheimer's Disease (AD) (PEACE-AD)


Prazosin for Disruptive Agitation in Alzheimer's Disease (PEACE-AD) is a Phase IIb multicenter, randomized, double-blind, placebo-controlled trial of 12-weeks treatment with the brain active alpha-1 adrenoreceptor (AR) antagonist prazosin for disruptive agitation defined as having at least one of any of the following target behaviors with ≥ moderately severe rating at least 5 times per week for a minimum of 4 weeks: a) irritability, b) physically and/or verbally aggressive behavior, c) physically resistive to necessary care, d) and/or pressured motor activity (e.g., pressured pacing) in approximately 186 Alzheimer's disease (AD) residents in long-term care (LTC) settings. LTC is defined as assisted living or skilled nursing facility. A previous single site pilot study addressing disruptive agitation in 22 predominantly LTC-residing AD participants demonstrated efficacy of prazosin on all three primary outcome measures.1 The current multicenter study is funded by the National Institute on Aging (NIA), and coordinated through the NIA-funded Alzheimer's Disease Cooperative Study (ADCS).


Alzheimer's Disease Disruptive Behavior Dementia Agitation PEACE-AD Alzheimer Disease Psychomotor Agitation Problem Behavior Prazosin


You can join if…

  1. Males and females with probable or possible AD by NINCDS-ADRDA criteria utilizing medical history; medical records review; physical, neurological, and psychiatric exam; and screening laboratory tests, who are residing in a LTC facility. Brain imaging is not a requirement.
  2. At Baseline (BL), participants must have disruptive agitation (documented on the Behavioral Inclusion Criteria Checklist and detailed on the ADCS-CGIC-A BL Worksheet) defined as having at least one of the following target behaviors with > moderately severe rating at least 5 times per week for a minimum duration of 4 weeks: a) irritability, b) physically and/or verbally aggressive behavior, c) physically resistive to necessary care, and/or d) pressured motor activity (e.g., pressured pacing). These behaviors must be problematic in that they cause participant and caregiver distress and/or interfere with essential care or disrupt the LTC environment. Target behaviors may be any combination of the listed domains, as long as there are 5 or more instances per week of at least moderate severity.
  3. Psychotropic medication, if used, should be stable for at least 2 weeks prior to randomization.
  4. If taking cholinesterase inhibitor and/or memantine, must be on stable dose(s) for 3 months prior to randomization.
  5. Must be able to swallow capsules whole.

You CAN'T join if...

  1. History of schizophrenia, schizoaffective disorder, or bipolar disorder according to the criteria of the most current version of the Diagnostic and Statistical Manual of Mental Disorders (DSM).
  2. Other neurodegenerative diseases, including Parkinson's disease and Huntington's disease, or cerebral tumor.
  3. Dementia other than probable or possible AD per NINCDS-ADRDA criteria, such as human immunodeficiency virus (HIV) dementia, Creutzfeldt-Jakob disease, frontotemporal dementia, multiple cerebral infarctions, or normal pressure hydrocephalus.
  4. Current treatment for seizure disorder.
  5. Abnormal laboratory values with clinical significance in the opinion of the site Principal Investigator.
  6. Current unstable medical illness including delirium, worsening congestive heart failure, unstable angina, recent myocardial infarction (within the past 3 months), acute infectious disease, severe renal or hepatic failure, severe respiratory disease, metastatic cancer, or other conditions that, in the Site Principal Investigator's opinion, could interfere with the analyses of safety and efficacy in this study.
  7. Bedbound; participants may be ambulatory or use a wheelchair.
  8. Absence of any comprehensible language.
  9. Participation in another clinical trial for an investigational agent and took at least one dose of study drug (unless unblinded to placebo) within 12 weeks prior to screening. (The end of a previous investigational trial is defined as the date of the last dose of an investigational agent).
  10. . Preexisting recurrent hypotension (systolic blood pressure [BP] <110).
  11. . Preexisting orthostatic hypotension (>20 mmHg drop in systolic BP following 2 minutes of standing posture [or sitting if unable to stand], accompanied by dizziness, lightheadedness, or syncope).
  12. . A 2-week washout is required prior to BL for the following exclusionary medications: prazosin or other alpha-1 blocker, sildenafil, vardenafil, tadalafil, avanafil, and trazodone.
  13. . Women of childbearing potential (must be at least 2 years post-menopausal or surgically sterile for inclusion).
  14. . The participant may not be an immediate family member of personnel directly affiliated with this study, the study site or study funding agency. Immediate family member is defined as a spouse, parent, child, or sibling, any of whom may be related by blood, adoption, or marriage.
  15. . Participants whom the Site Principal Investigator deems to be otherwise unsuitable for participation.



  • University of California, San Diego (UCSD)
    San Diego California 92093 United States
  • University of Southern California
    Los Angeles California 90033 United States


in progress, not accepting new patients
Start Date
Completion Date
Alzheimer's Disease Cooperative Study (ADCS)
Phase 2
Study Type
Last Updated