The Clinical Trial of Chinese Herbal Medicine (SaiLuoTong) Capsule

Inclusion Criteria:

• 40 years≤Age≤75 years, female or male.

• With an education at more than (including) 6 years.

• Meet the diagnostic criteria for dementia in Diagnostic and Statistical Manual ofMental Disorders-5th Edition (DSM-V).

• Meet the National Institute of Neurological Disorders and Stroke-AssociationInternationale pour la Recherche etl'Enseignement en Neurosciences(NINDS-AIREN)Criteria of Probable Vascular Dementia (1993).

• MRI (magnetic resonance imaging) supports the presence of ischemic cerebrovasculardisease, and meets NINDS-AIREN Imaging Criteria; the diameter of each infarct≤ 30mm(And the perivascular spaces and cerebral microbleeds were excluded).

• Modified Hachinski Ischemic (mHIS) Scale ≥ 4.

• Hamilton depression scale (HAMD) ≤ 17.

• Patients with mild or moderate VaD: 10 ≤ MMSE ≤ 26 and 1 ≤ CDR ≤ 2.

• Willing to participate in this study and could sign the informed consent form byhim/herself and lawful guardian prior to the study.

• The subjects must have a care giver who are cognitively normal (MMSE scores:illiteracy> 17 points, 1 - 6 years of education > 20 points, 7 years and above ofeducation > 24 points). The care giver shall also be able to take care of thepatient at least 4 days a week for more than 4 hours a day while he or she canaccompany the subjects to attend each visit. During the trial, a new caregiver musthave MMSE score and the results would be presented in forms of subjects in theattachment.

Exclusion Criteria:

• Patients with dementia caused by a brain disease other than VaD (such as Alzheimer'sdisease, dementia with Lewy bodies, frontotemporal dementia, Parkinson's disease,central nervous system demyelinative diseases, tumour, hydrocephalus, trauma,central nervous system infection, such as syphilis, AIDS and Creutzfeldt-Jakobdisease);

• Patients with serious neurological impairment to finish the examination: handhemiplegia, aphasia, and visual or hearing impairment.

• Laboratory anomalies: hemoglobin (Hb) level less than 80g/L , platelet count (Plt)level less than 50×109/L, activated partial thromboplastin time (APTT) exceeds 2.5times the normal upper level, fibrinogen(FIB) level less than 0.5g/L, prothrombintime (PT) exceeds 2.5 times the normal upper level, Serum creatinine (Scr) exceeds 3times the normal upper level, alanine aminotransferase (ALT) exceed 5 times thenormal upper level , aspartate aminotransferase (AST) exceed 5 times the normalupper level, alkaline phosphates (ALP) exceed 5 times the normal upper level , γ-glutamyl transferase (γ-GT) exceed 5 times the normal upper level, total bilirubin (TBiL) exceeds 3 times the normal upper level.

• The subjects have nutritional and metabolic diseases and endocrine system diseasesthat cannot been controlled by therapy - thyroid diseases, parathyroid disease,vitamin or element deficiency.

• Patients with serious circulatory system diseases, respiratory system diseases,urinary system diseases, digestive system diseases, haemopoietic system diseases (such as unstable angina, uncontrollable asthma and active gastrorrhagia) andcancer.

• Serious mental disease (such as depression and schizophrenia) and epilepsy.

• Gastrointestinal diseases that may affect the absorption, distribution, andmetabolism of the investigational drug.

• Alcohol and drug abuse.

• Patients who have been given any drug that can affect the cognitive function (including Chinese herbal preparations containing any one of these: ginseng, ginkgoleaf, and saffron; Western medicines such as donepezil, karbalatine, rivastigmine,huperzine a, memantine and similar drugs, etc; Butylphthalide and other drugs withthe same effect such as runeirergine, aniracetam, cytosporine, dihydroergine,nimodipine, etc) within one month before the start of this study and cannot bediscontinued.

• Patients who are allergic to more than 2 drugs or any component of the SLT capsules.

• Pregnant or lactating women.

• Patients who have participated in other clinical studies within 3 months prior tothis study.

• Cannot accept magnetic resonance imaging (MRI) examination.