Study to Examine the Safety and Efficacy of Pimavanserin for the Treatment of Agitation and Aggression in Alzheimer's Disease (SERENE)

Inclusion Criteria:

1. Male or female, 50 years of age or older

2. Can understand the nature of the trial and protocol requirements and provide signed
informed consent

- from patient, if deemed competent to provide consent

- from an appropriate person (e.g. patient's Legally Authorized Representative
(LAR) with the patient's assent) if patient is deemed not competent to provide
informed consent.

3. Has a diagnosis of probable AD according to the National Institute on
Aging-Alzheimer's Association (NIA-AA) guidelines

4. Meets criteria for agitation according to the International Psychogeriatric
Association (IPA) guidelines

5. Lives at home or in an assisted living or care facility (but has the capacity to visit
the clinic as an outpatient). Subjects must have been at their current location for at
least 3 weeks prior to Screening and plan to remain at the same location for the
duration of the trial.

6. Has a designated study partner/caregiver who is in contact with the patient at least 3
times a week on 3 separate days

7. Female patients must be of non-childbearing potential or must agree to use an
acceptable method of contraception or abstinence , for at least 1 month prior to
randomization, during the study, and 1 month following completion of the study

8. The patient and caregiver are willing and able to participate in all schedule
evaluations and complete all required tests

Exclusion Criteria:

1. The agitation/aggression is attributable to concomitant medications, environmental
conditions, substance abuse, or active medical or psychiatric condition

2. Patient is receiving skilled nursing care for any medical condition other than
dementia

3. Treatment with an antipsychotic medication within 2 weeks of Baseline visit or 5 half
lives, whichever is longer

4. Patient or study partner/caregiver has a medical condition (e.g., hearing, vision
impairments) that would impair the ability to perform the study assessments.

5. Has had a myocardial infarction within the last six months

6. Has a history or symptoms of long QT syndrome

7. Has a history of a significant psychotic disorder before or during the diagnosis of
probable Alzheimer's disease (including, but not limited to schizophrenia or bipolar
disorder)

8. Patient is bedridden or has any significant medical condition that is unstable and
would place the patient at undue risk from study drug or study procedures 9. Has a
sensitivity to pimavanserin or its excipients

10. Has previously participated in a clinical study with pimavanserin

11. Has a Global Clinician Assessment of Suicidality (GCAS) score of 3 or 4 based on
Investigator's assessment of behavior within the last 3 months at Screening or since last
visit at Baseline