Exclusion criteria:
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(1) Dementia of various causes, including AD, VaD, or other types of dementia, that have met the DSM-IV diagnostic criteria for dementia, such as Parkinson's disease, Huntington's disease, normal pressure hydrocephalus, brain tumors, progressive supranuclear palsy, epilepsy, chronic hard sub-membrane hematoma and multiple sclerosis, with a history of severe head trauma with persistent neurological deficits or known brain structural abnormalities;
(2) Sleep disorders that may affect cognitive performance, drug or alcohol abuse or dependence in the previous 5 years, and other can interfere with factors that affect cognitive performance such as depression (HAMD> 12 points) or mental disorders;
(3) CT or MRI scans in the past 12 months show central nervous system infection, infarction, and other focal damage;
Heikinski Ischemic Scale (HIS)> 4 points;
(4) Other conditions that should not be participated in this study, such as hypertension emergency, hypertension crisis, and drug taking controlled hypertension, severe arrhythmia, or cardiac function grade 3-4, or myocardial infarction occurred within 3 months before participating in the trial, etc .;
(5) Chinese medicine, anticholinergic, anticonvulsant, antiparkinsonian, excitatory, cholinergic, antipsychotic, or anticholinergic or cholinergic antidepressant or anxiolytic of patients, known to be allergic to this medicine;
(6) Severe liver and kidney dysfunction, such as ALT or AST above 1.5 times the normal value, or the upper limit of serum Cr normal value;
(7) Severe asthma and chronic obstructive pulmonary disease;
(8) Patients with severe indigestion, gastrointestinal obstruction, gastric or duodenal ulcers;
(9) Those who are participating in other clinical trials;
(10) Subjects that the investigator believes cannot follow the study procedure.
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