A Study to Evaluate Efficacy and Safety of BAC in Patient With Alzheimer's Disease or Vascular Dementia

Inclusion Criteria

• With either gender aged at least 40 years old
• With a diagnosis of one of the following disease i. Vascular dementia according to the NINDS-AIREN International Workshop criteria or ii. Alzheimer's disease according to the NIAAA criteria iii. "Mixed" dementia (possible Alzheimer's disease with cerebrovascular disease) according to the NIAAA criteria

Note:

• NINDS-AIREN: National Institute of Neurological Disorders and Stroke and Association Internationale pour la Recherche et l'Enseignement en Neurosciences
• NIAAA: National Institute on Aging-Alzheimer's Association
• With mild-to-moderate dementia (score of the Mini-Mental State Examination (MMSE) defined as between 10 to 24 and score of ADAS-Cog as at least 12)
• Able to read, write, communicate, and understand cognitive testing instructions
• Having a responsible caregiver who spends at least 4 hours daily with the patient. The caregiver will accompany the patient to all study visits, , supervise administration of study drug, and be able to assess the patient's condition
• Patients and the responsible caregiver willing and able to provide written informed consent form

Exclusion Criteria

• With large vessel thrombosis (thrombotic stroke occurring in large arteries)
• With radiological evidence of other brain disorders (subdural hematoma, post-traumatic / post-surgery)
• With dementia caused by other brain diseases except Alzheimer's disease and vascular dementia (e.g. Parkinson's disease, demyelinated disease of the central nervous system, tumor, hydrocephalus, head injury, central nervous system infection including syphilis, acquired immune deficiency syndrome, etc.)
• With clinical evidence of pulmonary, hepatic, gastrointestinal, metabolic, endocrine or other life threatening diseases judged by investigators not suitable to enter the study
• With clinically unstable hypertension, diabetes mellitus, and cardiac disease for the last 3 months
• Ever hospitalized for stroke or with acute coronary syndrome in the previous 3 months prior to screening
• Drug or alcohol abuse within the previous 12 months of screening.
• With one of the following abnormal laboratory parameters: hemoglobin 3 months prior to baseline.
• Placement of an intrauterine device (IUD) or intrauterine system (IUS) > 3 months prior to baseline.
• Barrier methods of contraception: Condom or Occlusive cap (diaphragm or cervical/vault caps) with spermicidal foam/gel/film/cream/suppository
• Partner male sterilization (i.e., vasectomy) > 1 month of screening
• Enrollment in any investigational drug trial within 4 weeks of screening visit
• Experienced dosage increment of routinely use in drugs listed as follows within past three months before Screening visit
• medications/treatments for Alzheimer's disease or vascular dementia
• antipsychotic medications including but not limited to selective serotonin reuptake inhibitors (SSRIs), benzodiazepine (BZD)
• Vitamin B12
• drugs for thyroid disease
• Current antiplatelet drug (antiaggregant) except dosage including but not limited to aspirin <= 100mg/day, clopidogrel <= 75mg/day, ticagrelor <= 180mg/day, dipyridamole <= 400mg/day
• Caregivers who have psychotic symptoms, are imminently suicidal, have an unstable medical condition (e.g. recent heart attack, recent stroke, episodes of dizziness, fainting attacks) or significant orthopaedic problems.