The life expectancy of Alzheimer’s disease in the middle stage of life is about 3~10 years, and a few patients can survive for 10 years or even longer, which is mainly related to the patient’s nursing care and the control of related complications. The vast majority of patients with dementia die from complications such as lung infection, urinary tract infection, malnutrition and bedsores. Effective nursing care can significantly reduce the probability of complications, thus prolonging the patient’s life and improving the patient’s quality of life. In addition to nursing care, medication also has a role in slowing down the progression of dementia. Drugs that improve cognitive function include cholinesterase inhibitors, such as donepezil, and NMDA receptor antagonists, such as memantine, etc., but there are no drugs that can effectively reverse the progression of dementia.