Efficacy and Safety Study of Shenwu Capsule

Inclusion Criteria: * Chinese-speaking adults at least 55 to 80 years of age old, weighting between 45 to 90 kilograms, living in the community. * diagnosed with amnestic MCI at screening: (1) memory complaint, corroborated by an informant; (2) abnormal memory function, as screened by the WMS-R Logical Memory II Delayed Story Recall subtest score \<10.4 for age; (3) normal general cognitive function, as determined by a clinician's judgment based on a structured interview with the patients (MMSE of 24 to 30 score for education ); (4) no or minimal impairment in activities of daily living, as determined by a clinical interview with the patient and informant (IADL \<16 score); and (5) not sufficiently impaired, cognitively and functionally, to meet NINCDS-ADRDA criteria for AD, as judged by an experienced AD research clinician. In addition, they were judged to be at stage 2-3 of the GDS, and to have a score of ≤12 of the HAMD for 17 items, of ≤4 on the HIS, and no or minimal medial temporal atrophy (MTA) or hippocampal volume atrophy on the MRI scan. * The subjects required adequate vision and hearing to participate in study assessments. Patients receiving chronic aspirin therapy for cardio-protection (≤100 mg per day) or stable doses of antidepressants for at least 3 months were also eligible. Exclusion Criteria: * Significant neurologic disease that might affect cognition, such as a diagnosis of Alzheimer's disease, stroke, Parkinson's disease, multiple sclerosis, or severe head injury with loss of consciousness; a score of MMSE\<24,or any major psychiatric disorder (e.g., DSM-IV-defined psychosis, major depression, bipolar disorder, or alcohol or substance abuse); * Recent history of chronic use of NSAIDs or aspirin (\>100 mg per day); * History of upper gastrointestinal bleeding that required transfusion or surgery within the previous 3 years,or documented evidence of an active gastric or duodenal ulcer within the previous 3 months,or history of NSAID-associated ulcers; * History of active malignancy except for basal cell carcinoma or squamous cell carcinoma of the skin, or prostate cancer, within the preceding 24 months; * A chronic or acute renal, hepatic, or metabolic disorder; and uncontrolled hypertension and diabetes mellitus; * History of hypersensitivity to the treatment drugs; or concomitant drugs (including anticonvulsant agents, anti-parkinsonian agents, antipsychotics, anxiolytics, hypnotic agents, neuroleptic agents, cholinomimetic agents, vitamin E, or ginkgo biloba extract or any other drugs including traditional Chinese herbal medicines which can affect memory); or participants in other clinical studies within the past 30 days.